stern thruster for sailing yacht

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Everything you need to know about bow thrusters & stern thrusters

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As the name suggests a bow thruster or stern thruster is a means of propelling a boat sideways, usually to help with manoeuvring into a berth

Bow thrusters or stern thrusters are mostly fitted at the bow and/or stern of a yacht, so the skipper can push one or both ends towards or away from the dock.

They are particularly useful when trying to counter a strong side wind or current that is making it hard to control the boat. They can also help you slot into a short berth or when your close-quarters control is compromised by steering or engine failure.

Bow or stern thruster?

Bow thrusters are more common than stern thrusters as the bow is more prone to being blown off course. This is because the stern is heavier and more deeply immersed due to the shape of the hull and location of the engines. You also have better control over the stern from the main engines and steering due to the location of the drives and/or rudders.

That said, stern thrusters are an increasingly common sight on displacement craft over 40ft, planing boats over 60ft and single-engined shaft drive craft of all sizes, which are notoriously hard to steer in astern due to the prop walk effect of a single large propeller. They are often fitted in addition to a bow thruster, as it allows you to manoeuvre both ends of the boat independently or together.

Most bow thrusters are installed in a tunnel through the hull just below the waterline

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How do they work.

The vast majority of them use one or two propellers set inside a tube, which are powered by either an electric or hydraulic motor. Most bow thruster tubes are mounted through the hull just underneath the waterline. Most stern thrusters, on the other hand, are mounted outside the hull on the transom as close to the centreline as possible. There are a few exceptions, such as water jet thrusters, which use high-pressure jets instead of propellers, externally mounted ‘torpedo’ thrusters and retractable thrusters which retract inside the hull when not in use.

What type do I need?

That depends on the size and drivetrain of your boat. For craft up to 40ft, an electric tube bow thruster is likely to be the most affordable option and good enough for the task in hand, provided you only use it in relatively short bursts.

Electric bow thrusters come in a variety of sizes, power ratings and voltages (12V and 24V DC and 250V AC). Speak to your local installer and study the manufacturers’ specs to see what’s right for your boat, but if in doubt, go for a size larger than specified. Too much power is easy to deal with. Not enough power is a waste of money.

Here, a bow thruster is being used to push the bow of the boat away from the pontoon

The disadvantage of a basic electric thruster is that they are prone to overheating and cutting out when used continuously for more than a few seconds. They are also either on or off – you can’t vary the amount of power.

For smaller displacement craft, such as river launches and sailing boats, an externally mounted thruster can also be an effective low-cost solution. In this instance the motor and propeller are fitted inside a single waterproof hydrodynamically shaped pod that is mounted underneath the hull so all you have to do is fix it to the hull and drill a small hole for the wiring.

Above 40ft it’s worth considering something more powerful with superior control, such as a proportional or hydraulic thruster.

Stern thrusters tend to be mounted outside the hull on the transom

What’s a proportional thruster?

Essentially, it’s a thruster with an electronic throttle that allows you to vary the amount of power it produces. The further you push the lever over to one side the more speed/thrust it delivers. Not only does this give you finer control over the boat, minimising unwanted noise and disturbance, but it means you can run the thruster for longer at reduced power without it cutting out.

This can be particularly useful when pinning a boat against a dock while you attach the lines – some proportional thrusters have a hold button specifically for this purpose.

What about hydraulic bow thruster or stern thrusters?

Hydraulic thrusters are driven by very high-pressure oil fed from a pump on the main engines or generator to a small hydraulic motor on the thruster. These are considered the gold standard of thrusters as they are usually more powerful and can run continuously at full power without overheating.

Torpedo-style thrusters are a cost effective solution for slow moving displacement craft

However, they require more space (for the oil tank and cooling) and are costlier to install because of the extra hardware and associated plumbing of high-pressure lines from the engineroom to the thruster(s). As a result they tend to be used on boats of 65ft-plus or those already fitted with other hydraulic items such as stabilisers, winches and cranes. If connected to the generator power take off, they also need an auto shut off for the generator’s electric output so the sudden load from a hydraulic pump doesn’t overload or stall the unit.

And water jet thrusters?

These have a powerful central water pump fitted inboard linked to four outlet nozzles located at each corner of the hull. This gives good control of both ends of the boat and is much quieter than a propeller system but is only really suitable for boats up to 30ft due to the limited power output.

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Why are propeller bow thruster or stern thruster so noisy.

Given that both electric and hydraulic motors are typically quiet in operation, it’s surprising how much noise most thrusters make. This is largely due to cavitation from the propeller tips. The small diameter and high speed of the propellers needed to push a heavy boat around creates low pressure spots on the tips that momentarily cause the water to vaporise into bubbles which then collapse, generating shock waves that resonate through the boat. The result is a rattling noise that sounds far worse than it is.

Most thrusters tend to be professionally installed such as this tidy-looking Sidepower stern thruster fitted by Sleipner dealer Osmotech UK

Can you make them quieter?

Up to a point. If you haven’t yet fitted one, go for the largest diameter tube possible, make the area around it as stiff as possible (to reduce structural-borne vibration) and try to encourage a smooth flow of water into the tube rather than sharp edges that increase the likelihood of cavitation. A proportional thruster can also reduce noise by giving you the option to run it slower for longer.

If you already have a bow thruster fitted, you may be able to swap the propeller for a modern composite low-noise, skew-tip design.

Are retractable thrusters a good idea?

Originally this was a big ship idea that has now moved down to the pleasure boat market. The idea is to reduce drag by bringing the unit up inside the hull when not in use to leave a flush surface. They are a little more complex to install because it involves cutting a hole in the centre of the hull, which is then likely to need additional reinforcement.

While this should reduce the amount of marine growth on the actual propellers, the retractable mechanism itself is prone to debris or marine growth. Having a retractable thruster jammed half open makes boat handling even more difficult.

A Vetus Pro thruster without the usual accompanying tunnel

Can you install a bow thruster or stern thruster yourself?

It’s possible but we wouldn’t advise it unless you really know what you’re doing. Most bow thrusters require you to drill a substantial horizontal hole through the bow below the waterline into which the thruster tube is inserted and bonded into place. This needs to be low enough to prevent the thruster from sucking in surface air when manoeuvering around a marina, but high enough for it to lift clear of the water when planing to minimise drag through the water.

Obviously this needs to be watertight and may require additional reinforcement due to weakening of the surrounding structure. Most boatbuilders now offer bow and/or stern thrusters as an optional factory fit extra on craft over 25ft long. This is such a popular option that some builders automatically fit a bow tube to every boat as standard but only cut the ends open and fit a thruster when the customer orders one.

What about electrical connections?

Electric DC thrusters need a very high instant current. For example, the smallest unit from Vetus needs 100A when operating, while a larger 8hp unit needs over 600A. The supply cables must be big enough to cope with the load while the distance from the battery to the motor should be kept as short as possible to minimise voltage drop. This often involves fitting separate thruster batteries close to the unit, which may affect your boat’s for and aft trim, not to mention a dedicated charger.

A Sleipner retractable thruster

Are there any other problems I should be aware of?

Most modern marine engines are computer-controlled with a “black brain box” controlling everything. Sudden voltage drops when an electric bow thruster is used can momentarily starve the power from the engine’s control system and cause it to stall. Precisely what you don’t need when berthing your boat!

The more advanced units have built-in inverters, which soften the electric surge by applying a proportional voltage for a few seconds. This may cause a minor delay between pushing the button and full thrust being delivered.

Thrusters are vulnerable to fouling growth and galvanic corrosion. Composite propellers and tubes can be coated with conventional copper-based antifouling paint but metal ones will require special propeller antifouling. Most thrusters have sacrificial anodes to prevent galvanic corrosion. This will need replacing at regular intervals depending on your area’s wear rate.

The exterior also needs filling and fairing so water can flow easily past the entry lip

What about hydraulic bow thruster or stern thruster installations?

A hydraulic thruster needs three high-pressure pipes connecting the oil pump on the main engines to the motor. I strongly advise fitting a hydraulic oil pump to each engine, connected with a splitter unit on the control valve chest. I have seen pumps fitted to just one engine, but invariably, if one engine fails or you get a rope around the propeller, it will be the engine with the pump. With a splitter unit fitted your thrusters will work using one engine only, just a little slower.

Remote handsets are particularly handy on larger boats where you may need to move away from the helm when coming alongside

How do you control them?

Most thruster controls are very simple. They normally have an on/off switch to power them up in readiness for docking and a port/starboard lever or pair of buttons to run them in the required direction. Proportional thrusters have a lever so that the further you push it the more power you get. Some units also have the option of a remote control enabling you to move around the boat when docking.

Joysticks can now be used to combine thrusters and engines for simple one-touch berthing control

How do joystick systems work?

