X-402

Sailboat specifications

The X-402 is a 39’8” (12.09m) racer-cruiser sailboat designed by Niels Jeppesen (Denmark). She was built between 1984 and 1990 by X-Yachts (Denmark) with 79 hulls completed.

X-402's main features

Model: X-402
Hull type: Monohull
Category: Racer-cruiser sailboat
Sailboat builder: X-Yachts
Sailboat designer: Niels Jeppesen
Country: Denmark
Construction: Hull and deck: GRP (glass reinforced polyester)
Number of hulls built: 79
First built hull: 1984
Last built hull: 1990
Appendages: Keel : fin without bulb
Helm: Single helm wheel
Rudder: Single spade rudder
Unsinkable: No
Trailerable: No
Former French navigation category: 1
Standard public price ex. VAT (indicative only): N/A €

X-402's main dimensions

Hull length: 39’ 8”12.09 m
Waterline length: 33’ 2”10.11 m
Beam (width): 12’ 11”3.94 m
Draft: 7’ 5”2.25 m
Light displacement (M_LC): 13228 lb6000 kg
Ballast weight: 6834 lb3100 kg

X-402's rig and sails

Upwind sail area: 681 ft²63.3 m²
I iFore triangle height (from mast foot to fore stay top attachment): 52’ 4”15.95 m
J iFore triangle base (from mast foot to bottom of forestay): 15’ 5”4.7 m
P iMainsail hoist measurement (from tack to head): 45’ 11”14 m
E iMainsail foot measurement (from tack to clew): 13’ 1”4 m
Rigging type: Sloop Marconi fractional
Mast configuration: Keel stepped mast
Rotating spars: No
Number of levels of spreaders: 2
Spreaders angle: Swept-back
Spars construction: Aluminum spars
Standing rigging: 1x19 strand wire continuous

X-402'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.: 206 ft²/T19.17 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.: 164
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.: 52 %
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.: 7.72 knots