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VIPER 640

VIPER 640 built by Viper Boats (USA)/Rondar (UK) and designed by Brian Bennett. Her first hull was built in 1996 with an overall lengh of 6.43 m or 21.08 ft long

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VIPER 640 Sailboat Specifications​

Features

Overall Length (LOA) m / ft6.43 m / 21.08 ft
Builder(s)Viper Boats / Rondar
Designer(s)Brian Bennett
BrandViper
CountryUnited States
Hull TypeLifting Keel
Number of Hulls Built400
First Hull Built1996
Rigging TypeFractional Sloop
UnsinkableNo
TrailerableNo
Ballast Ratio26.43

Dimensions

Overall Length (LOA) 6.43 m / 21.08 ft
Waterline Length (LWL)5.82 m / 19.08 ft
Beam (width)2.49 m / 8.17 ft
Draft1.47 m / 4.83 ft
Light Displacement (MLC) 318 kg / 700 lb
Maximum Displacement318 kg / 700 lb
Ballast Weight84 kg / 185 lb

Performance

Capsize Screening Formula (CSF)3.68
Comfort Ratio3.35
Displacement-Length Ratio (DLR)44.99
Ballast Ratio26.43
Sail Area to Displacement51.22

Above Deck

Estimated Forestay Length7.08 m / 23.22 ft
Reported Sail Area23.41 m² / 252.00 ft²
Total Sail Area20.29 m² / 218.36 ft²
Mainsail Area11.90 m² / 128.10 ft²
I21.67 ft * 6.61 m
J8.33 ft * 2.54 m
P25.62 ft * 7.81 m
E10.00 ft * 3.05 m
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