ADH Inotec
Diam 3

The Diam 3 is a catamaran designed under the Formula 18 rules. When launched in 2003, she mades a strong impression with a tenth place during the World Championship in Belgium. In 2004 Damien Seguin / Frederic Moreau won the France Championship of Raid and in 2005 and 2006 the crew Vauchel Thibault Camus / Jérémie Lagarrigue confirms these nice performances by winning back to back the France Championship.

Compared to Diam 2 performances are very close upwind but downwind marked an improvement. The structure has been redesigned for greater rigidity and higher beams to reduce the effect of the waves. The construction, almost artisanal, is a guarantee of quality but limits the flow of production, so she is a rather exclusive catamaran.

See the Diam 3's specifications on

Main Features

ShipyardADH Inotec
ModelDiam 3
Sailboat typeBeach catamaran
ClassFormula 18
DesignerBertrand Desjoyeaux
Building years (first/last)2003 / 2007
PredecessorDiam 2
CE regulationC-2 / D-4
ConstructionSandwich foam/fiberglass/polyester
Appendage typeDaggerboards
Rudder bladeDouble transom hung rudders
RudderSingle tiller
Main dimensions
Hull length18.1 ft
Beam over all8.5 ft
Draft3.1 ft
Mast length29.8 ft
Light displacement397 lbs

Rig and sails

Rig typeFractional Sloop with rotating mast
Rig materialMast and boom in Aluminum
Number of rows of spreader1
Spreader anglePushing (diamond)
Spinnaker typeAssymmetrical spinnaker on bowsprit
Upwind sailarea228 ft²
Downwind sailarea409 ft²
Mainsail area183 ft²
Jib area45 ft²
Spinnaker area226 ft²


Upwind sailarea / displacement1264.8 ft²/Ton
Downwind sailarea / displacement2272.4 ft²/Ton
Trapezes2 set(s)

SCHRSSmall Catamaran Handicap Rating System: rating introduced by ISAF in 1992 to allow to different catamarans to race together.

rating (2013)

Portsmouth-YardstickPortsmouth Yardstick is an empirical system of handicapping used for small sailboat (dinghies included).


Auxiliary engine

BrandNo engine

Based on specification2005

Website :

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