X-372 Fractional rigging

Sailboat specifications

The X-372 is a 36’4” (11.05m) cruiser-racer sailboat designed by Niels Jeppesen (Denmark). She was built between 1987 and 1992 by X-Yachts (Denmark) with 120 hulls completed. The Fractional rigging version features 7/8 rig and running backstays allowing finer sail trimming options and lower IOR rating.

The X-372 is as well listed, on Boat-Specs.com, in Mast head rigging version (see all the versions compared).

X-372's main features

Model: X-372
Version: Fractional rigging
Hull type: Monohull
Category: Cruiser-racer sailboat
Sailboat builder: X-Yachts
Sailboat designer: Niels Jeppesen
Country: Denmark
Construction: GRP (glass reinforced polyester):
Sandwich fiberglass polyester with galvanized steel frame
Number of hulls built: 120
First built hull: 1987
Last built hull: 1992
Appendages: Keel : fin without bulb
Helm: Single tiller (helm wheel in option)
Rudder: Single spade rudder
Unsinkable: No
Trailerable: No
Standard public price ex. VAT (indicative only): N/A €

X-372's main dimensions

Overall length: 37’ 8”11.48 m
Hull length: 36’ 4”11.05 m
Waterline length: 29’ 6”9 m
Beam (width): 11’ 8”3.57 m
Draft: 6’ 7”2 m
Light displacement (M_LC): 11244 lb5100 kg
Ballast weight: 4850 lb2200 kg
Ballast type: Cast iron / lead fin

X-372's rig and sails

Upwind sail area: 885 ft²82.2 m²
Downwind sail area: 1396 ft²129.7 m²
Mainsail area: 445 ft²41.3 m²
Genoa area: 440 ft²40.9 m²
Solent area: 294 ft²27.3 m²
Stormjib area: 94 ft²8.7 m²
Symmetric spinnaker area: 952 ft²88.4 m²
Rigging type: Sloop Marconi masthead
Mast configuration: Keel stepped mast
Rotating spars: No
Number of levels of spreaders: 2
Spreaders angle: 0 °
Running backstays: 2 set(s)
Spars construction: Aluminum spars

X-372's performances

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.: 299 ft²/T27.74 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.: 471 ft²/T43.78 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.: 198
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.: 43 %
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.: 7.28 knots