Viper 640
The Viper 640 is an American trailerable sailboat, that was designed by Brian Bennett for racing and first built in 1996.
The Viper 640 is an accepted World Sailing class boat and the official one-design boat of the Gulf Yachting Association for its Capdevielle Series.Production
The boat was originally built by Viper Boats in the United States and then in 2005 Rondar Raceboats of the United Kingdom was named the official class manufacturer. 400 examples had been completed by 2018.Design
The Viper 640 was designed to combine the planing performance of a dinghy with the stability of a keelboat. The result is a small recreational planing keelboat, built predominantly of fiberglass, with carbon fiber spars. It has a fractional sloop rig, a plumb stem, an open transom, a transom-hung rudder and a lifting fin daggerboard-style keel, with a weighted bulb, with of lead ballast. The keel is retained in the down position with two bolts while sailing. The design displaces and is equipped with an asymmetrical spinnaker of for downwind sailing.
The boat has a draft of with the daggerboard extended and with it retracted, allowing ground transportation on a trailer.
The boat may be optionally fitted with a small outboard motor for docking and maneuvering.
The design has a PHRF racing average handicap of 99 with a high of 111 and low of 96. It has a hull speed of.
