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    VIPER 640

    Hull
    Lifting Keel
    Rigging
    Fractional Sloop
    LOA
    21,08 ft i.e. 6,43 m
    LWL
    19,08 ft i.e. 5,82 m
    Sail Area
    252 ft² i.e. 23,41 m²
    Beam
    8,17 ft i.e. 2,49 m
    Displacement
    700 lb i.e. 318 kg
    Ballast
    185 lb i.e. 84 kg
    Max Draft
    4,83 ft i.e. 1,47 m
    Construction
    Fiberglass
    Ballast Type
    N/A
    Last Built
    400
    Maker
    N/A
    Design
    Brian Bennett
    Blue Water Value Rank (BWVR)
    7920
    Blue Water Surf Value Rank (BWSVR)
    8123
    Capsize Comfort Value Rank (CCVR)
    8307
    Capsize Screening Formula Rank (CSFR)
    8292
    Comfort Ratio Rank (CRR)
    8218
    Make
    N/A
    Type
    N/A
    Fuel
    N/A
    Water
    N/A
    Headroom
    N/A
    S.A. / Displ.
    51,22
    Bal. / Displ.
    26,43
    Displ. / Length
    44,99
    Hull Speed
    5,85 kt
    Pounds/Inch Immersion
    556,99 pounds/inch

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