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Meet Project Sonata, a Rule-Breaking 351-Foot Sailing Yacht That Cruises Like a Luxury Liner

If ever built, sonata would be a first for sailing superyachts. it would have high-tech sails, but would ride more like a motoryacht., julia zaltzman, julia zaltzman's most recent stories.

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What do you call a superyacht concept that takes the progressive learnings from the world’s leading new builds and packs them together in one visionary design? You call it Project Sonata. With three DynaRig systems inspired by the legendary sailing yacht Black Pearl , an inverted bow to slice through waves and enough space on board to compete with a motoryacht, could the 351-foot hybrid sailing yacht have it all?

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Project Sonata is the work of emerging Swiss studio Valentin Design. Headed up by industrial designer Valentin Weigand, winner of Young Designer of the Year 2020, and naval architect Romain Acquaviva, the duo have their eyes set on a more sustainable, smarter, and buildable yacht.

“Our aim is to create a sailing superyacht that is more accessible to clients than the ones currently in the water,” Weigand told Robb Report . “Many clients are scared off by how complicated they perceive sailing yachts to be, requiring large numbers of crew and complicated rigs. We want to offer something that combines the joy of sailing with the ease and comfort of a motoryacht.”

The master stateroom, encased in a glass bubble, offers immediate access to the outdoors.  Courtesy Valentin Design

Sustainability is also key to the concept. Two diesel electric engines generate recuperative energy through the yacht’s propellers while sailing, supplying enough power for the hotel load and to charge its Lithium-Sulfur battery pack. The 4MW batteries, developed by Oxys Energy, are free of heavy metals, such as cobalt, and are considered safer than Li-ion batteries.

The pair have strengthened their proposition by drawing on the expertise of Derek Munro, director at Divergent Yachting, who was instrumental in the construction of Oceanco ’s groundbreaking build Black Pearl .

“Derek has first-hand experience on what can be optimized or simply didn’t work with Black Pearl ,” said Weigand, “and we’ve worked that into the design of Project Sonata to eliminate those points.”

The beamy exterior looks more like a motoryacht than a sailing vessel, with access to the outdoors and water.  Courtesy Valentin Design

What works includes a 16-foot retractable keel that saves 6.5-feet of draft when required. The considerable DynaRig is low in maintenance yet highly durable, meaning a smaller crew is required. And, like Black Pearl , the tips of the masts can be unmounted to give enough clearance to sail under the Bridge of the Americas, and access the Pacific Ocean through the Panama Canal.

“ Black Pearl’s masts underwent three years of engineering and are proven to be highly efficient,” said Weigand. “By using the same molds on Project Sonata, we save time and money. In the same vein, the seating arrangement aboard Black Pearl is not ideal for heeling. We’ve ensured all exterior decks have been designed with heeling in mind.”

That said, Project Sonata has also undergone computational fluid dynamics studies to ensure it performs when sailing without heeling too much. “Most sailing superyachts’ main functions are regattas, which means they are super-fast, super light and heel a lot,” Acquaviva told Robb Report . “This can be really scary for owners who are used to stability and comfort, so our design prioritizes the guest experience. Our inverted hull extends the waterline length and cuts through waves.”

Courtesy Valentin Design

At 2,992 gross tonnes, the interior volume is sizable, complemented by features that follow the current trend for a connection to the outdoors. “The only thing our design lacks is a large swimming pool, which requires too much space on a sailing yacht,” said Weigand. “We’ve mitigated that with multiple exterior platforms to access the sea itself.”

A large sun deck affords alfresco dining. On the interior, glass is king, creating a design without visual borders. The master stateroom, spread across two decks, is virtually encased in a glass bubble. The VIP cabin enjoys direct access to its own private beach club, making a novel charter proposition. A double height atrium in the formal dining area speaks of elaborate guest entertainment. This also supports the studio’s intention to make the forward areas formal, so as guests move aft the more causal the design becomes.