Some bow and stern thrusters can now be linked to the steering and main engines using sophisticated software and a simple joystick control. All you have to do is push or twist the joystick in the direction you want to go and the computer will then decide what combination of thrusters, rudder position and engine drive is needed to move the boat in that direction. While not quite as effective as steerable pods, this does make a shaftdrive boat almost as easy to park as an IPS one.

Thrusters take the stress out of manoeuvring in tight spaces

What future developments should I be aware of?

Many joystick systems now have a skyhook or station hold button that keeps the boat locked in position using GPS location and the boats’ engines and thrusters to prevent it drifting. A number of electronics manufacturers also offer varying degrees of berthing assistance using cameras and proximity sensors in conjunction with joystick control. At some point, full automated berthing is also likely to happen. In all cases thrusters will play a key role in making this possible.

Which make of bow thruster or stern thruster should I opt for?

As always, that comes down to price, your boat’s requirements, local availability and personal preference. Sleipner (Sidepower), Vetus, Quick and Lewmar are the main players in Europe. Based on the boats we test, we’d say Sleipner thrusters are the most popular factory-fitted option.

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Precision Maneuvering

Next-generation bow or stern thruster, effortless installation, no fiberglass needed.

Say goodbye to complex fiberglass work! Our corrosion-resistant composite and stainless steel thru-hull parts make installation simple for any technician.

No Moving Parts, Maximum Durability

With no moving parts below the waterline, Jet Thrusters eliminate propeller damage and gear failures. Safe, reliable, and perfect for long-term performance in any condition.

Low Maintenance,

High reliability.

Designed with fewer moving parts, Jet Thrusters require less upkeep. Spend more time enjoying your boat and less time on maintenance—perfect for long-term reliability.

Jet Thruster Combi: Bow and Stern Thrusters in One

Enjoy full control from both bow and stern. A single investment in our Jet Thruster Combi provides seamless maneuverability, making docking and navigating a breeze.

Our Main Products

Explore our range of Jet Thrusters, designed for optimal performance and easy installation,

whether you're outfitting a small boat or a larger vessel.

Single: Bow or Stern Thruster

30-90 kgf thrust for the bow or stern. 

One pump, two nozzles. Quiet and efficient control.

Combi: Bow and Stern Thruster

50-90 kgf thrust for both bow and stern. 

One pump, four nozzles. Total control in tight spaces.

Micro: Thruster for Small Boats

30 kgf thrust. 

Compact, easy DIY system with one pump and two nozzles.

What kind of boat do you have?

Steel motorboat - cruiser.

Steel Motorboat / Cruiser: Navigating Comfort with Control

Steel motorboats are a true Dutch classic, ideal for exploring the scenic waterways of the Netherlands. These robust and reliable boats have been popular for decades, offering comfort and reliability for those looking to enjoy nature from one mooring to another. However, there can be some stressful moments—waiting for bridges, controlling the boat in a lock, or maneuvering into a tight berth in a crowded marina.

Many of these boats are equipped with a traditional bow thruster—a tunnel welded into the bow, with a propeller prone to getting entangled with aquatic plants. Noise is also a known issue since the sound resonates strongly in a steel hull. However, these problems become a thing of the past with a Jet Thruster system.

Jet Thruster: Silent and Controlled Maneuvering

The Jet Thruster pump unit is installed centrally in the boat, typically under a seat or in the engine room. The key is to place the pump below the waterline. A minimum depth of 30 cm at the chosen location is required. Thanks to the flexible placement options, it is almost always possible to install a Jet Thruster.

A flexible, spiral-reinforced rubber hose connects the pump to either the bow or the stern. Near the bow or stern, a distribution valve—also known as a 3-way valve—directs the water flow to the port or starboard side, ensuring precise and efficient control.

Installation Options

After the distribution valve, the hose is connected to the nozzle. For steel boats, there is an option to weld in a steel nozzle, but you can also choose composite nozzles, available in six standard angles. The nozzle is installed 7 to 10 cm below the waterline, as far forward in the bow as possible, perpendicular to the boat’s centerline. Ensure that the nozzle is placed horizontally, although a slight downward angle of a few degrees is acceptable.

Once installed, the nozzle is fitted with a 2” stainless steel ball valve. The hose is connected to this ball valve. All components are robust, durable, and of industrial-grade quality. Despite the low system pressure (only 2 bar), we opt for heavy-duty materials to ensure longevity and reliability.

Flexible Solution for Every Type of Boat

he Jet Thruster system can be integrated in various ways: from the pump to the hose, distribution valve, and then to the nozzle (or through-hull fitting). There is no standard configuration, which is what makes the Jet Thruster system so adaptable. Even in existing boats or vessels with limited draft, the system can be installed. You can opt for just a bow or a combination of bow and stern systems.

If you already have a bow thruster but find a stern thruster difficult to install, the Jet Thruster offers the perfect solution. You can easily combine a Jet Thruster at the stern with your existing bow thruster. As long as the pump is below the waterline and the nozzles can be placed 7-10 cm under the water, the Jet Thruster is the ideal way to make docking and maneuvering a lot more relaxed.

Key Advantages of the Jet Thruster:

- No Clogging: No propeller to get caught in aquatic plants.

- Silent and Powerful: No resonating noise inside the hull.

- Flexible Installation: Suitable for both existing and new boats.

- Enhanced Control: Makes maneuvering easier, even in tight harbors.

- Peace of Mind: With the Jet Thruster, you can maneuver with confidence and enjoy your time on the water stress-free.

Fiberglass Sailboat 30-60ft

Polyester Sailing Yacht 30-60 Feet: Precision Control in Challenging Conditions

Since 2010, we have been producing and supplying Jet Thruster systems for almost every type of sailing yacht. Our systems are particularly suitable for yachts in the 30-60 foot range, even in high winds of Beaufort 5, 6, or 7. When wind speeds increase, a sailing yacht can quickly go off course, requiring more steering skill to safely maneuver in a marina. This is when a Jet Thruster becomes an indispensable tool.

While some shipyards offer bow thrusters as a factory option, many owners choose to install a Jet Thruster later due to the unique benefits our system provides.

Overcome Wind Challenges with a Jet Thruster

A Jet Thruster gives you precision control, even in high winds. Modern sailing yachts are often wider than classic designs, resulting in low draft in the forward section, making conventional bow thrusters difficult to install. Traditional bow thrusters require a minimum installation height of 1.5 times the diameter of the tunnel, which can lead to the propeller being placed too close to the keel, reducing its effectiveness.

No More Propeller-Related Issues

Unlike conventional bow thrusters, the Jet Thruster system uses small, efficient nozzles instead of large tunnels. This reduces drag during sailing and eliminates the risk of entangled ropes or plants. The system’s small nozzles can be placed far forward in the bow, optimizing the leverage effect compared to traditional solutions.

Key Benefits for Sailing Yachts:

- Optimized Weight Distribution: Components can be evenly distributed across the boat.

- Minimal Space Requirements: Ideal for modern designs with limited interior space.

- Superior Control: Perform precise maneuvers, even in tight marinas.

- No Propeller Noise: Smooth and quiet operation.

- In-Water Servicing: Can be serviced without lifting the boat out of the water.

With a Jet Thruster system, sailing becomes less about managing complications and more about enjoying the experience. It’s a high-performing, easy-to-install solution that adapts to a wide range of vessel designs.

Sloop (Polyester, Wood, Aluminum)

Sloops: The Ideal Solution for Tight Maneuvers

The sloop is a uniquely Dutch design, tailored for the intricate network of lakes, canals, and waterways throughout the Netherlands. Many owners value the ease of cruising on these stable boats, but even experienced boaters can face challenges. Flat-bottomed sloops with minimal draft can easily drift off course, especially at low speeds or in windy conditions, making docking a stressful endeavor. A Jet Thruster system provides an elegant solution, giving you full control during tight maneuvers.

Sloop Evolution: From Lifeboats to Modern Cruisers

Originally designed as robust lifeboats with basic handling capabilities, today’s sloops have evolved into luxury dayboats equipped with modern comforts. However, traditional handling issues persist due to their flat bottoms and shallow draft. This is where the Jet Thruster Micro comes into play, offering precise control and easy maneuverability in a compact package.

Jet Thruster Micro: The Perfect Fit for Small Boats

The Jet Thruster Micro is specifically designed for smaller boats and sloops. It’s compact, easy to install, and eliminates the need for complex fiberglass work associated with traditional bow thrusters. It provides maximum maneuverability without compromising the hull’s structure or aesthetics.

Quick and Easy Installation:

The Jet Thruster Micro is delivered as a complete installation kit, including all necessary components and a step-by-step guide. This makes it a perfect option for DIY enthusiasts or boat yards looking for an easy-to-install solution.

