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):
4.83 ft / 1.47 m
Draft (min):
1.83 ft / 0.56 m
Displacement:
700 lb / 318 kg
Ballast:
185 lb / 84 kg
S.A./Disp.:
51.22
Bal./Disp.:
26.43
Disp./Len.:
44.99
Construction:
FG
First Built:
1996
# Built:
400
Builder:
Viper Boats (USA)/Rondar (UK)
Designer:
Brian Bennett

Sailboat Calculations

S.A./Disp.:
51.22
Bal./Disp.:
26.43
Disp./Len.:
44.99
Comfort Ratio:
3.35
Capsize Screening Formula:
3.68

Rig and Sail Particulars

I:
21.67 ft / 6.61 m
J:
8.33 ft / 2.54 m
P:
25.62 ft / 7.81 m
E:
10.00 ft / 3.05 m
S.A. Fore:
90.26 ft2 / 8.39 m2
S.A. Main:
128.10 ft2 / 11.90 m2
S.A. Total (100% Fore + Main Triangles)
218.36 ft2 / 20.29 m2
S.A./Disp. (calc.):
44.39
Est. Forestay Len.:
23.22 ft / 7.08 m

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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