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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

    04.04.2007

    Domaine du Mont d’Arbois still hanging in there.

    Coolness and confidence would sum up the atmosphere aboard Domaine du Mont d'Arbois, with Thierry Duprey du Vorsent still tucked in amongst the leading quartet in the BPE Trophy. The next 3 days promise to be decisive, before the trade winds take Domaine du Mont d'Arbois towards Marie Galante. Speculation and excitement are the order of the day...

    par Gitana

    Coolness and confidence would sum up the atmosphere aboard Domaine du Mont d’Arbois, with Thierry Duprey du Vorsent still tucked in amongst the leading quartet in the BPE Trophy. The next 3 days promise to be decisive, before the trade winds take Domaine du Mont d’Arbois towards Marie Galante. Speculation and excitement are the order of the day…

    Domaine du Mont d’Arbois and her skipper set a course to the south last night, in order to pre-empt the depression which is arriving and then negotiate an area of high pressure which will have to be either circled, or crossed as efficiently as possible. The distances between the first four in the BPE Trophy have thus been reduced over the last twenty hours, but their shared objective remains unchanged: to stay ahead and contain their pursuers who are arriving from the south borne by the trade winds.

    Thierry Duprey du Vorsent at 11:30 this morning…:

    A mid-term report “Things are going pretty well. Apart from my torn spinnaker in the first 24 hours of the race and losing the VHF aerial off the mast head, I’ve got no technical problems to speak of on Domaine du Mont d’Arbois, who’s still behaving perfectly. From the start, I opted for this route because I knew I wouldn’t be able to keep up with the ‘southerners’ in terms of pure speed and that their Figaro experience would give them a big advantage. In any case, I’m getting real satisfaction from testing myself against the others and analysing the weather files so as to exploit them to the max. But where pure sailing and speed sensations are concerned, it’s definitely not the same as on a multihull. With this boat, you need 25 or 30 knots of wind on a reaching course to get up to 13 or 14 knots. I’m still learning how best to handle her by making a few small errors, particularly in terms of my sail changes. But it’s getting better and better.”
     
    On the next 72 hours “I think they’ll be decisive. I have to get as much sleep as possible and eat well over the next twelve hours because after that, things are likely to get hairy. A depression with big squalls awaits us, followed by an area of high pressure with very variable winds in terms of intensity and direction. If I manage to deal with those two weather systems correctly and then hook up with the trade winds, that’ll be good. But if I get bogged down in the high pressure zone, those southerners will start to become a real threat. So from a tactical perspective, it’s really exciting.”

    On life on board “The boat is still a bit of a sieve… but I’m bailing her out. My water and food supplies are still enough to feed a regiment, but as for my fuel, it’s hard to tell how much is left because the boat is still at an angle. Apart from that, I’m sleeping ok and eating 3 times a day, almost like clockwork. The experience and stress I’ve gone thorough during my years on multihulls is standing me in good stead. If I’m sleeping and the boat suddenly gets hit by a 30-knot gust of wind, I nip out and release the sails without worrying. On a multihull, it’s a different story altogether...”
     
    On the end of the race “I’m still 100% focused on arriving at the other end with the boat in good condition. But getting through the next 3 days is my top priority at the moment. I’ll think about the finish nearer the time.”

    The Domaine du Mont d’Arbois onshore team. “They keep sending me messages letting me know they’re watching closely and it’s really nice to feel they’re right behind me. I’m going to meet up with them at Marie Galante and tell them all about this transat which, for me, is the longest solo voyage I’ve ever done.”

    Ranking of the BPE Trophy Wednesday 4th April at 03:00 pm :

    Place Bateau / Skipper Latitude Longitude Vit. Cap Dist. But Dist. 1er

    1 Gedimat – Armel Tripon / 34 16.15′ N 34 23.51′ W 7.4 186 1830.0 0.0
    2 Suzuki – Eric Defert / 35 11.39′ N 34 07.48′ W 6.1 188 1869.7 39.7
    3 TheoliaRobert Nagy – 32 30.96′ N 32 20.37′ W 6.5 264 1870.4 40.4
    4 Domaine du Mont d’Arbois – Thierry Duprey du Vorsent 32 58.68′ N 32 18.32′ W 6.1 263 1884.1 54.1
    5 Art Immobilier Construction – Daniel Dupont 33 34.28′ N 31 39.67′ W 6.6 276 1927.6 97.6
    6 A.ST Groupe – Marc Emig 28 35.80′ N 28 57.46′ W 2.3 298 1950.2 120.2
    7 Groupe Céléos – Ronan Treussart 28 34.81′ N 28 57.63′ W 1.6 276 1950.3 120.4
    8 Cercle Vert – Gildas Morvan 27 01.93′ N 28 25.19′ W 5.6 255 1953.3 123.3
    9 Luisina – Eric Drouglazet 28 44.67′ N 28 50.26′ W 2.4 269 1959.5 129.5
    10 Les Mousquetaires – Bertrand de Broc 28 44.49′ N 28 36.53′ W 3.8 198 1970.9 140.9