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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

    17.03.2010

    Gitana 11 in at the deep end.

    Four months to the day since going into her base in St Philibert, Brittany, for her winter refit, the maxi-trimaran Gitana 11 was relaunched late afternoon this Wednesday 17th March. The work carried out by the technical team from Baron Benjamin de Rothschild’s ocean racing stable, focused on erasing the youthful indiscretions of the giant to impro…

    par Gitana

    Four months to the day since going into her base in St Philibert, Brittany, for her winter refit, the maxi-trimaran Gitana 11 was relaunched late afternoon this Wednesday 17th March. The work carried out by the technical team from Baron Benjamin de Rothschild’s ocean racing stable, focused on erasing the youthful indiscretions of the giant to improve both performance and reliability. Back in her element, Gitana 11 is now all ready to attack the numerous training sessions on the schedule for skipper Yann Guichard.
    On shore, when Gitana 11 is being refitted, Yann Guichard entrusts the technical responsibility for the maxi-trimaran to William Fabulet. Boat captain for the multihull, William supervises a team of around fifteen people, ensures the consistency of the work schedule, as well as using his skills as a composite specialist to gladly lend a hand: “a number of parameters had changed when Gitana 11 was extended. As such we had to find the right adjustments so that the boat is as high performance and reliable as possible with a view to the Route du Rhum. Following last autumn’s test sails, Yann shared his thoughts on the experience with the architects and our in-house engineer, Bernard Pointet. These collective considerations guided the jobs list.”
     

    A review of the studious winter:

    Moving the foils forward

    These load-bearing planes made entirely of carbon and situated either side of the trimaran, enable her to reach high speeds whilst limiting the drag in the water and relieving the stresses on the floats.One of the big projects over the past four months has been to move the foil casings forward in order to improve the general equilibrium of the platform: “It was necessary to move them forward without modifying the shape of the hull. This massive task kept two technicians busy full-time for three months.” During this period, new appendages with an identical profile were manufactured at C3 Technologie to replace those temporarily on loan from Gitana 12.

    Adopting of a new image for the central and float rudders

    Essential to Gitana 11’s performance, as much through their position as their profile, the trimaran’s rudders have been considerably modified over the past few months. A revised shape and a new location have been required for the float rudders, to increase effectiveness and control of the boat at the helm. The central rudder, which benefited from a new shape to improve sensitivity at the helm, is a home-made product fabricated in the boatsheds at St Philibert.

    Setting up of the measuring instruments on the trimming equipment

    Pressure sensors have been installed on the hydraulic lines for example. The aim of this work, initiated by Pierre Bourcier and Benoit Piquemal, is to acquire and record a whole host of data, which once processed, will enable Gitana 11’s performance to be enhanced as well as improving safety onboard.
     
    In the nature of refits, weight saving was at the fore once again this winter and thanks to some new spectra trampolines, the platform has been slimmed down by nearly 70 kg. Finally, the technical team has made a thorough revision of the deck fittings, the hydraulic circuits and the onboard electrics.
     
    From the theory to practice
    Though returns to the yard remain essential for fine tuning these fabulous oceanic multihull prototypes, the team’s delight was evident this Wednesday when the 77 foot maxi-trimaran’s hit the water: “The timing of this winter refit was perfectly adhered to by the team. Everyone worked relentlessly for this to be the case and it’s always a great satisfaction to see Gitana 11 back in the water. On a personal level I can’t wait to put in my first tacks of 2010”admitted Yann Guichard, just metres from the blue bird.
     
    On Monday, Gitana 11 will cast off with her skipper and members of the shore crew involved in the main winter modifications. These short-handed test sails will enable everyone to get their bearings and, most importantly, validate the choices made on site. Very soon after that the Gitana Team helmsman hopes to set sail on his own to begin his solo training: “Of the sailors participating in the next Route du Rhum – La Banque Postale I am aware that I’m one of the least experienced solo sailors on this type of boat. However, we’re lucky to be on the water relatively early in relation to our future competitors, which will enable me to multiply the sessions on the water so I can discover and tame my steed” admitted Yann Guichard. 
     
    Besides his sailing programme on Gitana 11, the Breton sailor will also take the helm of an Extreme 40 for the second year running. Indeed a 40’ catamaran, rechristened Edmond de Rothschild Group, will rank among those participating in the 2010 Extreme Sailing Series Europe. The five dates currently registered in the championship calendar will be a chance for Yann Guichard and his three crew to confirm the potential expressed in 2009. For the record, they scored a very fine 2nd place in the final ranking. It should be noted that on this European circuit, the skipper of Gitana will be up against one of his future adversaries from the Atlantic, Franck Cammas. It will be the perfect opportunity to hone his skills in preparation for the start of the transatlantic race on 31st October 2010.