Why Choose the Jet Thruster Micro for Your Sloop?

- Compact and Efficient: Ideal for tight spaces and flat-bottomed boats.

- Minimal Installation Effort: No extensive fiberglass work required.

- Affordable Solution: Offers a significant performance boost without the high costs of traditional systems.

- Stress-Free Maneuvering: Gain full control in narrow waterways and crowded marinas.

With the Jet Thruster Micro, docking becomes a pleasure rather than a hassle, so you can enjoy your time on the water without worry.

Fiberglass Sport Boat - Day Cruiser

Sport Boats and Day Cruisers: Power and Precision Maneuvering

Whether you own a sleek Bayliner, a Sea Ray, or a Jeanneau Merry Fisher, having extra control while docking can make a big difference. Many polyester sport boats come equipped with a small bow thruster for tight docking maneuvers. But what about when you need more control in windy conditions or challenging situations? Adding a stern thruster can transform your boat’s handling, making it easier to steer even in the trickiest spots.

Add a Jet Thruster for Full Control

For sport boats, a Z-drive system helps with rudder control, but it often requires a lot of engine power. By adding a Jet Thruster system, you gain independent control over the bow and stern, making maneuvers simpler and more precise, especially in tight marinas.

Transom Nozzles: Tailored for Sport Boats

Our transom nozzles are specifically designed for stern installations, offering enhanced control at the rear of the boat. They are mounted on the transom and direct the water jets along the sides, providing a seamless solution for steering the stern in tight spots.

Benefits of Jet Thruster Nozzles for Sport Boats:

- Enhanced Control: Precise maneuvering for both bow and stern.

- Minimal Hull Modifications: Easy installation without large tunnel modifications.

- Fits in Tight Spaces: Can be mounted around existing equipment like Z-drives or trim tabs.

- Reliable Operation: Stainless steel components ensure durability and long-term performance.

With a Jet Thruster system, you can handle your sport boat with ease, whether you're docking in a tight marina or navigating through narrow channels.

Wooden Boats

Classic Wooden Boats: Modern Maneuvering Solutions

Owning a classic wooden boat is a source of pride and joy, but maneuvering can be a challenge without modern assistance. Wooden boats often require special care, especially during docking. That’s why many owners of iconic brands like Riva, Boesch, and Rio have chosen to install Jet Thruster systems, allowing them to maintain the beauty of their boat while adding state-of-the-art maneuverability.

Preserve Your Boat’s Classic Elegance

Traditional bow thrusters require large tunnels that can compromise the integrity and aesthetics of wooden hulls. The Jet Thruster system, on the other hand, uses small nozzles that are easy to install and preserve the boat’s original appearance.

Minimize Noise, Maximize Performance

Where conventional bow thrusters generate cavitation noise, the Jet Thruster operates quietly, ensuring that the tranquil experience of cruising in a wooden boat remains undisturbed. The system’s water pump design eliminates propeller cavitation, making it ideal for boats where silence is a priority.

Why Jet Thruster for Wooden Boats?

- Minimal Impact on Hull: Small nozzles minimize alterations to the boat’s structure.

- Silent Operation: No propeller noise or vibration.

- Flexible Installation: Adaptable to various hull shapes and designs.

- Preserve Authenticity: Maintain the boat’s classic look without large tunnels or intrusive components.

The Jet Thruster’s compact and flexible design allows for a respectful integration into even the most cherished wooden boats, combining the best of modern technology with classic craftsmanship.

Catamarans: Superior Control for Challenging Maneuvers

Catamarans have gained immense popularity in recent years, especially among charter companies in the Mediterranean. With their wide beams and large sail areas, catamarans can be tricky to control in windy conditions. The twin engines provide some maneuverability, but a Jet Thruster system can greatly enhance control, making docking easier even in crowded marinas.

Overcome Wind Challenges

Catamarans often have a large wind-catching surface, making them vulnerable to being pushed off course by gusts. A Jet Thruster system installed at the bow or stern provides precise control, allowing the captain to maintain the desired heading even in strong winds.

Compact Nozzle Design for Shallow Drafts

Traditional bow thrusters require deep tunnels, which are difficult to install on catamarans with shallow draft hulls. Jet Thruster nozzles are much smaller and can be installed just 7-10 cm below the waterline, providing effective thrust without the need for deep modifications.

Key Benefits for Catamarans:

- Precise Maneuvering: Handle strong winds and currents with ease.

- Minimal Resistance: No large tunnels to disrupt the boat’s hydrodynamics.

- Perfect for Shallow Drafts: Jet Thruster systems require only minimal draft.

- Multiple System Options: Choose from single, dual, or four-system configurations for maximum control.

Whether you’re maneuvering in a tight marina or anchoring in windy conditions, a Jet Thruster provides the confidence and control you need to navigate smoothly and safely.

Use our smart Thrust Calculator

Navigating your vessel should be effortless, even in the toughest conditions. Use our Jet Thruster Calculator to find the perfect system tailored to your boat’s size and needs. Boost precision, simplify docking, and enjoy smooth sailing with the right Jet Thruster solution.

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We appreciate your interest in Jet Thruster systems. Our team is reviewing your information and will respond shortly with the best solution for your needs. 

In the meantime, feel free to explore our Estore for more details on our products.

Jet Thruster explained

Check out our distributor Jim Oates from Jet Thruster America as he demonstrates how the Jet Thruster system enhances docking, providing superior control even in the tightest spaces. See for yourself how it transforms the boating experience!

More information and inspiration

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We’ll feature the photos on our website, and at the end of the 2024 season, one lucky winner will receive a Jet Thruster Mystery Box – including custom Dutch Wooden Shoes!

Show your Jet Thruster pride and enter today!

Jet Thruster Nozzle explained:

A Jet Thruster utilizes composite thru-hull nozzles to expel water at high velocity, creating thrust that allows precise and effective maneuvering of your boat.

- Suitable for shallow draft vessels (with nozzle positioned just 10cm below the waterline),

- minimal hull penetration,

- virtually no noticeable drag,

- operates without any moving parts.

Suitable for boats from 25-60ft

The Official Jet Thruster Manufacturer Website Copyright  2010-2024

Jet Thruster is a product of:

Holland marine parts b.v., visiting / delivery / return address:, holland marine parts:, street: donker duyvisweg 297, zip code: 3316 bl, city: dordrecht , country: the netherlands, phone: +31786174968, c.o.c. dordrecht: 50356801, vat: nl822692594b01, bank info for payments (always mention invoice number), iban: nl93rabo 0114 98 3151, bic: rabonl2u.

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Contact info, +31 78 617 4968, [email protected].

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Installing a Stern Thruster

• By Joe Friedman
• Updated: July 6, 2007

Dan wanted a bow thruster to make close-quarter maneuvering easier on his inboard cruiser. But, like most of us, he didn’t have the nerve to cut a large complicated hole below the waterline nor the professional fiberglassing expertise needed for the job. His other option? An electric stern thruster, which is easy to install on a flat transom, and well within the skills of any do-it-yourselfer. He bought one from Vetus (410/712-0740, www.vetus.nl). The thruster’s joystick control, wiring, and prop/tunnel are all stock, but there are many choices for the electric motor. Vetus helped with this over the phone, as well as with installation questions as the unit’s manual isn’t all that good. The only major complication encountered was that the thruster requires a dedicated 12-volt battery be wired into the boat’s DC charging system.

Parts Electric motor (ignition protected) Vetus BOW55121, $3,000 Prop/tunnel Vetus Stern 150P, $412 Joystick control Vetus Model BPJE, $273 Fuse holder Vetus ZEHC100, $45 250-amp fuse Vetus ZE250, $16 Wiring harness (33′) Vetus BP2910, $66 12-volt battery 100-to-200-amp-hour

Supplies • 3⁄8″ electric drill • 3⁄8″, 1⁄2″ drill bits • 3″ hole saw • Jigsaw • (2) 5⁄8″ wrenches • 3⁄8″ stainless-steel hex bolts, washers • Outboard motor gear grease • Sikaflex 292 sealant (or equivalent) • Cable ties and clamps • AWG 000 cable • Solderless ring terminals • Heat-shrink tubing • Heat gun

Installation Locate the athwartship center of the transom and draw a vertical line. Tape the thrust tunnel’s paper mounting template to the transom. Be sure to line up the template’s “waterline” to your boat’s actual waterline, not the painted one. Check and double-check this. It is essential that the thruster’s tunnel is parallel to the water’s surface.

Before drilling any holes, check inside the boat to be sure that there are no obstructions and that there is a minimum of 1′ of clearance to accommodate the internally mounted motor. Also be sure that no bilge water can reach the installed motor.

