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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

    23.02.2008

    Turnabout.

    par Gitana

    For nearly two weeks, we’ve been experiencing a calmer platform, slipping along gently on the big blue. Since late yesterday morning though, we have been rediscovering a bouncing Gitana 13, ploughing with all its might into the short seas characteristic of the tradewinds. The transition between the exit from the Doldrums, at 12° North and the 18/22 knots of NE’ly wind, has been extremely quick since it was all over within the space of a watch. For some hours we sailed under one reef and staysail, but for the time being we’re carving out our course under full mainsail and solent, close hauled, virtually on a direct course towards San Francisco. The appraisal from the past 24 hours is 274 miles gained along the great circle route, whilst we’re reckoning on gaining a daily 300 to 350 miles over the coming days. We know what’s on the menu: upwind and more upwind lie in store for us over the last 1,600 miles of this Route de l’Or.

    This upwind sailing has generated the first damage since our departure 36 days ago. A headsail sheet ring attachment, used to trim the foresails, has pulled out of its support at the end of the track. This minor damage was quickly brought under control and involved just half an hour of sailing under mainsail alone. Sailing like this is also rather inconvenient: the atmosphere inside the hulls is suffocating as it’s now impossible to open the hatches and thus create the slightest draft. The water is still at 28° and the sun is making us white hot under our foulies, the wearing of which are nevertheless compulsory ‘since it makes us damp’. Fortunately, on deck, the ventilation isn’t lacking… This inconvenience is only fleeting however as, with our climb to the NNW, we’ll very quickly leave the tropical stickiness behind us and regain the pleasures of a more ‘temperate’ climate.

    Have a good weekend

    Nicolas Raynaud