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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

    03.04.2008

    A very good day.

    par Gitana

    The albatrosses of California, flying fish, a deep blue sky, a small gennaker which we’re getting between 28 and 32 knots of headway out of… these past 24 hours have been idyllic. It was Hawaii in Hawaii, even if we left the islands a long way to the south of us. We honoured the reputation of the area in any case, with surfs that seemed to go on forever and likely to make even the most blasé of surfers green with envy. 32, 33, 35, and a peak recorded at 37.4 knots! However, the official record remains with our skipper for the time being. Just hours after passing under the Golden Gate Bridge, Lionel gave us a surf at 39.7 knots; an introductory offering to show just how determined he is to snatch this record. Of course this is currently held by Geronimo, a multihull which is bigger and more modern than Gitana 13. Having had the privilege to sail on her, I can attest to the fact that it’s an excellent boat so we’re really going to have to have the pedal to the metal the whole time if we’re going to rewrite the history books.

    It is 1500 hours in France but out here the day won’t be dawning for a good couple of hours yet. As usual, it’s one of the unwritten rules aboard that everyone has a turn at the helm, even if the time spent there isn’t necessarily equal. And if there was one person in particular that had a smile on his face today it was Kojiro Shiraishi! Peaking at 35 knots and an hour spent almost constantly over 30, he has absolutely pulverised his personal best. This is hardly surprising since sailing boats capable of going so fast in the middle of the Pacific can be counted, if you’re being generous, on the fingers of one hand!

    Until tomorrow

    Nicolas Raynaud