A perfect balance of dinghy and keelboat.
The Viper 640 Sailboat
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Rigging Manual
Product Details
Viper 640
“It’s a perfect balance of dinghy and keelboat”
The Viper 640 is a two to four 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 comfortable, 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 boat 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 and sailmakers.
Specifications
Length 21 ft
Beam 8’2"
Weight749 lb. including 220lb ballasted keel
Hull Construction Cored Composite
MastCarbon fiber
BoomAluminum
Sail Area677 sq ft
Draft1'10" with keel up and 4"6" with keel down
Ideal Crew Weight500-600 lbs
Crew 2-4
BuiltUSA
Photos
Videos
Use Cases
The Viper 640 was designed as a high-performance, two-to-four-person sportboat that bridges the gap between a dinghy and a keelboat. It was built for speed, fun, and affordability, offering a quick-planing, stable, and easy-to-rig racer that is both accessible to amateurs and thrilling for experienced sailors.
Key design elements include:
Performance: A lightweight fiberglass hull with a high-aspect carbon fiber rig and a large asymmetrical spinnaker for exciting planing.
Stability & Safety: Features a 220 lb bulb keel for stability and an open transom for immediate water drainage, combining the feel of a dinghy with the security of a keelboat.
Versatility & Portability: Simple to rig in under 30 minutes, it can be launched via ramp or hoisted and is designed to be towed easily behind a car.
One-Design Racing: Strictly controlled design rules encourage tactical racing focused on skill rather than boat development.
Layout: Spacious, clean cockpit designed for 3–4 crew members with ergonomic comfort for intense hiking
Community: The Viper 640 Class is known for it’s competitive natural with amateur to Champion non-paid Pro Sailors, but the class is ultimately built around the amazing camaraderie amongst it’s sailors.