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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

    07.11.2007

    Over 25 knots with no foil!.

    On board Gitana 11, currently leading the way in the Transat Jacques Vabre, Lionel Lemonchois and Yann Guichard have been sailing without starboard foil for over 24 hours. But this mishap does not seem to be hindering the progress of the big blue trimaran, which was still flying along with mainsail and gennaker up at over 25 knots this morning. How…

    par Gitana

    On board Gitana 11, currently leading the way in the Transat Jacques Vabre, Lionel Lemonchois and Yann Guichard have been sailing without starboard foil for over 24 hours. But this mishap does not seem to be hindering the progress of the big blue trimaran, which was still flying along with mainsail and gennaker up at over 25 knots this morning. However, the crew are considering a possible stop to replace this important part.

    The foils are adjustable appendices which, at high speeds, allow the strain on the hull to be lessened and prevent it sinking down into the water. Consequently, Gitana 11 is currently handicapped when sailing on a port tack, i.e. when the strain on its starboard float needs to be relieved. Nevertheless, the trimaran boasts an enormous advantage: as her floats are bulkier than those of her rivals, they still stabilise her and thus allow her to sail without a foil. That said, sailing in this way represents an increased risk in terms of safety and of course reduces speed, which puts into perspective the performance of Gitana 11 and her crew over the past 24 hours. Moreover, Lionel Lemonchois admitted this morning to having been “very afraid on two occasions off Cape Finisterre!”
     
    The Gitana 11 skipper described the incident as follows: “Yesterday morning, 200 miles off Cape Finisterre, we heard a cracking sound coming from the float and rushed to have a look, We couldn’t see anything, but a few minutes later, there was another loud crack and we realised we had no starboard foil. We were first of all very disappointed, as the course we’d taken overnight had paid off in fine style. But we soon found our motivation again, thanks mainly to our technical team, who were truly exceptional, and we went back on the offensive again, which I don’t regret at all! When I see today what we’ve managed to achieve, I realise that our position was excellent and that we really did make the right choice. For the moment, we still don’t know if we’re going to stop to change the foil. It’ll be decision time in a few hours.”
     
    From a technical perspective, this possibility was anticipated by the Gitana Team, which is on standby to intervene if the skipper confirms that they’re going to make a stop

    Next press release at 05:30 pm

    Ranking at 8 am – ORMA Multihulls
    Boat Rank / Skipper  Latitude  Longitude Vit.  Cap Dist. But  Dist. 1st
    1 Gitana 11  36 44.02′ N  14 55.11′ W  22.2  198  3291.8  0.0
    2 Groupama  36 27.59′ N  13 43.23′ W  20.4  191  3303.6  11.8
    3 Banque Populaire  36 17.11′ N  13 01.87′ W  19.0  198  3310.3  18.5
    4 Sopra  38 05.07′ N  13 14.11′ W  17.4  186  3400.6  108.8
    Non localisé — Brossard BOURGNON Yvan/VINCENT Jacques