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X-312 Mast head rigging is a Cruiser-racer sailboat built by X-Yachts and designed by Niels Jeppesen. Her first hull was built in 1989 with an overall lengh of 9.25 m or 30.4 ft long and a Keel stepped mast mast configuration.

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X-312 MAST HEAD RIGGING Sailboat Specifications​


Overall Length (LOA) m / ft9.25 m / 30.4 ft
Designer(s)Niels Jeppesen
VersionMast head rigging
categoryCruiser-racer sailboat
Hull TypeMonohull
Number of Hulls Built64
First Hull Built1989
Last Hull Built1994
AppendagesKeel fin without bulb
HelmSingle tiller
RudderSingle spade rudder
CockpitClosed aft cockpit
Ballast TypeCast iron / lead fin
Rigging TypeSloop Marconi masthead
Mast LayoutKeel stepped mast
Number of Cabin(s)2
Number of Head(s)1
Freshwater Tank Capacity lt/gal120 L / 31.7 gal
Ballast Ratio48.65


Overall Length (LOA) 9.25 m / 30.4 ft
Hull Length9.25 m / 30.4 ft
Waterline Length (LWL)7.5 m / 24.7 ft
Beam (width)3 m / 9.10 ft
Draft1.7 m / 5.7 ft
Light Displacement (MLC) 3355 kg / 7397 lb
Maximum Displacement3357 kg / 7400 lb
Ballast Weight1650 kg / 3638 lb


Critical Hull Speed6.65 knots
Capsize Screening Formula (CSF)2.00
Comfort Ratio20.94
Displacement-Length Ratio (DLR)225
Ballast Ratio48.65
Sail Area to Displacement18.34
Upwind Sail Area to Displacement22.61 m²/T / 243 ft²/T
Downwind Sail Area to Displacement39.99 m²/T / 430 ft²/T

Above Deck

Mast LayoutKeel stepped mast
Rotating SparsNo
Number of Levels of Spreaders2
Spreaders Angle0 °
Spars ConstructionAluminum spars
Estimated Forestay Length11.07 m / 36.33 ft
Reported Sail Area40.32 m² / 434.00 ft²
Total Sail Area40.30 m² / 433.74 ft²
Upwind Sail Area50.68 m² / 546 ft²
Downwind Sail Area89.63 m² / 965 ft²
Mainsail Area20.53 m² / 221 ft²
Genoa Area30.15 m² / 325 ft²
I38.10 ft * 11.84 m
J11.4 ft * 3.45 m
P33.6 ft * 10.2 m
E11.6 ft * 3.5 m

Engine Room

Engine(s)1 inboard engine
Fuel typeDiesel
Fuel Tank Capacity45 L / 11.9 gal

Below Deck

Maximum Headroom5.11 ft * 1.8 m
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