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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

    11.02.2008

    Adios, southern latitudes.

    par Gitana

    Big smiles broke out yesterday—Sunday—at the end of the day. A streak of blue appeared in the sky after more than 72 hours of overcast, cold and wet conditions. This, along with a glimpse of the setting sun, is a sort of exit door. We had just won our tug-of-war with a vast low-pressure system that tried to ensnare us.

    With the ORC jib up and three reefs in the main, Gitana 13 took wave after wave over the bow, at the upper limit of the normally accepted speed. The hulls were wet inside and out, as was the crew, more than ever before on this trip. First close-hauled, then a little less so, we pushed our way through. Behind us, not far, the trap has closed. The north-northwest wind, along the axis of our route, was blowing 35-40 knots, which is the precise situation that we were trying to avoid, with a long, painful and dangerous upwind leg up the coast of Chile. Which means we picked the right window for getting around the Horn and then beginning our northward journey—good thing we didn’t miss it!  Right now, those are not good waters to be in: a new string of low-pressure systems has marched on Cape Horn since Saturday morning, and the door there is again closed until next Friday. We slipped through a mouse hole. Our thanks again go to Sylvain Mondon on land for guiding us with a sure hand…which we can count on at all hours of the day and night.

    Today we will move out of the southern latitudes, the famous “furious fifties” and “roaring forties.” Since we spent much longer here than anybody wanted, no one on board is sorry to go…although we’ll miss the endless flight of the albatross. We keep mentioning them, but you simply can’t help but fall prey to the charms of these birds that constantly skim the foam with their long wings. The biggest ones that we saw came last Saturday to put on one last show, a sort of farewell. Since then, no birds in the sky.

    Our goal for the next few days is to make progress up the eastern edge of the Easter Island high-pressure system. At 4:00 UT, the big gennaker resumed its post. It is pulling us toward warmer waters, where we’ll again see flying fish. The water temperature is currently 17°C, whereas it was only 6 °C at the tip of South America. With only 315 and 412 miles covered over the weekend, we’d really like to go into turbo mode, but we can’t do that just yet. In order to get into the best position, we are sailing far from the direct route. So our net progress will surely be less than 400 miles again.

    Goodnight

    Nicolas Raynaud