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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

    21.02.2008

    Eclipse of the moon.

    par Gitana

    The Doldrums is now in our wake. Gitana 13 was able to slip along in a narrow vein of wind with 6 to 8 knots of SSE’ly, at the cost of a few gybes and a few long hours spent on port tack at nearly 80° to the direct course. The upshot of this type of sailing is that you can’t trace pretty lines across the chart and it comes as no surprise then, that yesterday was our smallest day since Cape Horn, or even since the start of our voyage, namely 176 miles along a great circle route.

    The facts that have stood out over the past 24 hours occurred last night. First of all, we passed our first cargo ship since we began sailing in the largest ocean on the planet, the trajectory warranting close monitoring if you please. The vessel struck quite an imposing figure and, bound for Panama, it passed less than quarter of a mile astern of us. The second sighting was by far the most impressive of the day, or the month even, so splendid and unexpected was it. Whilst we were under the spotlight of our second full moon since setting out from New York, it began to turn hazy. We were witnessing a lunar eclipse, the shadow of the earth almost totally masking it. Solely a minute crescent escaped this extinction, the consequence of which was the canopy of heaven, extinguished up to that point, was re-established for a good three hours during the eclipse. Though this phenomenon is not rare in itself according to the various ‘specialists’ aboard, it was nevertheless the first time for all of us that we’d witnessed such a spectacle at sea.

    Until tomorrow

    Nicolas Raynaud