Project Sonata, presented to the world by Ocean Independence, is a bold proposal from a studio made up of keen sailors, but whose sailing yacht designs to date have been limited to the 50-foot range. But that hasn’t deterred the dynamic pair.

Sonata’s inverted bow is as distinctive as its masts.  Courtesy Valentin Design

“I’ve been sailing on boats since I was kid and worked in refit and construction for over 12 years,” said Acquaviva. “I understand what an owner wants from a sailing yacht, but equally what the crew need. When combined with visionary design and fully engineered naval architecture, we believe that’s a winning formula.”

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Used SONATA Boats for Sale

Buy and sell used sonata boats.

Find Used SONATA boats for sale throughout Australia with yachthub.com - the best referenced boating website in Australia and New Zealand. Searching and finding your next Used SONATA boat is easy on yachthub.com, with listings of Used SONATA yachts for sale from the largest range of boat dealers and private advertisers.

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Sonata Boats For Sale in Australia

Found 6 listings.

• New Sonata Boats For Sale
• Used Sonata Boats For Sale

1984 Sonata 7 T. S. Lying : Goolwa S. A. Possibly Sonata's best all round yacht, ...

• 23' / 7.00m

1979 Investigator Yachts Sonata 7 **added extra interior pictures** Recently refurbished ...

• 22' 8" / 6.90m

1981 26 ' Fixed Keel Sonata 8. Good racing history. New rigging 2021 New Boombag ...

• 26' / 7.92m
• AU $11,000 Negotiable

Sonata 6.7, Full Refit 2023, Mast/ Boom Paint/ New Rigging ( running and standing), New North ...

• 22' / 6.70m
• 1990 approx

Sonata 8 1980 Sonata 8 (Centreboard / Lift Keel)

1980 Sonata 8 (centreboard / lift keel)for sale. Have owned it for 30 years, reluctantly ...

• 26' 3" / 8.00m
• 1980 approx
• AU $15,000 Negotiable

This is a lovely custom made Sonata with a "like-new" trailer. A great solid ...

• AU $14,999 Make an offer

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• Sailboat Guide

Sonata 6.7 is a 21 ′ 11 ″ / 6.7 m monohull sailboat designed by Gary Mull and built by Sonata Yachts (AUS) starting in 1986.

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)

Lifting keel version also available.

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Review of Sonata 7 (Thomas)

Basic specs..

The hull is made of fibreglass. Generally, a hull made of fibreglass requires only a minimum of maintenance during the sailing season. And outside the sailing season, just bottom cleaning and perhaps anti-fouling painting once a year - a few hours of work, that's all.

The interior is like most other boats made of teak. Teak has the advantage of being naturally very oily and therefore water-repellent, which is suitable on boats. The boat is equipped with 2 cabins, 4 berths, a galley and toilet facility.

The Sonata 7 (Thomas) 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.

The Sonata 7 (Thomas) is equipped with a fin keel. A boat with a fin keel is more manoeuvrable but has less directional stability than a similar boat with a full keel.

The keel is made of iron. Many people prefer lead keel in favour of iron. The main argument is that lead is much heavier than iron and a lead keel can therefore be made smaller which again result in less wet surface, i.e. less drag. In fact iron is quite heavy, just 30% less heavy than lead, so the advantage of a lead keel is often overstated. As the surface of a fin type keel is just a fraction of the total wet surface, the difference between an iron keel and a lead keel can in reality be ignored for cruising yachts.

The boat can enter even shallow marinas as the draft is just about 1.40 - 1.50 meter (4.59 - 4.89 ft) dependent on the load. See immersion rate below.

An outboard motor is often used on this boat. In that case Sonata 7 (Thomas) will typically require a power of 3 - 4 hp, alternatively 56 - 67 lbs thrust if you prefer an electrical motor. Electric outboards are becoming popular for sailboat owners who want clean instant power with less noise and no exhaust fumes.

