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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

    13.02.2008

    The clock is ticking.

    par Gitana

    Four weeks at sea already, yet the only thing we’re really aware of is that San Francisco is still far off! During the first part of our trip, most of our progress was “useful,” whereas our current ascent northward is nowhere near as efficient. Yesterday we covered 500 miles, but the net gain was “only” 395 miles. Here’s the analysis from Dead Cloud, the nickname now used by the whole team for our navigator Dominic Vittet. “Since Cape Horn, if we pulled the string tight, we would be at least 350 miles farther north.” This nickname stems from a casual conversation about the Doldrums. Dead Cloud argued that there are clouds that generate wind and others are devoid of wind—so they’re “dead.” As you can see, we have fun with what we have onboard.

    Today, Tuesday, was a little gloomy to be honest. Not a spot of blue or a ray of sun, only grayness over a lifeless sea, apart from a group of porpoises early this morning. The wind is more stable than we’re accustomed to. So in the absence of any maneuvers, except for a few jibes, we’re sailing under full sail toward the equator. Some adjustments here and there, but everything is happening at the helm. The theme there is: go fast and bear off as much as possible. This is tricky balance, always difficult, and it demands our full concentration. But the clock is ticking, and that provides sufficient motivation even if we never talk about it.

    This pace of around 400 miles per day should continue until 16 February when the southeasterly trade winds are expected to weaken a bit more. Even though the Doldrums still lie far ahead, we are already talking about how we’re going to approach them. Our plan to push farther east than normal—closer to land—means that we’re going to take a risk. We’ll have more to say about this topic, and things could certainly change in the meantime. We won’t be there for around 10 days, but a successful crossing depends on proper preparation well in advance.

    Goodbye

    Nicolas Raynaud