470 sailboat hull speed

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• Sailboat Guide

Dufour 470 is a 48 ′ 8 ″ / 14.9 m sailboat designed by Umberto Felci and built by Dufour Yachts starting in 2021.

Rig and Sails

Auxilary power, accomodations, calculations.

The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.

Classic hull speed formula:

Hull Speed = 1.34 x √LWL

Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio .311 Hull Speed = Max Speed/Length ratio x √LWL

Sail Area / Displacement Ratio

A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.

SA/D = SA ÷ (D ÷ 64) 2/3

• SA : Sail area in square feet, derived by adding the mainsail area to 100% of the foretriangle area (the lateral area above the deck between the mast and the forestay).
• D : Displacement in pounds.

Ballast / Displacement Ratio

A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.

Ballast / Displacement * 100

Displacement / Length Ratio

A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.

D/L = (D ÷ 2240) ÷ (0.01 x LWL)³

• D: Displacement of the boat in pounds.
• LWL: Waterline length in feet

Comfort Ratio

This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.

Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam 1.33 )

• D: Displacement of the boat in pounds
• LOA: Length overall in feet
• Beam: Width of boat at the widest point in feet

Capsize Screening Formula

This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.

CSV = Beam ÷ ³√(D / 64)

Hull length: 13.99m / 45.9ft Reported sail area = main + 106% genoa. OptionL 75HP engine. Available in three versions: Easy, Ocean and Performance. The difference is in the deck layout. Photo above is of the Ocean version.

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Review of Hanse 470

Basic specs..

The hull is made of fibreglass. Generally, a hull made of fibreglass requires only a minimum of maintenance during the sailing season.

The boat is equipped with 378.0 liter fresh water capacity.

The Hanse 470 is equipped with a fractional rig. A fractional rig has smaller headsails which make tacking easier, which is an advantage for cruisers and racers, of course. The downside is that having the wind from behind often requires a gennaker or a spinnaker for optimal speed.

Unknown keel type

The boat can only enter major marinas as the draft is about 2.35 - 2.45 meter (7.71 - 8.01 ft) dependent on the load. See immersion rate below.

Sailing characteristics

This section covers widely used rules of thumb to describe the sailing characteristics. Please note that even though the calculations are correct, the interpretation of the results might not be valid for extreme boats.

What is Capsize Screening Formula (CSF)?

The capsize screening value for Hanse 470 is 1.95, indicating that this boat could - if evaluated by this formula alone - be accepted to participate in ocean races.

What is Theoretical Maximum Hull Speed?

The theoretical maximal speed of a displacement boat of this length is 8.6 knots. The term "Theoretical Maximum Hull Speed" is widely used even though a boat can sail faster. The term shall be interpreted as above the theoretical speed a great additional power is necessary for a small gain in speed.

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for Hanse 470 is about 376 kg/cm, alternatively 2108 lbs/inch. Meaning: if you load 376 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 2108 lbs cargo on the boat it will sink 1 inch.

Sailing statistics

This section is statistical comparison with similar boats of the same category. The basis of the following statistical computations is our unique database with more than 26,000 different boat types and 350,000 data points.

What is Motion Comfort Ratio (MCR)?

What is L/B (Length Beam Ratio)?

What is a Ballast Ratio?

What is Displacement Length Ratio?

What is SA/D (Sail Area Displacement ratio)?

Maintenance

When buying anti-fouling bottom paint, it's nice to know how much to buy. The surface of the wet bottom is about 64m 2 (688 ft 2 ). Based on this, your favourite maritime shop can tell you the quantity you need.

Are your sails worn out? You might find your next sail here: Sails for Sale

If you need to renew parts of your running rig and is not quite sure of the dimensions, you may find the estimates computed below useful.

This section is reserved boat owner's modifications, improvements, etc. Here you might find (or contribute with) inspiration for your boat.

Do you have changes/improvements you would like to share? Upload a photo and describe what you have done.

We are always looking for new photos. If you can contribute with photos for Hanse 470 it would be a great help.

If you have any comments to the review, improvement suggestions, or the like, feel free to contact us . Criticism helps us to improve.

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470 SPEED GUIDE BY SÎME FANTELA

Who sails the 470.

What does it take to be successful in the 470?

Who does what on the boat, what are the keys to rig set-up, what are the keys to rig tuning.

Upwind Sailing

Where does each person sit on a 470 in light air, what are the key changes in different conditions, what do you focus on when trimming the 470 main, what do you focus on when trimming the 470 jib, what are the key adjustments to make when wind and sea state increase, any other advice about gear changing in a 470, what's the typical conversation between 470 helm and crew.

Downwind Sailing

What 470 spinnaker would you recommend, where does each person sit in a 470 downwind, what are the key adjustments to make sailing downwind, what’s the most important thing about 470 trimming downwind in light air, what’s the most important thing about 470 trimming downwind in heavy air, what is a typical conversation downwind.

• What mode do we want to achieve (high and fast, or low and slow)?
• Is the Oscar flag up so we are allowed to pump?

Any special considerations to sail the 470 well downwind?

Boat Handling

Top three tips to starting a 470 well.

• Try to keep the flow on the rudder and centerboard as long as you can. Once you lose that, it can take some time to attach again.
• Always fight for space down to leeward. If you don't have enough, you're not going to survive the first 100 meters.
• Identify the last possible moment for a double tack. And whether you double-tack or not, know the right time for good acceleration and the right exit angle.

Any tips for 470 downspeed boat handling?

What is the most common mistake when tacking a 470, what does each person do in a tack, key tip for good light-air tacks in a 470, key tip for good heavy-air tacks, key tip for good light-air jibes, key tip for good heavy-air jibes, what’s the best way to set a 470 spinnaker who does what.

• Come in off the trapeze wire.
• Take the spinnaker tack out of the spinnaker bag with one hand, while pulling on the windward barber-hauler/twing with the other hand.
• Hook the pole to the sheet, topping lift, and mast - Jaws up!

What’s the key to a good 470 spinnaker takedown?

Personal Tip: We always have a windward takedown, because we have a storage bag on each side of the boat.

Doing a 720 penalty turn is slow. What are the keys to minimizing the pain?

How easily does the 470 broach or capsize, how do you recover from a 470 capsize, what are the most common boat helming mistakes made in the 470 class, any suggestions for drills to improve 470 boat handling.

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