Category Daysailers

Gunboat G4 sea trials

The all new Gunboat G4, designed by DNA has launched in St. Martin.  As usual the work list was extensive to get out on the water.  A few days after the sailing began, the final adjustments were made to the daggerboards and she set out to break new ground.  In 18-20 trade winds, the boat was up on foils and generating lots of smiles for the lucky crew.  Schickler Tagliapietra served in a support role in the development of the boat, as a new member of the DNA design team.   FEA structural simulation of boat and foils, stability calculations, VPP performance prediction and more.  Follow Gunboat or Holland Composites on Facebook for more details.


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ST has been commissioned for the naval architecture of the new Inoxsail daysailer. This commission was completed in the Fall of 2011 and the boat will soon be under construction. It is a boat of just 5m LOA, but has been crafted with the same attention to detail as other larger projects. As part of the shape refinement process, rapid prototyping was used to get our hands on the design in physical format.

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9m Daysailer

This is a concept design for a 9m production daysailer with the requirement that two complete boats be shipped in a 45′ high cube shipping container. The brief was met with a stylish ultra simplistic appearance and operation, composite rigging and roller furling boom. The option for lifting keel version exists. Displacement is 2.2 tonnes with the fixed keel, but just 1.8 tonnes with lifting keel.

LOA 9.5 m (31 feet)

LWL 7.4m (24 feet)

Beam 2.3m (7.5 feet)

Draft 1.4 m (4.6 feet)

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45′ Daysailer

The core idea is that sailing yacht shapes are often most beautiful below the waterline. We have spent a disproportionate amount of time ensuring that faired surfaces from hull centerline to deck centerline form a single appealing body, and that the heeled and upright sailing characteristics are predictable, safe and above all fast. The underwater body is quite similar to that of a high performance keelboat. The higher freeboard creates a deeper, enclosed cockpit with real back support while seated instead of a low railing. This arrangement makes lifelines completely unnecessary. In summary, our vision for this boat is classic yacht styling, simply inverted.

The cockpit is opened up by the use of a whipstaff tiller, and sailing functions are largely handled by hydraulic rams. Two (powered) winches remain for all eventualities. Construction is carbon fibre, foam, and epoxy, obviously female moulded.

Below the water, there is a canting-lifting keel with very innovative composite motion, extending outward as it cants. This maximizes the sail carrying power for a specific draft, while reducing weight. A pair of asymmetric dagger boards provide the side force, and our deployed via pushbutton automated hydraulics.

You can see that we have a novel plan for extending the possibilities when at anchor, or tied up. The aft deck has a wet bar and gorgeous teak deck for sunning, but also offers an area of shade beneath the raised panel.

General Characteristics:

LOA 14.2m 44.5 ft
LWL 11.5m 38 ft
Beam 3.0m 9.8 ft
Draft 2.3m 7.5 ft
Displ 3.3t 7275 lb
Ballast 1.5t 3300 lb
SA upwind 94sm 1010 sf
SA downwind 185sm 1990 sf

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24′ Explorer

This 7.3 m yacht, commissioned for use on the inland lakes and coastal waters has some exceptional features. The design brief has been filled in a creative design utilizing two ballast keels raised and lowered in synchronization. The main motivation for this development is to create an unobstructed, though compact, interior in conjunction with the low draft. The keels themselves are arced inward to maximize stability, creating almost 5 degrees of static windward heel. Shifting the asymmetrically shaped foils from side to side is simply done with tackle, as the weight of each balances the other. Lifting them both requires only leading a line to one of the deck winches. The hull is shaped to take full advantage of crew weight for performance enhancing stability upwind and plane easily and smoothly off the wind.

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