The Viper 640 is a 2 to 4 person,
high-performance sports boat. It is FUN, FAST, EASY and AFFORDABLE. The
Viper makes high performance sailing available to everyone. The open
transom bails water instantly, even in extreme conditions. The Viper
is simple, clean, and effective, with no protruding hardware and everything
placed for efficiency. The Viper is light enough to be towed behind a
compact car and simple enough to be rigged and sailed in under a half
hour. The boat can be launched from a hoist or ramp. The 640 is strict
one-design with no changes permitted to the boat as supplied by the class
approved builder. The only option is sails, supplied by class approved
sailmakers and strictly controlled through class rules, which encourages
the development of tuning techniques with the help of the best sailors
- Fine entry, long narrow bow and pronounced cross sectional flare in
the midsection results in low drag.
- Bulb keel and wide flared beam at the cockpit provides superior stability
and enables a powerful sail plan.
- The combination of fine entry, low drag, and powerful sail plan make
the Viper superior in light air or chop.
The Viper will start planing
any similar class (SB3, Open 5.70, K6, U20, Melges 20 & 24 etc).
- The wide cockpit, superior stability and a sturdy carbon
mast make it fast and secure in big breeze.
- The hull shape means that the Viper does not go 'bow down' planing
downwind at high speeds.
The 2:1 ratchet-controlled jib sheet runs through Carbo T2s on the clew to
low-profile pinstop cars for trim angle adjustments. In addition to moving
the cars forward to round the foot of the jib, Viper sailors can also improve
light-air performance by removing the top batten to keep the leech open.
Jib Halyard Fine-Tune
For cranking up the luff tension in fresh wind, the Viper's jib halyard
is deflected through a 8:1 fine-tune. The double-ended system uses Micro
Carbo Cams with X-Treme Angle fairleads, making it easy for the forward
crew to adjust without leaving the rail.
The Viper cockpit is very clean with a gnav in place of a traditional vang.
The new 8:1 Harken gnav replaces the slider system with a captive bearing
car designed for compression loads. The Harken HC8418 utility car removes
most of the friction to make the system more powerful, reducing the need
for a very high purchase, and making it far easier to use under load.
Viper 640 Sailboat Parts and Equipment
We at Layline strive to be your source for Viper 640 Sailboat Parts and Equipment and all sailboat hardware, rigging, and sailing gear. With our focus on one design and handicap racing we can offer advice and reviews of what you need to compete. If you need any assistance selecting the appropriate Viper 640 Sailboat Parts and Equipment
please contact us. Our crew is ready to help!