Drill six 3⁄8″ holes for the thrust tunnel’s mounting bolts. Next, drill a ½” pilot hole for the jigsaw’s blade and cut a 6½” hole for the motor mount. De-bur fiberglass edges with fine grit sandpaper.

Mount the thruster tunnel to the transom using generous amounts of sealant on both sides of its gasket. Before securing the tunnel, coat the threads on its nuts and bolts with grease to prevent them from seizing in place. Push bolts out from inside the hull, keeping the nuts and lock washers on the outside. Check that the prop still clears the thrust tunnel by a minimum of 1⁄16″.

Mount the motor using its four bolts, applying generous amounts of sealant around its mounting flange. Be sure to grease the nuts and bolts. Before final tightening, spin the prop by hand to be sure it turns easily.

The motor is now hanging by its mounting bolts, which will overstress the transom and mounting flange unless the weight of the motor is supported. We fiberglassed in a wood bracket with a block and shims under the motor. Locate a convenient place at the helm station for the joystick. Be sure that there is rear access and at least 5″ of clearance. Drill a 3″ hole, then slip on the supplied foam gasket and mount. If the location is exposed to the weather, additional sealant is recommended. Connect the joystick to the motor with the wiring harness, supporting the run at least every 1’6″.

Wiring Install a dedicated 12-volt battery as close to the thruster’s motor as possible. Mount the 250-amp fuse holder between the battery and the motor. Remove the motor’s cover to expose the positive terminal. Run a length of red AWG 000 cable from the battery’s positive terminal to the fuse holder and another length from the fuse to the motor. Run yellow AWG 000 cable from the battery’s negative terminal battery to the motor. Use crimped ring terminals with heat-shrink tubing.

Watch Your Trim This system weighs a hefty 44 pounds, plus the additional nearby battery. This much weight concentrated at the transom can affect your trim. Check your painted boot stripe after the installation.

What’s a Waterline? When placing the template on the waterline, be sure to use the actual waterline, not the boot stripe. The actual waterline is the scum mark left on the transom after sitting in the water for a season.

Paint? Do not paint the prop. It is finely machined and balanced and will clean itself every time it is activated. The thruster tunnel is fiberglass and must be painted.

Charge It When installing the dedicated battery, be sure to wire it into a charging source. No charge, no thrust.

Dedicated Battery • Deep-cycle battery in covered box with external strapping with no more than 1″ movement in any direction. • Cover the positive terminal with cable cap. • Keep out of areas that exceed 1200F. • Never put above a fuel tank, fuel filter, or fuel line fitting. • Any metallic fuel system component within a foot must be electrically insulated.

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Thruster Systems

Thrusters can take the stress out of docking by giving you sideways control of the movement and position of the bow and the stern of your boat. They work by rotating a propeller in a submerged tunnel or a housing mounted athwartships and located near the bow and/or the stern. A control panel allows you to push the bow and/or stern sideways, to resist the force of a crosswind and cross-current, while you are manoeuvring in close quarters.

What thrusters will do for you and your boat

• Allow you to maintain control while docking and manoeuvring, even into a very tight slip in a crowded marina
• Allow a single crew member to pick up and secure the dock lines while you move the boat sideways from one piling or mooring buoy to the next - slowly, carefully, quietly and with very little pushing, pulling or shouting
• Allow you and your one-person crew to handle and control a much bigger and more comfortable boat
• Avoid the possibility of hitting another boat, a dock or a piling and causing expensive damage to your boat, another boat or the marina facilities
• Minimize the risk of a crew member being injured during docking manoueuvres in difficult conditions
• Allow you to handle your boat with the same expertise, grace and panache as the other captains whose boats are equipped with VETUS thrusters

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Pros and cons of different marine thruster solutions

By Runar Scott Jensen 29. May 2019

Boats come in many different shapes and sizes. There are now bow and stern thruster solutions for virtually every type of motor boat and sailing yacht ever produced. 

Traditional thrusters continue to dominate the market.

These solutions aren't just for plastic moulded hulls. Today you'll find solutions for both wooden, steel, aluminium and carbon-fibre hulls with every kind of external design, keel arrangement and internal layout configuration imaginable. 

Within this article we will take a look at the following thruster types:

1. Side propeller for tunnel installation 2. Retractable (folding) side propeller 3. Externally mounted side propeller  

Side propeller for tunnel installation

For the widest possible choice of sideways thrust available, look no further than for a well-made and professionally installed tunnel thruster.  

Main thing to think about is having enough internal volume and bow / stern access for correct installation inside your boat. There is no room for making a miscalculated error here because the position of the submerged tunnel in relation to the waterline above is critical for optimizing both thruster performance and in the reduction of noise.    

Today’s tunnel thruster choices are amazing and if you choose your manufacturer wisely, your system can be upgraded to proportional control , letting you control your thrusters in much the same way as you would use the gas pedal on a car.

Read more:  How much power do I need from my bow and stern thruster installations? →

Instead of a full-power on/full-power off, Proportional Control lets you carefully feed in just the right amount of sideways thrust required for the circumstances prevailing, giving you total close quarters manoeuvrability and full, single-handed control.   

• Solid and well-proven construction with few moving parts.
• Wide choice available.
• Comparatively high value for money versus other types.
• Can help to stiffen and add structural integrity to a hull.
• Troubleshooting and maintenance without lifting the boat.
• Some systems available with ignition protection and protection from water ingress.
• No reduction in boat speed when the tunnel is correctly installed.
• Complex installation so professional fitment is strongly preferred.
• Requires sufficient internal space to fit.
• Tunnel must be located a minimum of ½ to 1 times its diameter beneath the waterline.
• Some noise emission possible unless the tunnel is optimally installed.

   

Retractable (folding) side propeller

Retractable thrusters that can be placed in either bow or stern locations at the furthest most extremities of a hull are becoming more and more popular.   The discreet nature of fully retractable thrusters lends themselves perfectly within the large, bespoke yacht and super-yacht community.  

By using single or twin actuators for fast deployment times, the propellers used in retractable thrusters are housed within shorter length tunnels compared to standard tunnel installations.

The best solutions on the market have protection against running aground, using so-called breakpoints. Breakpoints work by releasing the tunnel if a boat were to run aground with the tunnel deployed so that the integrity of the hull is not jeopardized.

Read more: How to reduce noise from your bow thruster →

Shorter tunnels are comparatively more efficient and less noisy. They suffer less from cavitation caused by larger width tunnels, or tunnels that have been poorly installed by not rounding off and fairing in the ends where they meet the hull sides.  

• Perfect for flat-bottomed sailing yachts.
• Can be used as a stern propeller for boats that cannot mount an external thruster on the stern.
• Highly efficient thrust as they can usually be mounted with good depth and far into the boat using a shorter length tunnel.
• Often low or zero noise as the vibration energy does not easily propagate to the hull.
• Can be made available with Proportional Control.

Cons:  

• More involved construction compared to other types.
• Larger internal footprint compared to size of tunnel.
• Some delay while the tunnel is being deployed.
• More vulnerable to damage due to the external protrusion.

Externally mounted side propeller

Coming in different shapes and sizes, but with the most common types being torpedo-shaped solutions mounted underneath a boat’s hull.   These streamlined pods are perfect for boats that have very little internal space, or for owners of smaller, less expensive crafts who might struggle to justify the cost of installing a ‘full-fat’ tunnel or retractable thruster.     

With the propeller and electric motor contained together inside a hydrodynamic housing, any concept of drag is barely noticeable and drilling small holes for the mounting shaft and internal cabling is a quicker, less costly and more convenient process than for all other alternatives.

Read more: How to choose the best thruster brand for your boat →

And due to their positioning at the outermost extremities of a hull, exterior mounted thrusters benefit greatly from an increased leverage arm in relation to the pivot point on a boat’s hull. This means although these units may generally be smaller in size and with less available thrust power, their greater efficiency means they are able to move larger size boats by requiring nominally less power than conventional thrusters.

As the name suggests, the only negative aspect to think about is that if you regularly launch and recover your boat using a trailer, or if you store your boat ashore on a raised stack system, you will need to bear in mind there’s now an additional appendage protruding from the lower half of your hull.

• Requires minimal interior space in a boat.
• Easier and faster to install and perfect for retro-fit.
• Higher efficiency due to optimum positioning.
• Quiet operation in majority of cases.
• Long run-time due to effective water cooling of the motor.
• Small footprint on the stern area surface.
• Not recommended for planing hulls.
• Some negative effects of increased water resistance and associated drag.
• Care required when lifting the hull out, re-launching or storing ashore.

With the different thruster options available today, boat owners have a far wider choice than ever before. Seldom does the 'one boat, one rule' system need to apply. 

