X-73

Sailboat specifications

The X-73 is a 72’ (21.95m) fast cruising sailboat designed by Niels Jeppesen (Denmark). She was built between 2001 and 2001 by X-Yachts (Denmark) with 2 hulls completed.

X-73's main features

Model: X-73
Hull type: Monohull
Category: Offshore fast cruising 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: 2
First built hull: 2001
Last built hull: 2001
Appendages: Keel : L-shaped keel (with bulb)
Helm: Twin helm wheels
Rudder: Twin spade rudders
Unsinkable: No
Trailerable: No
Standard public price ex. VAT (indicative only): N/A €

X-73's main dimensions

Overall length: 73’ 7”22.43 m
Hull length: 72’21.95 m
Waterline length: 63’ 1”19.24 m
Beam (width): 19’ 8”6 m
Draft: 10’ 6”3.2 m
Light displacement (M_LC): 87964 lb39900 kg
Ballast weight: 30865 lb14000 kg

X-73's rig and sails

Upwind sail area: 2588 ft²240.4 m²
Downwind sail area: 4684 ft²435.2 m²
Mainsail area: 1401 ft²130.2 m²
Jib area: 1186 ft²110.2 m²
Gennaker area: 3283 ft²305 m²
Code 5 area: 3283 ft²305 m²
I iFore triangle height (from mast foot to fore stay top attachment): 92’ 4”28.12 m
J iFore triangle base (from mast foot to bottom of forestay): 27’ 11”8.5 m
P iMainsail hoist measurement (from tack to head): 86’ 11”26.5 m
E iMainsail foot measurement (from tack to clew): 28’ 11”8.8 m
Rigging type: Sloop Marconi fractional
Mast configuration: Keel stepped mast
Rotating spars: No
Number of levels of spreaders: 3
Spreaders angle: Swept-back
Spars construction: Carbon fiber spars

X-73'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.: 222 ft²/T20.59 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.: 401 ft²/T37.27 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.: 159
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.: 35 %
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.: 10.65 knots