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 Sonata 7 (Thomas) is 2.45, indicating that this boat would not 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 5.7 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 Sonata 7 (Thomas) is about 98 kg/cm, alternatively 552 lbs/inch. Meaning: if you load 98 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 552 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)?

What is Relative Speed Performance?

Maintenance

When buying anti-fouling bottom paint, it's nice to know how much to buy. The surface of the wet bottom is about 17m 2 (182 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 Sonata 7 (Thomas) 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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Award-winning Executive Chef Ted Dorsey has curated an incredible menu featuring “Coastal Cuisine rooted in Southern Hospitality.” Nestled in the heart of downtown St. Petersburg, Sonata Restaurant is a harmonious blend of the Three Arts – theater, culinary, and visual. The name, “Sonata,” derives its inspiration from the musical term, signifying a composition that brings together diverse elements in a harmonious way, much like the seamless fusion of flavors, culture, and the arts within our walls.

Step inside Sonata, and you’ll immediately sense the theatrical ambiance. Our dining space is an elegant stage, adorned with captivating artwork from Trish Duggan of Imagine Museum, evoking the vibrant art scene of St. Petersburg. The walls come alive with the work of local artists, their creations changing with the seasons, creating an ever-evolving visual symphony that accompanies your dining experience – all part of a collaboration with the theater, restaurant and visual arts – a vision inspired by  Bill Edwards  to create a destination for the arts in St. Petersburg.

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Limited Hybrid

Starting MSRP

2024 SONATA Hybrid SEL: 44 City/51 Hwy/47 Combined MPG. SONATA Hybrid Limited: 44 City/51 Hwy/47 Combined MPG.  All figures are EPA estimates and for comparison purposes only. Actual mileage may vary with options, driving conditions, driving habits and vehicle's condition.

192-hp gas/electric combined 2.0L GDI Hybrid engine ⁠

Leather seating surfaces ⁠

Panoramic sunroof ⁠

Blind-Spot View Monitor (BVM) ⁠

Remote Smart Parking Assist (RSPA) ⁠

Trim Features

Leather seating surfaces, driver's memory seat, blind-spot view monitor (bvm), surround view monitor (svm), parking collision-avoidance assist – reverse (pca-r), parking distance warning (pdw) – forward/side/reverse with contour warning, 12.3-inch digital instrument cluster, hands-free smart trunk with auto open, heated steering wheel, ventilated front seats, remote smart parking assist (rspa), ambient lighting, led interior lights, leatherette-wrapped dashboard, 12.3-inch touchscreen display with navigation, head-up display (hud), rain-sensing wipers, panoramic sunroof, rear side-window sunshades, bose premium audio, highway driving assist (hda), fender mounted turn-signal indicators, auto-dimming rearview mirror, also includes, bluelink® connected car system, heated front seats, proximity key with push button start, paddle shifters, drive mode select, 17-inch alloy wheels, led projector headlights, led daytime running lights (drl), heated bodycolor side mirrors, led taillights, shift-by-wire (sbw) gear selector, bluetooth® hands-free phone system, steering-wheel-mounted audio and cruise controls, 60/40 split-folding rear seatback, wireless android auto™ integration for your android phone, wireless apple carplay® integration for your iphone®, hyundai digital key 2, dual automatic temperature control, front and rear usb-c charging ports, wireless device charging, leather-wrapped steering wheel, 8-way power driver seat, 4-way power passenger seat, 2nd-row air vents, electronic parking brake (epb), power windows with driver and passenger auto-down/up, forward collision-avoidance assist with pedestrian detection (fca-ped), smart cruise control (scc) with stop & go, blind-spot collision warning (bcw), rear cross-traffic collision-avoidance assist (rcca), safe exit warning (sew), high beam assist (hba), lane keeping assist (lka), lane following assist (lfa), driver attention warning (daw), rear occupant alert (roa), confirm your zip code.

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