Topics: Thruster - Leisure , thrusters , hull design , bow thruster , stern thruster , Marine Thrusters , Boat Owners

By: Runar Scott Jensen

Runar Scott Jensen has been in the marine business for more than 22 years and has a broad experience with technical equipment. Runar holds the position of Norwegian Sales Director at Sleipner Motor. Like many other employees at Sleipner, Runar is often at sea himself, learning firsthand the importance of reliability while boating.

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bow thruster Vertical

Power : 8 kW - 56 kW Thrust : 160 kgf - 750 kgf

... particularly when mooring ‘ stern to’. Lewmar Custom Thrusters can help provide additional control just when you need it, at the touch of a button or the move of a joystick. ■ Suitable for vessels up ...

stern thruster 140TT series

Power : 2.2, 2 kW Thrust : 37, 42 kgf

No reservoir to install, no leaks and no maintenance High performance 5 blade propellers give equal thrust in both directions High integrity seal Spline driven propeller, no drive pin required Black box electronics ...

bow thruster 185TT series

Power : 3, 4, 5, 6 kW Thrust : 58, 65, 82, 97 kgf

No reservoir to install, no leaks and no maintenance High performance 5 blade propellers give equal thrust in both directions High integrity seal Spline driven propeller, no drive pin required Black box electronics prevents misuse ...

azimuth thruster Stern

Power : 180 kW - 1,200 kW

Flexible in use, easy installation at the stern of the vessel Azimuth Thrusters combine propulsion and steering in one propulsion package. Offering steerable thrust in all directions, ZF Azimuth Thrusters ...

fixed thruster DH_Double PP

Power : 42, 25, 31 ch Thrust : 300, 400, 330 kgf Thruster diameter : 320 mm

... Suitable for vessels required high-thrust with low hull – Aquaculture vessels, Purse seiners(Astern) Standard supply – Thruster including hydraulic motor

bow thruster E series

Power : 5.1 W - 15 W Thrust : 127.5 daN Inner tunnel diameter : 250, 339 mm

... efficiency. Some thruster models even see an increase in thrust power. The expected noise reduction in average installations: 20-40% Upgrade kits are available for most Sleipner thruster models with ...

bow thruster BWT/E

Power : 22 kW - 500 kW Thrust : 2 kN - 63 kN Thruster diameter : 400, 1,400 mm

YMV manufactures tailor made bow thruster , stern thruster for ships, tugboats and megayachts. YMV Tunnel thrusters support the mooring or harbour operations and extends ...

bow thruster BT/H-

Power : 22 kW - 500 kW Thruster diameter : 400, 1,400 mm Tunnel length : 1,500, 1,000 mm

bow thruster BWT/E-C

Power : 22 kW - 1,000 kW Thruster diameter : 400, 1,400 mm Tunnel length : 1,000 mm

stern thruster RST-110

Power : 110 ch Inner tunnel diameter : 24 in Tunnel length : 800 mm

Introducing our premium Retractable Stern Thruster , a hydraulically driven thruster designed for compact vessels requiring reliable and smooth bi-directional side thrust. This thruster ...

bow thruster WS-JTCH-50-24/48V

Power : 6 kW Thrust : 50 kgf

Jet Thruster JT50 Bow and Stern (Horizontal pump) Jet Thruster is the most flexible and technical advanced Bow or Stern Thruster on the market. With ...

bow thruster WS-JTSH-90-24/48V

Power : 15.5 kW Thrust : 90 kgf

Jet Thruster JT90 Bow or Stern (Horizontal pump) Jet Thruster is the most flexible and technical advanced Bow or Stern Thruster on the market. With ...

bow thruster WS-JTSH-30-12V

Power : 3 kW Thrust : 30 kgf

Jet Thruster JT30 Bow or Stern (Horizontal pump) Jet Thruster is the most flexible and technical advanced Bow or Stern Thruster on the market. With ...

azimuth thruster GPE series

Power : 20 kW - 500 kW

Italdraghe electrical azimuth thruster has been developed to be an outboard, steerable electric propulsion system for commercial vessels in inland and urban waterways. This electrical rudder propeller is designed to provide ...

bow thruster GP series

Italdraghe rudder propellers are large scale mobile outboard plants that provide the vessel with maximum manoeuvrability. The complete assembly is mounted on a fabricated steel chassis to form a self-contained propulsion unit for bolting ...

azimuth thruster GPI series

Power : 20 kW - 560 kW

bow thruster DUALIS ELECTRA

Power : 22 kW - 195 kW Thrust : 350 kgf - 3,150 kgf

... control panel is very compact, and it is available also in a version with a bow and stern thruster double joystick control. THRUSTER TUNNELS CMC Marine offers Thruster ...

bow thruster SE25

Power : 1.5 kW Thrust : 24.5 daN

The world’s leading series of bow and stern thrusters for leisure boats are the SE series from Side-Power. Side-Power offers the world’s largest range of DC thruster systems for leisure ...

bow thruster CT HYD 125

Power : 13.5, 11, 7.5 kW Thrust : 140, 90, 120 kgf Weight : 12 kg

... 125 is designed for motor yachts and deep footed sailing yachts ranging from 35-57. The smallest in the hydraulic tunnel thruster range, the twin propeller CT HYD 125 is fabricated using composite materials, has a 185mm ...

bow thruster

Power : 5 ch - 500 ch

WESMARs commercial line of robust counter-rotating dual propeller thrusters sets a high standard in the commercial bow thruster industry by bringing more power, less noise and less vibration than competitive ...

bow thruster KP 8 / KP 8E

Power : 8 ch

... designing and manufacturing rugged, dependable bow and stern thrusters for almost 40 years. From their origins, deeply rooted in the commercial markets of the Pacific Northwest, Keypower thrusters ...

Power : 50 kW - 1,160 kW

Jastram have been developing and producing transverse thrusters since 1950. Reliable gears, worldwide service, direct contact to our service department and detailed archived data for each delivered system are well accepted ...

bow thruster Swing

Power : 7.5 kW - 110 kW

... retractable (Swing) version. Swing bow & stern thrusters are mainly used on sailing boats for which the hull of the boat should be closed when the unit is not in use. While the yacht is manoeuvring, the ...

bow thruster CMT35S

Power : 35 kW - 150 kW Tunnel length : 379 mm - 1,037 mm

... dredging and operation under dynamic positioning, tunnel thrusters are a good technical and economical solution. Electric or hydraulic driven Tunnel thrusters positioned at the bow or stern ...

bow thruster TRAC

Power : 5.6, 7.5, 9 kW Thrust : 91, 129, 155 kgf

TRAC thrusters deliver more thrust per horsepower than any other thruster available. TRAC’s twin counterrotating propellers are more efficient and can reach higher horsepower than single prop thrusters . TRAC ...

fixed thruster TLCT80

Power : 35 kW - 650 kW Thrust : 5 kN - 102 kN

... Rotating Propeller Tunnel Thrusters are welded in transverse direction of the hull, available for Steel, FRP and Aluminium hulls. Thrustleader´s Contra Rotating Propeller Tunnel Thrusters can be installed ...

stern thruster ST340

Power : 5 ch

The ST340 Stern Thruster is made for all types of boats up to 45 feet in length Description: Stern Thruster 12 V DC, 550 Amps, Dual Prop, Aluminum Anodes Horsepower: ...

bow thruster Model 12 / 16 / 20 / 24

Power : 22 kW - 110 kW

... designed for the demanding commercial market, but now available for yacht applications, NAIAD Right Angle Bow Thrusters and Right Angle Stern Thrusters feature robust, heavy duty, matched ...

stern thruster QA 400 E

Power : 5 kW Thrust : 70 daN

​ Mounting only 80 mm below the waterline with only four screws Power supply through a hole of only 60 mm in the ship's hull Housing is made of solid aluminum, laminated and coated with antifouling Electric motor in a protected ...

stern thruster Barge Tsunami

Power : 75 kW - 224 kW

Bracket-Mounted Hydraulic Thrusters with Tillt (1800-11000 foot pounds of thrust) Versatile and powerful, these bracket-mounted marine thruster units are easily installed to accommodate both vessel ...

Power : 37 kW - 2,000 kW

Marine tunnel thruster , is also called side thruster , is a propulsion device installed at the bow or stern of a vessel to acquire latéral manoeuvrability. Some big vessels even has more ...

fixed thruster DT-0045

Power : 30 kW - 45 kW Thrust : 2.2 kN - 3.6 kN Inner tunnel diameter : 400 mm

Product: - - Tunnel thruster Manufacturer: - - DTG Propulsion BV, The Netherlands Step size: - - DT-0045 - - Typical application: - - Mega Yachts/ Commercial Vessels/ Navy & Coast guard Vessels / Offhore Vessels Typical ...

