Maxi Edmond de Rothschild
GITANA 17Given name
|Category Flying Maxi-Multihull||Loa 32 m|
|Weight (displacement) 15.5 tons||Beam 23 m|
|Air draught 37 m||Sails North Sails en 3Di|
|Upwind sail area 450 m²||Downwind sail area 650 m²|
|Appendages 6||Types T-foil float rudders (2)
L-shaped foils (2)
daggerboard on the central hull (1)
T-foil rudder on central hull (1)
|Launch 17 July 2017||ENERGIE diesel engine with generator, wind generators|
Designed by naval architect Guillaume Verdier and his team in collaboration with the Gitana design office, the Maxi Edmond de Rothschild will be part Archimedean boat (submerged hull), part flying craft. She is offshore racing’s first maxi-multihull designed to fly in the open ocean.
The precursor of a new generation of giants of the seas, this boat features innovative, purposeful planing hulls beneath the waterline, which are a far cry from those used on the current fleet of oceanic multihulls.
Everything about the forms of the floats and the central hull shouts flight. She is equipped with the very latest architectural and technical advances in terms of appendages, with T-foil rudders and L-shaped foils measuring over 5.4m in height. With everything geared towards flight, a great deal of care has gone into the aerodynamics of the platform. The forms of the beams in particular testify to this, as does the integration of the living space/ cockpit between the two beams.
Going by the name Gitana 17, she has been devised, developed and built with the focus on solo sailing, but she’ll also be the ideal boat for major record attempts in crewed configuration.
Launched in July 2017, the construction of this multihull, which has already made her mark on the Gitana saga, required more than 170,000 man-hours, including 35,000 hours of studies.
Naval architects : Guillaume Verdier, Hervé Penfornis, Romaric Neyhousser, Morgane Schlumberger, Véronique Soulé (calculs de fluide), Jamie France, Bobby Kleinschmidt (architecture navale / VPP), Pure Design & Engineering, Romain Garo (CFD), Len Imas (CFD)
Constructors : Gitana (maître d ́ouvrage / owner), Re Fraschini (foils / L-shaped foils), C3 Technologies (cloisons et appendices / bulkheads & appendages), Lorima (mât / mast), Multiplast (plate-forme / platform), Persico (casquette / cuddy)
Suppliers : Heol Composites, Harken, Pixel sur Mer, Écritures, L'Atelier sur Mer
Livery : Creation by Jean-Baptiste Epron according to an original work designed specifically for this project by the artist Cleon Peterson. Commissariat : Hugo Vitrani, curator Palais de Tokyo.
These are what inspired the project. These streamlined ‘pieces of carbon’ absorbed hours of sailing on the Multi70 Edmond de Rothschild, a genuine test laboratory, and a series of calculations for the engineers from Verdier´s team. Objective : improving efficiency and minimising braking, in other words, going ever faster according to the sea state. The choice focused on L-shaped foils with XXL dimensions and T-foil rudders, which will play the role of li$ing surfaces. These T-foil rudders will be retractable so as not to impinge on the boat´s ability to slip along and to minimise the risk of breakage of the windward float. Therefore, with the foil and rudder in action, the leeward float will be supported by these appendages, relieving the pressure on the central hull and enabling the Maxi Edmond de Rothschild to fly above the oceans despite weighing more than 15 tonnes.
Everything´s connected! The use of these massive li$ing surfaces (L-shaped foils and T-foil rudders) translate into high floats and a platform with maximum stiffness. As a result, the crossbeams connected to the main hull remain rectangular and non-curved so as to optimise the effect. “The additional weight means a gain in reliability” explains Sébastien Josse. The team of naval architects and engineers from the Gitana design office, which is constantly striving for exemplary aerodynamics, has found a novel ‘fairing’ solution for these straight crossbeams. The result is unmistakable: these plane-shaped wings bonded onto the forward and a$ beams, together with the sail plan, provide the optimum aerodynamic effect.
Flat-bo"omed, like the floats, for supremely powerful li$, with a moderate beam of significant height to be"er shield it from the sea, the main hull has a ‘tulip’ shape. More flared at the top, it accommodates the pod, which is where the skipper and his crew work.
Studied in great depth by the Gitana design office and its skipper Sébastien Josse, the cockpit, the nerve centre aboard the Maxi Edmond de Rothschild, remains ultraergonomic. The pod, or cuddy, added onto the central hull, enables a highly protected and very efficient living space to be created. Sleek and streamlined to reduce windage and retain the boat´s aerodynamic form, this cuddy extending out to the a$ beams is equipped with side windows carefully positioned to provide an optimum view of the sail plan. Spartan, the interior of the central hull with a carbon bo"om provides li"le in the way of comfort. Just enough to devour a freeze-dried meal and fall into the land of nod for a few minutes...
Starting out from the primary physical principles of the object”, such was the starting point for the studies by Guillaume Verdier´s team. Floats with a flat bo"om create li$, thus preventing them from being sucked downwards, increasing their ability to fly and ensuring excellent stability in heavy seas. As is the case on the America´s Cup cra$, the Maxi Edmond de Rothschild is equipped with three planing hulls with inverted bows, enabling her to remain above the water and ‘pierce’ the waves. These flat bo"oms require great solidity and uniform monolithic carbon construction, guaranteeing unfailing stiffness… Somewhat surprising, the height of the floats is entirely governed by the incorporation of L-shaped foils, with the resulting torsion generated (when they´re in action) requiring a greater surface area to ‘withstand’ the stresses.
From Archimedean to flight mode, instructions for use
The trimming of the flaps, the angle of inclination of the foils, the hydraulics circuit... from Archimedean to flight mode, the Gitana Team offers you the instructions for use by dissecting the main phases of take-off using 3D animation.
Scénario : Gitana SA Animation 3D : Olivier Michon Copyright : Gitana SA