Fractionnal rigging

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The X-312 was presented by X-Yachts, in 1989, as the successor of the X-95. It uses more modern hull form and more conventional design, away from the guidelines of Half Tonner; for example no more engine in the fore part of the saloon but a Saildrive under the companionway. The wish is to provide a little more comfort inside. On deck, the orientation is the same, and this is the first X-Yachts to use a stern integrated bathing platform.

The X-312 was available in two versions with a mast head rigging or a fractional rigging (7/8) favoring the mainsail. This version was equipped with a pair of runners.

See the X-312's specifications on

Main Features

VersionFractionnal rigging
Sailboat typeCruising-racing monohull
DesignerNiels Jeppesen
Building years (first/last)1989 / 1994
Number built64
SuccessorX-Yachts X-302
ConstructionSandwich fiberglass/polyester, with galvanised steel frame
Appendage typeTrapezoidal keel
Ballast typeCast iron / lead fin
Rudder bladeSingle under hull rudder
RudderSingle tiller
Main dimensions
Length over all30.3 ft
Hull length30.3 ft
Waterline length24.6 ft
Beam over all9.8 ft
Draft5.6 ft
Light displacement7397 lbs
Ballast3638 lbs

Rig and sails

Rig typeFractional Sloop (7/8)
Rig materialMast and boom in Aluminum
Number of rows of spreader2
Spinnaker typeSymmetrical spinnaker
Upwind sailarea567 ft²
Downwind sailarea910 ft²
Mainsail area290 ft²
Genoa area276 ft²
Working jib area240 ft²
Jib area184 ft²
Stormsail area61 ft²
Spinnaker area620 ft²

PMainsail hoist measurement (from tack to head)

37.1 ft

EMainsail foot measurement (from tack to clew)

13.5 ft

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

34.8 ft

JFore triangle base (from mast foot to bottom of forestay)

10.5 ft

LLGenoa hoist measurement (from tack to head)

35.9 ft

LPGenoa perpendicular measurement from clew to luff.

15.1 ft

SLSymmetrical spinnaker hoist measurement (from tack to head)

35.1 ft

SMWSymmetrical spinnaker width

18.9 ft


Ballast ratio49.2 %
Upwind sailarea / displacement168.9 ft²/Ton
Downwind sailarea / displacement271.3 ft²/Ton
HN (French rating)19.0
IOR rating23.5 ft

Auxiliary engine

Type1 x 2001
Engine power1 x 9 hp
Power max (optional)1 x 17 hp
Fuel capacity11.9 gal
Fuel typeDiesel
Transmission typeSaildrive
Propeller typeTwo-blade folding propeller


Number of cabin2
Number of berth (max./min.)6 / 4
Number of shower room1
Fresh water capacity31.7 gal
Headroom max5.9 ft

Based on specification1990

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