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Stern Thruster Fitting

• March 23rd, 2022
• Yacht Refit

Boats of 50 feet and more size, especially those ones sailed by a smaller crew, should be fitted with a stern thruster. In this I am pretty straightforward and also suggesting my clients to go for an option like this because I have the opinion that every part or option that makes operating your boat easier – thus safer – is a good thing. Better skip the cockpit BBQ station in favor of a stern thruster. This might, at a first glance, not sound like “no frills”, but it will become “no frills sailing” because it makes maneuvering, berthing and negotiating narrow marinas so much easier.

Some six months ago I was taking our Oceanis 51.1 client to the yard at the Atlantic Ocean. By the way, what a relief to be able to travel again, cross borders effortless, meet our friends in France again and finally see the yard! This reminded me so strongly of a time that I was happy I thought was long gone, a time when travelling was forbidden and people had to stay inside their country. Well, no politics on board. So, we went to France and had exactly this discussion: “Stern thruster or not?” Our client opted in favor, which I applauded. Since Beneteau does not offer a stern thruster option for the Oceanis 51.1 , we had to look for another solution.

So, after delivery to Germany we have the yacht now in commission. A certified supplier was quickly found and these guys agreed to take on the job of retrofitting a stern thruster to this yacht. A process I found highly interesting and wanted to share with you guys on this occasion. So here is how a stern thruster for a cruiser is mounted. We opted for a version that will retract into the hull so that the boat´s hydrodynamics won´t be meddled with. Of course there are solutions of hull-mounted thruster systems but we found these were too weak in terms of thrust produced and we did not like to carry a bulb under the hull.

Cutting a hole in a brand new ship

When the antifouling for this yacht had been finished – utilizing the great spring weather with unusual high temperatures and a relatively low humidity – the craftsmen arrived. Checking the boat´s inside, they marked the spot and began cutting a huge hole into the hull . This is always heartbreaking (and I do not have any pictures from this operation) since deliberately punctuating a hull of a ship always feels odd.

That rectangular hole then got sealed and a base mount got fitted onto which the housing of the stern thruster was mounted. This whole operation lasted just a working day and as strange as it may sound, it was a routine operation, a relatively small invasive action. The thruster-unit itself is a housing with the screw attached, shaft driven from inside the boat.

The whole system consists basically of the screw and the mechanism for driving in and out the propulsion unit. When inside the boat, the hull is faired and smooth, you barely see the closing plate of the stern thruster. Moving it into operational mode, the system takes about 2 seconds to lower the drive-unit in place, the system is now ready for action. As simple as that. But it is by far not that simple, as I could see when climbing into the lazarette of the yacht.

XXXXBILD 04 drinnen

Seen from the inside, first of all, the fears of having a big hole in the hull are baseless: The housing of the thruster is mounted on a base plate that got sealed, or glued, and screwed every 5 or 6 centimeters to the hull. If done properly, like on our boat here, there won´t be entering a single drop. By the way, these retractable thruster systems can also be fitted in the bow as bow thrusters, I think Hallberg Rassy does these in their boats in standard. I know not a single case of leaking thruster systems.

Is it really that simple? Well, after I am experiencing on my own boat right now that “simple” is a word that has different definitions (as mounting a “simple” solar power array turns out to be much more complicated than initially thought it would) I am a bit reluctant to use this word. It may be, for a pro. So I zoom out a bit, sitting in the cramped lazarette, and check what a stern thruster is also about … and find much, much more stuff than expected.

The stern thruster configuration

At first: Our Oceanis is loaded with options. As this boat is configurated by the owners to operate independently for longer times, it has been fitted with a generator, for example, that takes on about half of the space available in the lazarette. Here we also have the rudder bearings and mechanics of the rudder mechanism as well as the autopilot . Also, other auxiliary machinery and parts are located here. Quite cramped. And now our partners had to squeeze in the stern thruster too. Let´s see what this is all about.

As you can easily tell on the upper picture, next to the thruster-unit itself there are two big AGM batteries. Of course! The thruster needs electric energy and a load full of power! An Oceanis 51.1 displaced 14 tons, fully loaded maybe 15 tons. That´s a lot of inertia to overcome, so the thruster needs to produce a lot of thrust – that needs power. Two big sets of batteries. These guys need to be loaded, so, again, we need a connection to shore power (and thus an AC/DC-converter) and a charging device, together with a connection to the Diesel engine for loading whilst under motor.

This whole installation needs to be safeguarded by fuses, needs to be grounded of course and we need some kind of indication instruments, data impulses sent from the thruster to the system to show data. That´s a lot to care for and to install. I´d say the whole system takes on an area of easily 1 x 1 meter inside the boat´s stern. Nevertheless, our partner have made a darn good job on this particular boat as I find the installations executed in a clean and professional manner.

After having checked everything down below from inside the boat, I squeeze myself out on deck again. Wiping off the fine GRP dust from the lazarette I close the large entry hatch and proceed behind the starboard steering wheel (which has not been mounted yet) to take a look at the controlling unit, which is also quite an update to the standard version ex-works and is worth a closer look.

Stern thruster control panels

I know it´s a discussion amongst yacht owners I´d say since a Diesel engine had been mounted on a boat for the first time: Where to put the controls? With Beneteau, it´s easy: In standard the control lever is at deck level, mostly starboard side. You can either sit on the coamings, leisurely steering with your left hand, grabbing down between your legs and pull the engine lever whilst sitting. Or, like I prefer to do, standing up right behind the wheel for a better sight and controlling the lever with your foot. It takes a bit of practice, but it works fine. In standard, the bow thruster control unit – at least with a Beneteau – is mounted on the very coaming. The yard assumes that most skippers would sit here, so it is well in reach.

For skippers like me, it´s a bit odd since we have to bow down to push the buttons or kneel on the coaming. I never quite liked this set-up but, like with everything, you can get used to it. Now, on this particular Oceanis, we as well received the boat fitted ex yard with a bow thruster hence the control panel on the coaming. With a stern thruster fitted, Side Power offers a much bigger control panel which jointly operates bow and stern thrusters – and that´s the one our client went for, of course.

The new control panel is from Side-Power too. It – lucky for us! – fits exactly on the starboard side console between chart plotter and auto pilot controls. The panel features the switch for activating both bow and stern thrusters, taking the stern unit those said 2 seconds to come out and start up. It also has the left-right levers for controlling the thrusters which is now becoming super easy for the skipper. Just standing up right here behind the wheel the owner can now oversee the whole boat, push the controls and have the boat maneuver accordingly.

Best thing: The levers not just activate or de-activate the thrusters, like it would have been the case with the standard controls. The more the levers are pushed, the more thrust is produced. That means that not only both bow and stern thrusters can be controlled from here but also the level of thrust they produce. This is absolutely awesome! The owner shows me the remote control which also enables him to berth the boat freeing him from the steering wheel position, another cool aspect.

Only thing that makes our heads wrap around solving this little problem is the hole we now have to plug right there on the coaming. This is the old now useless control unit for the bow thruster. Unfortunately, the hole is drilled through all of the boat, not just the Teak battens but also the whole GRP deck. Underneath some other cables from installations are visible, so this needs to be closed watertight. We check if we change the whole Teak-panel of this are or if it is possible to take out the two Teak-batten and replace them. A simple GRP-plug glued in with Epoxy underneath will also do it.

Ready for mast-stepping

Now, I found this operation very interesting: For boats bigger than 40 feet I always suggest fitting a bow thruster at least to increase safety and also bolster the skipper´s confidence to land his boat without mishaps even in windy situations or in narrow marinas. Boats bigger than 50 feet – this is my learning now – will be safer to operate if fitted with a stern thruster too. Now that I have seen which level of both craftsmanship and competence in electrics and electronics is necessary to fit it, I salute to our partners for this awesome job!

I really look forward to handover of this particular yacht of which I will post at least one or two more articles: During the coming weeks the mast will be stepped and all will be finished and polished, Quantum Sails is going to deliver a set of cruising-laminate sails and I am absolutely excited to check the increase of sailing performance on a boat like this comparing standard sails with the new garments. The only downside about working with boats like this: Returning to my own 27 feet is always a little shock, but just for a few moments …

You may also find interesting to read these articles:

Bow thruster: Hole in the bow?

The Jet Thruster-system

In the yard: How´s a boat made?

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Guide: Bow and stern thrusters for recreational boats

1. Introduction

2. What is a boat thruster?

3. Brief thruster history

4. What are the different types of bow and stern thrusters?

5. Why do you need a bow and/or stern thruster system?

6. How to choose the right bow and stern thruster

7. Common problems with boat thrusters and how to avoid them

8. What kind of thruster upgrades are available?

9. What does it cost to install a bow or stern thruster?

10. What is the maintenance of a thruster?

11. Whom do I contact if I want a thruster for my boat?

Introduction

The product range of boat thrusters is now far more extensive than just a few years ago. Thus, it is essential to research thoroughly to understand which solutions will work best for your boat. In this guide for bow and stern thrusters, we give you in-depth information as well as what aspects to consider. 

