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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

    18.11.2013

    Edmond de Rothschild expected into Itajaí this afternoon.

    The two 70’ trimarans are negotiating their final hours of racing in the Transat Jacques Vabre. Positioned 127.6 miles from the finish this Monday at the 1000 GMT ranking, Sébastien Josse and Charles Caudrelier are still leading the way to Itajaí, where they’re expected into port late this afternoon (middle of the afternoon Brazilian time). This mo…

    par Gitana

    The two 70’ trimarans are negotiating their final hours of racing in the Transat Jacques Vabre. Positioned 127.6 miles from the finish this Monday at the 1000 GMT ranking, Sébastien Josse and Charles Caudrelier are still leading the way to Itajaí, where they’re expected into port late this afternoon (middle of the afternoon Brazilian time). This morning they boasted a 58.5-mile lead over Oman Air Musandam. They owe their slight edge to their perfect handling of the cold front, which took shape across their course yesterday afternoon. That said, this final day at sea will be far from restful as the wind is easing over the end of the course and the Gitana Team duo will have to remain focused on getting the boat making headway as they make landfall on Brazilian shores.

    Yesterday was a very dangerous day. Whilst the 70’ trimarans were beginning to hang a right at the entrance to the bay of Rio, the forecast weather situation appeared to harbour a great many hurdles. The passage of a large cold front further spiced up proceedings: “There was a bit of tension before we were able to tackle this phenomenon as there were a lot of random elements to deal with in their negotiation of the bay. However, Sébastien and Charles managed the situation very well. On entering the front, they hit a very big wind shift, the breeze moving round virtually 180°, with a very strong breeze which went from 4 to 30 knots in a matter of minutes. They just had the time to furl in the gennaker and head off upwind in the other direction! It wasn’t at all easy to deal with but it enabled us to traverse the front fairly sharpish. Oman, which was positioned further to the north at the time, seemed to take more time to escape this band of storms,” Antoine Koch explained.

    The trimaran fitted out by Baron Benjamin de Rothschild is currently sailing on port tack and is making headway to the south-west in an easing easterly wind. Sébastien Josse and Charles Caudrelier will hunt down a north-easterly rotation of the wind. From that point, they’ll have to put in one last gybe, which will finally enable them to set a direct course to the finish. “The boat has slowed considerably over the past few hours, but it wasn’t forecast. They are the first to enter into a zone where there is less wind and Oman Air should close on them again between now and the finish. There’s a small migratory zone of high pressure, which is trailing behind the front and is situated to the south-east of Itajaí. It is this system, which is generating these lighter winds. They will have to remain on their guard and focused all the way to the finish!” explained Edmond de Rothschild’s onshore router.

    “The finish isn’t long now but it’s a bit complicated; the weather isn’t great. There isn’t a lot of wind and we’re expecting a transition tomorrow. The weather model is a bit lost and even though we have a good lead, it’s never over,” admitted a somewhat prudent Charles Caudrelier yesterday evening. Indeed, as hardened sailors, Sébastien and Charles are all too aware of the adage, which states that nothing is a done deal until the finish line is crossed.

    Extracts from the radio session between Charles Caudrelier and the Transat Jacques Vabre press HQ yesterday evening:  “I’ve already been to Itajaí: either there is wind… or there isn’t! The conditions are calm, so we’re getting as much rest as we can to handle the end of this complicated course. We’re trying to conserve our energy. These boats are high performance, the weather was good and everything has gone well sailing double-handed ultimately. These boats are fabulous. They go twice as fast as the others. We had planned a course time of 12 days at best. However, all in all, we’ve encountered conditions, which are favourable to performance: fair winds, seas that aren’t overly big, good linkage from one system to the next, with an average of 30 knots at times. Sébastien and I know each other well, we’ve sailed well without making mistakes… so far at least. We’re knackered; we never stop as you can’t afford to put a foot wrong on these boats. You don’t let go of the helm when you’re on watch, even to drink a coffee. You’re steering the whole time, because you can’t go flat out with the automatic pilot. Sometimes you alternate every hour. We’ve really been pushing the boat. A scare? When we saw Oman Air – Musandam closing on us.”

    Ranking for Monday 18 November at 0930 GMT
    1. Edmond de Rothschild (Josse-Caudrelier) 127.6 miles from the goal / 20kt average over 2hrs
    2. Oman Air-Musandam (Gavignet-Foxall) 58.5 miles from the leader / 8.8kt average over 2hrs