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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

    07.09.2008

    Dreams and realities.

    par Gitana

    After a calm night yesterday, the tradewind is flowing very gently across the smooth, marine blue sea. From the moment the sun warms us, a collective frenzy seizes hold of the crew. It’s a big clean-up in both hulls! Orchestrated by Ronan, a big burst of bleach whitens the companionways, heads and galley again. Each person is forced to tidy ‘his room’, namely his bunk and his two boxes measuring around 50 cm wide. It’s an opportunity to rediscover all kinds of things that were all too soonabandoned in the past gales: socks, T-shirts…
    Once the dirty laundry has been gathered, the cleaning done and the hoods opened wide, the odour of the companionways drops a notch, which according to each hull, is certainly no luxury for those opposite… You are sensitive to the odour of others, not your own.

    Lionel has another project this Saturday morning. Benefiting from sailing without the spray, which is rare, he begins the repairs on the float. With white work overalls, grinder in hand, he attacks the carbon and the dust flies as far as the cockpit. Soon, with the help of David as préparateur, he adds resin, astride of the crack and five layers of carbon are cleverly orientated. The outer skin is now watertight. Whilst the epoxy cures, we are deprived of the large gennaker for three hours to remove any pressure on the structure and avoid distorting the ‘dressing’. The lamination of the interior skin will take a few days to dry out, prisoner of the sandwich, the time for it to drain.

    With the help of Rony, Léo – in charge of onboard supplies –extracts the bags of food for the second half of the voyage from the beams in which they are stored. He makes the most of it to recount the pots of jam and observes that despite his immense management efforts, the remainder will be largely insufficient…

    Zolive, to whom you’re better off entrusting a computer rather than a screwdriver, is shifting the satellite reception from the various apparatus on the ‘East Atlantic’ zone. Following that there is evidently a bug in the onboard means of transmission for a large part of the day, which ‘isn’t serious’ of course. Finally, after having checked everything, tested it, turned off all the onboard computers and then turned them all on again for several hours, everything returns to order. It’s a great moment. No longer having any means to receive weather information during this period, I’m making the most of the time to visit the two aft compartments, traversed by the rudder stocks, to scoop out the few litres which are inevitable in these areas.

    In short, we’re tackling our third ocean with a ‘new’ boat. The guys have worked well and we gybed this afternoon just three miles from the coast of Namibia. It was a great spectacle of dunes, beige and ochre rocks and brown and rust-coloured cliffs. An arch of gigantic stone, little valleys sprinkled with rare clumps of vegetation, mountains far away and two very small houses. It’s another world. Whilst flying along at 30 knots on turquoise waters, our minds wander. From one sea to another, the miles file past, the dreams stack up and the voyages wait their turn.

    A final gybe and we plunge, due west, to the heart of the Atlantic. Yesterday evening, it was doubtless our last albatross. Farewell to the southern winter, farewell Africa. Bound for St Helena…

    Dominic Vittet