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  • Gitana 18
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  • Retractable Y-shaped foils, adjustable in three dimensions

    Inspired by the appendages of the America's Cup foiling monohulls, these Y-shaped foils have a wingspan of over 5 metres. They are designed to generate powerful lift, increase power and offer a wide range of adjustments to optimise flight at every point of sail and in all conditions. Beyond their impressive size, these foils feature many unique innovations.

    Revolutionary U-shaped rudders

    These are probably the most visually striking innovations on the new Maxi Edmond de Rothschild. To fly high above rough seas while maintaining control, the team wanted very long rudders that would remain in contact with the water. The challenge is that longer rudders tend to flex under load, severely affecting steering and the efficiency of their lifting surfaces. A new geometry was needed to give these appendages maximum stiffness, resist cavitation and ultimately improve control of the boat and make better use of its power. The result is a set of U-shaped rudders over 4 metres long, a metre longer than those on Gitana 17. Their shape, reminiscent of a tripod or an inverted π, is only the visible part of what makes them so distinctive.

    A daggerboard optimised to stabilise the boat and limit cavitation

    With its wide span, the daggerboard resembles an aircraft tail assembly, with two adjustable flaps: one on the vertical section and the other on the horizontal section, the distinctive “manta-ray wing”. On Gitana 18, the innovation is to position this wing behind the vertical part of the appendage, rather than directly beneath it, to minimise flow disturbance and cavitation.

    Gitana 18’s daggerboard

    Rig: adjustable spreaders to control mainsail power while sailing

    Gitana 18’s mast is 1.50 metres taller than its predecessor’s. The boom is also shorter, creating a more slender sail plan. The major innovation is a set of spreaders that can be adjusted while sailing to bend the mast fore and aft. Actuated by hydraulic rams, these spreaders can pivot through 35 degrees to adjust the bend in the middle of the mast. This unprecedented system allows the sailor to control mainsail power: adding depth in light winds to take off sooner, or flattening the sail to reduce power at high speed or in strong winds. Adjusting the depth, and therefore the power, of the mainsail can also save a solo sailor time and energy by reducing the need for risky manoeuvres or headsail changes.

    Central hull:
    an integrated, structural coachroof

    The naval architects and Gitana design team wanted an exceptionally stiff, structurally robust platform. This applies both to the floats, which must withstand heavy loads from the foils and rudders, and to the central hull, which is subject to torsion. The enclosed coachroof is integrated into the hull and contributes to its structural strength. Inside, the cockpit brings all sail-handling controls together, with ergonomics shaped by many hours of design and development. The coachroof also stands out for the number and size of its windows. This configuration meets the visibility requirements of the Ultim class rules and gives sailors the best possible view to keep a visual watch.

    Gitana 18’s coachroof

    19.02.2008

    Back to the northern hemisphere.

    par Gitana

    “We’ve seen the Statue of Liberty, the equator, Cape Horn, and now the equator again. All that’s left is the Golden Gate Bridge,” mused Lionel while we were all together in the windward hull. In the final rays of the setting set, we shared the only bottle of red wine brought onboard, a 2003 Château Clarke, and ate what was left of the cured ham. The equator is behind us, we crossed it today, Tuesday 19 February, at 00:56’39’ UT, eleven days and one hour after rounding Cape Horn. San Francisco is now less than 2,500 miles away, but our path looks as though it will be littered with obstacles.

    Since yesterday morning, the horizon has hung heavy with gray/black clouds. We haven’t yet reached the doldrums, far from it, but life onboard Gitana 13 has gotten busier. While the crew has made minor sail adjustments over the past ten days, now we’re playing with our whole sail wardrobe in response to capricious wind changes. Big gennaker, solent, small gennaker, in the tropical heat, scarcely refreshed by a little rain, we are back to trimming the sheets with the coffee grinder. This little game of matching the sail to the weather will go on for awhile, given the uncertain weather forecasts.

    On the menu: the doldrums starting tomorrow, then some close-hauled sailing, followed by a high-pressure ridge, then more close-hauled. We then hope very much to hit a front, which would mean cruising along for a bit on a reach.  This is an extremely simplified menu, of course. And Big Dead Cloud is sending out smoke signals one after the next to try to get a better idea of things. Today, we are full of patient hope; 33 days at sea teaches one to be philosophical, and a little more waiting won’t upset us.

    Goodbye

    Nicolas Raynaud