Choosing the best bow or stern thruster for your vessel is quite critical, as the thruster probably will accompany your boat for decades to come. Here we share our collective knowledge from more than 40 years of designing and manufacturing thruster systems for leisure and workboats. Our goal is to guide you towards the best possible thruster system for your vessel and your needs.

Here we will primarily address bow and stern thrusters with 12 and 24 VDC operating voltage. For AC electric and hydraulic bow and stern thrusters,  you can download a dedicated pdf here →  

We hope boat owners, boat brokers, boat manufacturers, and other interested parties will find our articles helpful and practically useful. 

What is a boat thruster? 

A boat thruster is a device that moves the boat in a sideways direction. Vessels fitted with both a stern and bow thruster has total 360 directional maneuverability. The most common type of boat thruster is a tunnel thruster installed in the bow or stern of a vessel with one or two propellers driven by an electric or  hydraulic  motor.

Brief thruster history

The relatively high costs of employing tugboats for every arrival and departure from port for commercial vessels were reasonably the main force behind the first thruster developments. Installing one or more thrusters on these massive ships made sense also surpassing the point of running cost reductions, as they increased the vessel's maneuverability and thereby increased safety in crowded waters. In the mid-1980s, a few boat equipment manufacturers recognized the benefits that a bow thruster could provide for all boat types and sizes, and the development and production of the first thrusters for leisure boats hit the market. For many years tunnel-based bow thrusters were open to the market; however, at that time, the products were considered to be relatively expensive accessories. But as average boat size increased steadily from year to year and the ports did not many boat builders now saw that such a docking aid offered tremendous support for boaters in the increasingly crowded and tight harbors.

What are the different types of bow and stern thrusters?

Today, there is a thruster for virtually any boat, regardless of hull type, material, or size from about 20 feet and upwards. 

The most common thruster categories in the market today are: 

• Thrusters installed in a tunnel
• Retractable thrusters
• External thrusters 

The standard tunnel-based thruster is still the leading choice for most boat builders. Yet, due to a more mature market, requirements for installation flexibility and increased thrust-power has led to many redesigns, allowing for a well-functioning thruster solution for almost any vessel.

You can read more about the  pros and cons of different thruster solutions here →

Download free guide: Hull design for thruster tunnels

• The shaping of the tunnel connection
• The positioning of the tunnel and thruster
• Tunnel length 
• What solution to use for each boat model
• Design advice that will save you time and cost

Why do you need a bow and/or stern thruster system?

Running your vessel in the open sea is a breeze, but come to a busy overcrowded or tricky harbor, and you may feel your blood pressure rise. As a mariner, you might have experienced that in these conditions maneuvering your vessel can be far more demanding than it seems.

Read more: Do I need a bow thruster on a small boat?  →

Calculating wind, ocean current, tides, and other crafts' presence creates a chaotic three-dimensional dilemma in the brain, wishing you had the mind of an Apollo space astronaut. With one or more thrusters onboard, you gain one of the most critical factors to reduce stress while docking, which is time. Time to orient yourself, time to consider and plan, and time to wait for others!

Main benefits include: 

• Better control under demanding conditions
• Less stress
• Lower risk of collision
• More attractive aftermarket value
• Being able to maneuver the boat on your own 

Many boaters tend to have a lifelong relationship with the sea. Unfortunately, as age slowly takes its toll, handling your vessel becomes more difficult. But this is where a  PRO thruster system  can keep your passion for the sea thriving and well. With a bow and stern thruster with variable speed control onboard, you can pin the boat in the desired location and get alongside the dock and operate even a large vessel on your own the same way.

How to choose the right bow and stern thruster

Few boat owners will voluntarily accept the cost or labor to replace a pre-installed thruster, even if it does not perform as desired. So, picking the right thruster the first time is crucial for many years of operation after installation.  

The most critical factors for choosing the right bow or stern thruster are:

•  Sufficient thrust to cover your intended use with a good safety margin
•  Location in the hull
•  Adequate and sustained energy supply (battery voltage)

Read more:  How much power do I need from my bow and stern thruster installations? →

The right thruster is energy efficient, quiet and powerful enough to help you in the worst possible conditions when the thruster is needed the most.

Common problems with boat thrusters and how to avoid them

From more than 40 years of designing and manufacturing thruster systems for leisure and workboats, we have experienced that boaters have two main struggles with their thrusters: insufficient thrust force and noise.

Sufficient power is paramount

A bow or stern thruster that cannot deliver adequate thrust when you get caught in windy conditions while docking when you genuinely need the assistance of a thruster to control the vessel is undoubtedly a poor investment.

There are three common reasons why a DC electric thruster may perform less than desired, whereas number one is considered most common:

•  Too low power supply to the electric motor under load. A drop of only 1-2V can correspond to a significant loss of thrust.
•  Obstruction to the flow of water through the tunnel from improper tunnel installation or hindrances.
•  The thruster is not dimensioned correctly for the vessel's size from the beginning. Check if you can upgrade to a more powerful electric motor within the current tunnel diameter.

There is also a lot that you can do to reduce the noise produced by a thruster. The most important is to make sure the tunnel installation is optimal. - a thruster installation that screams throughout the harbor is, in fact, usually due to incorrect installation. To achieve an acceptable noise level, you should: 

• Select the maximum possible diameter for the hull
• Check the tunnel openings have the correct geometry
• Install the tunnel deep enough not to suck air from the surface and through the tunnel

If you want a more massive heavy-duty bow or stern thruster, we recommend a speed controlled thruster . Under normal operating conditions, you will rarely need to run the thruster at full speed, which lowers the noise level significantly. Running the thruster at 50% load, for instance, will usually be close to undetectable. 

Furthermore, it is essential to keep in mind that the bow of a boat may act as a speaker membrane when vibrations are applied. If you are very unlucky, the propeller will generate a frequency that resonates with the hull's natural frequency, which in turn creates a robust gain in noise. Traditional sound attenuation used in cars and the like can make a big difference. However, check that the material is suitable for marine use.

What kind of thruster upgrades are available?

For many vessels, there are several possibilities to upgrade or improve an existing installation.

With a thruster in both the bow and stern, you get better control of the vessel than with a bow thruster alone. You are also able to rotate the boat in any 360 direction while stationary. 

With variable speed control, you get: 

• Lower noise under normal conditions
• Longer run times
• Hold function: with a single press of a button, the bow and stern thrusters will pin the boat alongside the pier. The amount of thrust applied can be adjusted. Besides, the bow and stern thruster can be individually synchronized to get a balanced sideways motion, resulting in easy docking, even if you are on your own.

Apply higher voltage to the electric motor which generates higher thrust. Evaluate the replacement of:

• Battery pack
• Thicker cables
• Or a dedicated battery mounted closer to the electric motor if the voltage is low.

Install a remote control.

Check if your model can  get an upgrade  with new, more quiet, and efficient propellers. 

Upgrade to PRO

Upgrade kit PRO™ SE40-250

Upgrade kit PRO™ SE100/120/210/240

Upgrade kit PRO™ SR80/100

Whom do I contact if I want a thruster system for my boat?

With nearly 50 years of R&D experience, we are dedicated to helping you understand your own needs and technical specifications to find the best thruster system for your boat. 

Please see our dealer overview to find a local Sleipner representative who can guide you further in the process of securing a good solution for your boat. 

If you did not find what you were looking for in this guide, you are welcome to send us an inquiry here . We wish you lots of great times at sea, and also in port! 

What is the maintenance of a thruster?

A thruster will generally require little maintenance and have low operating costs after installation. If you follow the manufacturer's maintenance plan, which mostly involves regular cleaning, replacement of sacrificial anode, and general inspection, the thruster can for excellently for many, many years. 

What does it cost to install a bow or stern thruster?

Typically, a thruster will represent a low proportion of the boat's total cost, especially when buying a new boat. For retrofitting, it is a bit more complicated, as it will vary considerably from boat to boat depending on how accessible the area for installation is and the running of cables. Our best recommendation to obtain a decent understanding of the overall cost is to contact an experienced installer and ask for an actual offer based upon their experience from similar boats or by letting the installer do an inspection of your vessel. A stern thruster installation would typically be an easier installation without the need to fiberglass work unless the thruster model is a retractable version.

• Thrusters for recreational use
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Have questions? Call 1-877-325-4787 Call Now!

