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.

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.

19.08.2008

Magical night aboard Gitana 13.

par Gitana

After setting out from Hong Kong last Thursday to tackle the seventh and final record of its 2008 campaign, The Tea Route, the maxi-catamaran in the colours of the LCF Rothschild Group passed offshore of the island of Borneo in south-east Asia this Tuesday 19th August. Yesterday, Lionel Lemonchois and his men were preparing to cross a zone of light winds, but the mysteries of the weather had an entirely different scenario in store for them. According to the latest forecasts, Gitana 13 will be sailing in the southern hemisphere from tomorrow.

Continuing its descent towards the Java Sea and the Sunda Strait, Gitana 13 last night passed just off the island of Natuna, the main island in the Indonesian archipelago of the same name. It was a strategic passage which required a route to be selected aboard the maxi-catamaran: “After a great deal of hesitation, we opted to round to the east of the island of Natuna. This decision enabled us to bear away (distancing oneself from the set of the wind) a little and sail a little more openly. For the first time since leaving Hong Kong, we were no longer upwind, which was greatly appreciated by the whole crew. It was a fabulous night: flat seas, full moon and a boat which finally had a bit more pace” explained Dominic Vittet.

The first sight of land since Hong Kong, Natuna proved to be a fine spectacle for the ten sailors aboard: “We passed within 7 miles of the island and were able to admire the landscape as a result. Of particular interest was a volcano situated along the eastern seaboard, which we gradually discovered through the clouds.”

However, in addition to the beauty of the area, Natuna had another nice surprise for the men aboard the maxi-catamaran equipped by Baron Benjamin de Rothschild. Indeed, the air flow from the monsoon (SW’ly wind) was diverted by the landfall, which brought about a steady NW’ly breeze for nearly 6 hours. It was an unexpected change in direction, but one which the crew of Gitana 13 was able to fully reap the benefits off in order to gain some precious miles in the record attempt.

For Lionel Lemonchois and his nine crew, the objective of the day is to gain the maximum of southing in order to hit the SE’ly tradewinds situated around the equator. The sailors of Gitana Team are likely to make the zero degrees of latitude over the course of tonight. From then on, the 33 metre maxi-catamaran will be able to lengthen its stride in its bid to make the Indian Ocean.

The archipelago of Natuna
The Indonesian archipelago of Natuna is made up of 272 islands situated in the South China Sea, between the Malaysian peninsula and the island of Borneo. The archipelago is one of the most northerly parts of Indonesia.

Borneo
Spanning 736,000 km², Borneo is the largest island of SE Asia. It is divided into four zones: the Sabah and the Sarawak, which are dependant on eastern Malaysia, the small independent state of the sultanate of Brunei to the north and the Kalimantan which belongs to southern Indonesia and covers the majority of the island.

Some figures

Gitana 13 left Hong Kong on Thursday 14th August at 07h55’32” (UT)
OnTuesday 19th August at 0715 UT, Gitana 13 was sailing at 02°13.80 N/108°23.63 E

Watch No1: Lionel Lemonchois (Skipper / watch leader / helmsman) / Olivier Wroczynski (trimmer /head of computers and power) / David Boileau (Bowman / head of deck fittings)

Watch No.2: Ludovic Aglaor (watch leader / helmsman) / Laurent Mermod (trimmer) / Ronan Le Goff (Bowman)

Watch No.3: Pascal Blouin (Watch leader / helmsman) / Ronan Guérin (trimmer) / Léopold Lucet (No.1, head of supplies and doctor)

Outside the watch system: Dominic Vittet (navigator)

Retourner aux articles

Heritage