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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

    08.05.2008

    Restless nights.

    par Gitana

    After a stopover in Japan for almost a month, to within one night, we’re going to ‘miss’ our first earthquake! Lionel, Zolive and the two ‘newcomers’ aboard, namely Jean-Baptiste Levaillant and Antoine Mermod, wondered which position it was best to adopt whilst their bed, situated on the thirteenth floor of our hotel, began to shake at around two in the morning. Level 3 on the Richter Scale according to a sober announcement on the CNN news. As regards the rest of the crew, including your humble servant, the sandman had us in his grip… to their deep regret!

    It is with the taste of this anecdote in our mouths, which simply left a smile on the faces of the Japanese who came to see us off, we cast off under a half-fig, half-grape coloured sky. The introduction involved a string of manœuvres in order to extract ourselves from Tokyo Bay. A fine ‘lull’ invited itself to the start line, but fortunately business soon got back to normal. And so with night already upon us here, we’re making between 22 and 25 knots under solent and full mainsail. Japanese soil, just a handful of miles off, is providing us with a perfectly sheltered race zone.

    Tonight and over the coming days, we’ll be revising the navigation rules and the different light configurations. The shipping promises to be intense, and indeed it has already been so since our departure. There are just eight of us aboard, that is two watches of three hours. Suffice to say that between here and Dalian, we’re going to have very little time to get bored.

    Until tomorrow

    Nicolas Raynaud