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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

    16.08.2008

    The ‘agonies’ of the China Sea.

    par Gitana

    The China Sea is showing its summer face: a light S’ly breeze, direct from the equator, with general humidity and a stifling heat from mid-morning to early evening. We’re having to put in some southward tacks to close further on the equator in this oven of hot water which is already bordering on 30°C.

    From 1100 hours the helmsmen – who are in the worst possible position in these circumstances – take it in turns more often. The sun is really beginning to take its toll and they’re having to think of a hundred and one ways of avoiding being hit by the local weather phenomena: gloves, long-sleeved t-shirts and hats of all kinds. You could almost believe you were in an ‘equatorial adventurer’ style competition; it’s worth the trip!

    With each manœuvre physical movement costs a few litres of water. The seats in the shade, like the entrance to the cockpit or under the boom, are highly sought after. This is also the case for the bunks which are barely habitable, even with all the hatches open.

    During the night, the conditions are ideal but another trap awaits us under the cover of darkness. As soon as the water becomes more shallow, the sea is lit up by hundreds of fishermen’s lights which are carried off into space, impossible to separate. Navigation lights, radar, binoculars, bearing compass…  those on watch are using all their safety gear. This takes up a vast part of the night as the boat is forced to slalom through the mass of drifting nets. We wonder what the fish do to survive… aboard we refer to it as ‘the Great Wall of China’.

    It’ll take a few more days of cooking and patience before we catch up with the E’ly tradewinds which blow copiously across the north of the Indian Ocean as far as the waters of the Java Sea; almost a week to round to the south of Borneo whose landscape is such that it prevents the establishing of an overly powerful tradewind. In October, with the powerful NE’ly flow which sweeps the land, we would have been propelled towards Java in 3 days!

    Dominic Vittet