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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

    02.04.2008

    Awaiting the waves.

    par Gitana

    And the fourth night was the right night! The heaven was filled with stars and the men on watch on deck were finally able to chat amongst ourselves naturally, without having to bellow to make ourselves heard… The collars of our foulies are open now as we no longer have to do battle with the spray or the cold. The ambient temperature has utterly changed, as has the seawater, which is now 23°C, as opposed to 10 at the start. This changes the tone and this ‘truce’ comes as a welcome relief. Gitana 13 is dry again, the two hulls having been sponged down from top to bottom. The crew meantime has had a good rest for the first time, with the resulting deep sleep a real joy for the person in charge of waking everyone up. Each time the person being woken is a long, long way from this Pacific crossing record attempt and takes several seconds to climb aboard once more.

    So here we are, under the stars on flat seas with all the sail aloft. We’re slipping along on calmer seas, still beam on to the breeze. The sheets are in our hands; there’s a reef to be taken in as the wind fills in, albeit it temporarily… quickly followed by shaking out the reef again. Cups of tea or coffee once more circulate about the deck, where paradise reigns, but it won’t last. In the next few hours we’re expecting the wind to fill in again. We’re maintaining the same angle in relation to it so as to set off again with the best possible ‘heading/speed’ compromise, comfort having absolutely no part in the equation as you’ve doubtless grasped. However, Captain Lionel’s smile has everyone taking their medicine when, beaming broadly, he announces that in two days time we are likely to have covered half the course. “Five days to get halfway across the Pacific, not bad eh?” Go on then, I won’t mind getting dumped on by another wave after all!

    Until tomorrow
    Nicolas Raynaud