| Main features | X-312 Fractional rigging |
Model | X-312 |
Version | Fractional rigging |
Hull type | Monohull |
Category | Cruiser-racer sailboat |
Sailboat builder | X-Yachts |
Sailboat designer | |
Country | Denmark |
Construction | GRP (glass reinforced polyester): Sandwich fiberglass polyester with galvanized steel frame |
Number of hulls built | 64 |
First built hull | 1989 |
Last built hull | 1994 |
Appendages | Keel : fin without bulb |
Helm | Single tiller |
Rudder | Single spade rudder |
Unsinkable | No |
Trailerable | No |
| Main dimensions | X-312 Fractional rigging |
Overall length | 30’ 4”9.25 m |
Hull length | 30’ 4”9.25 m |
Waterline length | 24’ 7”7.5 m |
Beam (width) | 9’ 10”3 m |
Draft | 5’ 7”1.7 m |
Light displacement (MLC) | 7397 lb3355 kg |
Ballast weight | 3638 lb1650 kg |
Ballast type | Cast iron / lead fin |
| Rig and sails | X-312 Fractional rigging |
Upwind sail area | 567 ft²52.63 m² |
Downwind sail area | 910 ft²84.55 m² |
Mainsail area | 290 ft²26.95 m² |
Genoa area | 276 ft²25.68 m² |
Solent area | 240 ft²22.26 m² |
Jib area | 184 ft²17.12 m² |
Stormjib area | 61 ft²5.7 m² |
Symmetric spinnaker area | 620 ft²57.6 m² |
I iFore triangle height (from mast foot to fore stay top attachment) | 34’ 10”10.6 m |
J iFore triangle base (from mast foot to bottom of forestay) | 10’ 6”3.2 m |
P iMainsail hoist measurement (from tack to head) | 37’ 1”11.3 m |
E iMainsail foot measurement (from tack to clew) | 13’ 6”4.13 m |
Rigging type | Sloop Marconi 7/8 |
Mast configuration | Keel stepped mast |
Rotating spars | No |
Number of levels of spreaders | 2 |
Spreaders angle | 0 ° |
Running backstays | 1 set(s) |
Spars construction | Aluminum spars |
| Performances | X-312 Fractional rigging |
IOR rating iIOR, or International Offshore Rule, was a measurement rule system used internationally for ocean racing. It allows boats of different sizes and designs to race each other fairly. Therefore, by comparing these values, we can have an indication of the relative speed of 2 boats. | 23.5 |
HN (French rating) iHN or "Handicap Nationale" is an empirical rating system used in France allowing various monohulls, of different sizes and designs, to race each other fairly. It is particularly suitable for cruiser and cruiser-racer. Therefore, by comparing these values, we can have an indication of the relative speed of 2 boats. | 18.0 |
Upwind sail area to displacement iThe ratio sail area to displacement is obtained by dividing the sail area by the boat's displaced volume to the power two-thirds.The ratio sail area to displacement can be used to compare the relative sail plan of different sailboats no matter what their size. Upwind: under 18 the ratio indicates a cruise oriented sailboat with limited performances especially in light wind, while over 25 it indicates a fast sailboat. | 243 ft²/T22.61 m²/T |
Downwind sail area to displacement iThe ratio sail area to displacement is obtained by dividing the sail area by the boat's displaced volume to the power two-thirds.The ratio sail area to displacement can be used to compare the relative sail plan of different sailboats no matter what their size. | 430 ft²/T39.99 m²/T |
Displacement-length ratio (DLR) iThe Displacement Length Ratio (DLR) is a figure that points out the boat's weight compared to its waterline length. The DLR is obtained by dividing the boat's displacement in tons by the cube of one one-hundredth of the waterline length (in feet).The DLR can be used to compare the relative mass of different sailboats no matter what their length: a DLR less than 180 is indicative of a really light sailboat (race boat made for planning), while a DLR greater than 300 is indicative of a heavy cruising sailboat. | 225 |
Ballast ratio iThe Ballast ratio is an indicator of stability; it is obtained by dividing the boat's displacement by the mass of the ballast. Since the stability depends also of the hull shapes and the position of the center of gravity, only the boats with similar ballast arrangements and hull shapes should be compared.The higher the ballast ratio is, the greater is the stability. | 49 % |
Critical hull speed iAs a ship moves in the water, it creates standing waves that oppose its movement. This effect increases dramatically the resistance when the boat reaches a speed-length ratio (speed-length ratio is the ratio between the speed in knots and the square root of the waterline length in feet) of about 1.2 (corresponding to a Froude Number of 0.35) . This very sharp rise in resistance, between speed-length ratio of 1.2 to 1.5, is insurmountable for heavy sailboats and so becomes an apparent barrier. This leads to the concept of "hull speed".The hull speed is obtained by multiplying the square root of the waterline length (in feet) by 1.34. | 6.65 knots |
| Auxiliary engine | X-312 Fractional rigging |
Engine(s) | 1 inboard engine |
Engine(s) power (min./max.) | 9 HP / 17 HP |
Fuel type | Diesel |
Fuel tank capacity | 11.9 gal45 liters |
| Accommodations and layout | X-312 Fractional rigging |
Cockpit | Closed aft cockpit |
Cabin(s) | 2 |
Berth(s) (min./max.) | 4 / 6 |
Head(s) | 1 |
Freshwater tank capacity | 31.7 gal120 liters |
Maximum headroom | 5’ 11”1.8 m |