Hydroptere in speed configuration
Period: 2006 - 2009
Objective: Absolute speed records
Routes: Several world records and double absolute record in 2009
Hydrodynamic modifications: The profiles of the front foils, of the rear foil and of the rudder are modified for better results in speeds over 50 knots thanks to the reduction of cavitation. These phenomena which are dangerous for the boat increase with the speed. On the other hand, these modifications reduce the versatility of the boat in lower speed ranges or in rough sea conditions as the profiles, especially modified for pure speed, are significantly less tolerant to variations in the angle of attack.
Aerodynamic modifications: Adaptation of the rigging and sails surface only for wind conditions allowing very high speeds i.e. with a steady wind between 25 to 35 knots. Improvement of the platform’s general aerodynamics through the addition of streamlinings and plastic covers at different places of the platform. Improvement of the sails’ efficiency further to the study and digital modelling of the wind flow in contact with the sails and the platform.
Various modifications: Increase of the boat’s performance thanks to the possibility to incline the mast upwind and to the significant increase of the volume of water contained in the side ballast tanks (floats). Modification of the general ergonomics to adapt the platform to a more numerous crew (11 crew members instead of 6) for a better performance and faster adjustments.
Hydroptere in offshore configuration
Period: 2000 - 2005 / 2010 - 2011
Objective: Offshore training sessions, lab boat
Routes: Channel crossing faster than Blériot (2005), several European tours That’s the reference configuration of Hydroptere.
Hydrodynamic modifications: The profiles of the foils, the rudder and the rear foil are modified for a greater tolerance to speed and sea conditions’ changes.
Aerodynamic modifications: A mast of 28 meters, three options for reducing the mainsail, 3 headsails (Solent, staysail and ORC in order to reduce the surface) to be adapted to all wind forces. There is also a Genaker (large sail only dedicated to downwind sailing) tacked on the end of a jib boom (pole) of about 2.5 m.
Various changes: Rehabilitation of the ergonomics of the platform for easy manoeuvring with a smaller crew (changing the power of the winches, relocation of the reef hooks for example). Improvement of the "very relative comfort on board" for the crew’s well-being.
Hydroptere (« Pacific » configuration)
Objective: Pacific record (Los Angeles - Honolulu)
Routes: Sailing sessions off California and record attempt on the Transpac route
This configuration is based on the offshore configuration. The engineers of participate in the improvements of the boat, especially on the adjustment system of the rear foil.
Technological changes: Improvement of some advanced systems such as the adjustment of the rear foil or of the power steering for a more reactive steering, better adapted to the “Pacific” conditions.
Aerodynamic modifications: Extension of the jib boom ’s length(which is now 4.50 m long) and allows the use of a significantly larger Genaker and tacked further forward to help increase the angles to the real wind. A “Code 0” sail is added i.e. a large and light headsail which will allow to sail faster in lighter winds. More generally, Hydroptere has undergone an adaptation of the headsail (with the production of two new staysails) especially designed for the Pacific record's route.
Various modifications: loss of weight thanks to the replacement of the rudder’s support in aluminium with a carbon support. Loss of weight by the replacement of the motor used for propulsion/service with a smaller motor exclusively dedicated to “service” (battery charging for the different systems).