VIPER 640

VIPER 640 photo VIPER 640 drawing

Sailboat Specifications


Hull Type:
Lifting Keel
Rigging Type:
Fractional Sloop
LOA:
21.08 ft / 6.43 m
LWL:
19.08 ft / 5.82 m
Beam:
8.17 ft / 2.49 m
S.A. (reported):
252.00 ft2 / 23.41 m2
Draft (max):
4.49 ft / 1.37 m
Draft (min):
1.83 ft / 0.56 m
Displacement:
750 lb / 340 kg
Ballast:
262 lb / 119 kg
S.A./Disp.:
48.92
Bal./Disp.:
34.93
Disp./Len.:
48.20
Construction:
FG
First Built:
1996
# Built:
400
Builder:
Viper Boats (USA)/Rondar (UK)
Designer:
Brian Bennett

Sailboat Calculations

S.A./Disp.:
48.92
Bal./Disp.:
34.93
Disp./Len.:
48.20
Comfort Ratio:
3.59
Capsize Screening Formula:
3.60
S#:
N/A

Rig and Sail Particulars

I:
21.98 ft / 6.70 m
J:
7.48 ft / 2.28 m
P:
25.62 ft / 7.81 m
E:
10.07 ft / 3.07 m
S.A. Fore:
82.21 ft2 / 7.64 m2
S.A. Main:
129.00 ft2 / 11.98 m2
S.A. Total (100% Fore + Main Triangles)
211.20 ft2 / 19.62 m2
S.A./Disp. (calc.):
41.00
Est. Forestay Len.:
23.22 ft / 7.08 m

Sailboat Links

Notes

Rondar Raceboats was appointed the class builder in 2005.
Asym. spin. area 425 sf.
Keel is fastened with 2 bolts while sailing. Can be raised for trailering and launched in 2 feet of water. .
2 piece carbon spar.

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