Nacra Inter 18

The Nacra Inter 18 is the first American Formula 18. Equipped with high ratio appendages, she is really performing upwind and maintains good speed downwind. However it is quite difficult to run on wavy seas because of the lack of volume on the fore hull. The Harken fittings and Vinylester foam sandwich construction are of high quality.

See the Nacra Inter 18's specifications on

Main Features

ModelNacra Inter 18
Sailboat typeBeach catamaran
ClassFormula 18
DesignerGino Morrelli
Pete Melvin
Building years (first/last)1996 / 2002
SuccessorNacra F18
CE regulationC-2 / D-4
ConstructionSandwich foam/fiberglass/vinylester
Appendage typeDaggerboards
Rudder bladeDouble transom hung rudders
RudderSingle tiller
Main dimensions
Hull length18.1 ft
Waterline length18.0 ft
Beam over all8.5 ft
Mast length29.5 ft
Light displacement397 lbs

Rig and sails

Rig typeFractional Sloop with rotating mast
MastFore beam stepped mast
Rig materialMast and boom in Aluminum
Standing rigging material1x19 strand wire
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

PMainsail hoist measurement (from tack to head)

28.0 ft

IFore triangle height (from mast foot to fore stay attachement)

18.8 ft


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 specification2001

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