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After-fins

Why have we installed after-fins on the boat?
Up until now Adrien has shown a strong tendency to "head-up" when travelling fast in a cross-wind. ("heading-up" means that the boat has a tendency to turn towards the direction of the wind).
To prevent her changing course, I was forced to use a lot of helm, which is wearing on the helmsman and the automatic pilots.
To allow for this problem, I had to limit the speed by reducing the sail area so that the automatic pilot could continue to steer. This isn't very logical in a racing boat.
From now on, I will lower the leeward fin. It is angled at 6° relative to the boat's axis. The more Adrien "heads-up", the more I will lower the fin. This should greatly ease the strain on the main rudder which will continue to steer the boat but more easily than before.

Technical specifications
Length 25,70m
Width 5,40 m
Draft 4,60 m
Weight at the departure 30 t
Ballast 11,8 t
Keel appendage 2.5 t + gas-oil 0.3 t
Main sail 165 m2
Genoa 170 m2
Solent 85 m2
Staysail 30 m2
Light spinnaker 420 m2
Heavy spinnaker 310 m2

Boat designers
Gilles VATON (BGV)
 
Bureau d’etude Franck de RIVOYRE  

Interveners
Aluminium Hull PECHINEY 5083
Plasma arc cut by ALMET (Nantes)
Built at Chantiers GAMELIN (La Rochelle)
Preparation POLYPAT Vendée (Port Bourgenay)
Mast, Boom, carbon spinnaker pole Espace COMPOSITE
Steering gear JP3
Lead ballast Fonderie VRIGNAUD
Keel appendage Acier SOLLAC
Manufactured by ARNO (Dunkerque)
Riggings ROD BSI et NAVTEC EPI
Ropes COUSIN
Marlinespike Blew STOUB
Sails INCIDENCES et TAROT (spi lourd)
Electronics SIMRAD
Pilots SIMRAD (ex Robertson)
Security PLASTIMO
Batteries OLDHAM (700 AH)
Engines VOLVO PENTA ( 2 x 50 CV saildrive)
avec 2 x 2 alternateurs 70 AH
Communication 1 standard B
1 mini M
2 standards C
1 IRRIDIUM
Energy 3 wind generators + 9 solar cells
Insurance NEMARF / assurermonbateau.com
Bank ACC LOCAVIA CITY BANK
Routing Pierre LASNIER (Météomer)
Offshore clothing GUY COTTEN
Sportswear ARMOR LUX
Shoes, Boots ELTY-SERMI
Home Harbour PORT OLONA ( Les Sables d'Olonne)
Paints BOERO
Blocks Nautos
Tracks and cars ANTAL
Winches Andersen
Carbon furlers FACNOR
Accommodation CP CHARLES
Glue SIKAFLEX
Insulation LEROY MERLIN
Heating SANI Chauffage
Computers IBM
Software MAXSEA + NOCTURNE

Ship assistants
Technical Giovanni BRUNO et Emeric PERAUD
Electricity Yann LE LIVEC
Plumbing Jean BILLIET
Electronics Jean Marc BollMann
And all the volunteers who did not spare their time !!!

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