Outboard and Sterndrive Thrusters

Sideshift is proud to introduce the marine industry’s first outboard or sterndrive mounted stern thruster! (US Patent 10953974) Finally, an easy-to-install stern thruster solution that attaches directly to any outboard or sterndrive powered boat from singles to multiple engine setups.

Universal Mounting on any Outboard or Sterndrive

The new ST230 Series Stern Thrusters from Sideshift are perfect for any boat up to 40′ in length.  The thruster mounts to the cavitation plate of any outboard motor or I/O for easy in-water installation, and completely eliminates the mounting issues common to most outboard or sterndrive powered boats.  The unique mounting position creates zero drag as the unit rides above water when the boat is on plane. The extreme aft location of the thruster provides a strong pivot point advantage for immediate response in stressful docking situations. When seconds count, Sideshift delivers the performance you need.

No bulky tunnel is required, and our unique universal mounting system requires  no holes below the waterline , eliminating the risk of leaks associated with all other types of thruster systems.  And when combined with your Sideshift or factory bow thruster, you can add our dual wireless joystick option for easy single-handed operation of both thrusters for true 360 degree control of your boat in any situation.

Did you know that according to BoatUS Insurance, a full 44% of sinkings are a result of failed fittings below the waterline?

Silent and immediate response is provided by our prop-in-water design, 8” aluminum propellers, and heavy-duty water cooled motor. Saltwater proven, our rugged OB Series Stern Thrusters are anti-foul painted and anode-protected to prevent corrosion.

Maneuver with confidence into the tightest slips with a simple touch of the wireless joystick. Step onto the dock while maintaining total control of your boat with our wireless key fob controller.

Shipped as a complete kit with thruster, controller, mounting hardware, wireless joystick, fuse, digital voltage indicator and battery switch, installation takes less than a day.

ST230 Outboard + Sterndrive Mounted Thruster

(up to 30′ boats).

ST340-OB Outboard Mounted Stern Thruster

(up to 40' boats).

ST350-OB Outboard Mounted Stern Thruster

(up to 50' boats).

ST230-Dual Outboard + Sterndrive Mounted Thruster

(up to 40′ boats).

ST240-Dual Outboard + Sterndrive Mounted Thruster

(up to 50′ boats), features and benefits.

Sideshift ST230 Series Stern Thrusters are perfect for outboard or I/O powered boats up to 40′ in length. Our outboard mounted thrusters have several key advantages and features, including:

• Universal Mounting On Any Outboard Motor or Sterndrive

• Dual wireless joystick option connects to all existing bow thrusters
• No Holes Below the Waterline
• DIY Installation in <1 Day
• No Space Required Inside the Boat for Tunnel or Motor
• All Inclusive Kit
• Rises Out of the Water When Boat Planes – Zero Drag
• Rugged and Reliable

All-Inclusive Kit

Sideshift ST230 Series Stern Thrusters are sold as a complete kit. Everything you need is included except the power source:

• Motor Controller
• Wireless Joystick
• Wireless Remote Key Fob
• Wiring Harness
• All Mounting Hardware
• SikaFlex Sealant
• Fuse/Digital Voltage Indicator
• Battery Switch

Simply open the box and get started. When you’re finished the installation just connect to a dedicated power source and enjoy a stress-free boating experience!

Installation

Sideshift bow and stern thrusters can be installed in less than a day. Conventional thrusters take days to install by a professional. At Sideshift, we make installing your thruster a breeze.

• Easy, do-it-yourself installation
• Detailed installation manual, installation videos, and unlimited phone support
• Can be installed with your boat in the water
• No holes drilled below the waterline
• No motor inside the hull
• Can be installed by any marina or boatyard

Visit our online store to view our full range of thruster products

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Product Benefits

Yacht Thruster™ is a German quality/Swiss precision designed, engineered and tested system manufactured to provide durability and performance with almost triple the operating time of a comparative electric boat thruster system. 25 minutes an hour, plus a 3-year warranty. Yacht Thruster™ requires no maintenance other than bottom paint and the motor is completely sealed.

Easy Installation

Requires drilling of only three small holes to assemble, which are sealed tightly with a special rubber sealant. No fiberglass work is necessary.

Space Saving

The complete drive unit is very compact and placed externally, saving valuable boat space. Only the operating and control elements, as well as the power supply remain inside the boat.

Minimal Noise

About 80 % noise reduction is obtained by the external placement of the engine. this also results the elimination of possible border cavitations.

Optimal Efficiency

Optimal efficiency results from a shorter transverse channel and ideal leverage which is created by deeper and more distant positioning away from the pivot point. Typically giving up to 40 % higher efficiency than with conventional systems.

Long Runtime

The external placement of the unit gives a more efficient water cooling and allows much longer duration per cycle of the unit than with traditional bow and stern thrusters.

Optimal Design

Hydrodynamic shape, very short flow-channel and ideal placement reduce the water resistance to a fraction compared to conventional systems. There is no perceptible loss of speed.

Simple and Quick Installation

Virtually no resistance in the water.

Tank testing proves that water resistance under power is less than .09% (nine hundredths) power loss, under sail is .05% (five hundredths) loss under sail compared to a tunnel thruster at 10% sail handicap, and equivalent to the drag of only a folding propeller.

Utilizes approximately ½ the amperage of an equivalent LBS thrust tunnel thruster and Minimizes battery consumption Yacht Thruster™ Nominal current.

Specifications - Simplex Thruster Models

Model 300s (bow) - boats up to 55 feet*.

Model 300C (Stern) - Boats up to 47 feet*

Model 300S	Specs
Power (KW)	3.0
Thrust Equivalent (lbf)	207 bow / 148 stern
Voltage (V)	24
Nominal Current (A)	175
Length	26.5 in
Diameter	6.5" x 6.5"
Weight	43 lbs
Propeller (type)	B010903003-C
Recommended Boat Size (Bow)	Boats up to 55ft
Recommended Boat Size (Stern)	Boats up to 47ft

The system control center

• Provides delay between drive directions.
• Monitors solenoid functions to reduce the chance of solenoid lock-in.
• Will stop the thruster in case of a locked-in solenoid, without extra user action and even without controlling the main switch.
• Uses the same components as the other Side-Power series and can be combined with any other Side-Power thruster.

Sailboat Installation Positioning

Optimal position for external Yacht Thruster™ installations:

• Bow Thruster (B)
• Stern Thruster (S)

On round chines there is no/limited necessary GRP work.

Motor Yacht Installation Positioning

• Stern Thruster under swim platform (S1)
• Stern Thruster on “vertical transom” (S2)

On hard chines a fiberglass adaptor may be necessary for installation.

Adaptor Installation

Installation of an external Yacht Thruster™ is quick and easy. Simply drill a 50 mm diameter hole through the hull for the S/S through-hull fitting (attached to the thruster) which also feeds the required wiring. This through-hull fitting is supplied with a watertight seal which eliminates the need of additional fiberglass work. Also supplied as part of the installation kit are S/S rods to be bolted through two 18 mm pre-drilled holes. This also includes watertight seals and provides ultimate security and rigidity of your external yacht thruster™ installation.

The front mounting bolts are also secured from the vessels interior and provide a watertight seal.

Special Watertight Sealing

The unique seals provide a permanent watertight solution.

Hi-Tensile Aluminum

Our thrusters are milled from solid blocks of hi-tensile aluminum for incredible strength and durability.

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Model 300C	Specs
Power (KW)	3.0
Thrust Equivalent (lbf)	148 stern
Voltage (V)	24
Nominal Current (A)	175
Length	17 in
Diameter	6.5" x 6.5"
Weight	34 lbs
Propeller (type)	B010903003-C
Recommended Boat Size (Bow)	N/A
Recommended Boat Size (Stern)	Up to 47ft

Delivery & Support

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• This item can be returned in its original condition for a full refund or replacement within 30 days of receipt.

Purchase options and add-ons

About this item.

• Easy to install, no fiberglass lamination
• German quality Swiss precision
• Completely sealed/ long run time/low Battery draw
• Maintenance free/ quiet Operation
• 2Year complete replacement

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Product Description

Externally mounted thruster solid aluminum.

From the Manufacturer

Two thrusters mounted together in one unit. Externally mounted solid aluminum. L38 x 6 in. Includes full mounting kit with instruction manual, electronic box, fuse, mounting apparatus and your choice of joystick or touch pad control for a complete system.

Product information

Technical details.

Item Package Dimensions L x W x H	‎38.2 x 16.4 x 8 inches
Package Weight	‎106.1 Pounds
Item Weight	‎77 Pounds
Brand Name	‎Yacht Thruster
Country of Origin	‎Norway
Color	‎Silver
Manufacturer	‎Yacht Thruster
Part Number	‎600d
Size	‎55-65-Feet 600D

Additional Information

ASIN	B00ANJ3ZJ6
Date First Available	December 13, 2012

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