| Designer | Brian Bennett |
|---|---|
| Location | United States |
| Year | 1996 |
| No built | 400 |
| Builder | Viper Boats Rondar Raceboats |
| Draft | 4.49 ft (1.37 m) daggerboard down |
| Displacement | 750 lb (340 kg) |
| Hull type | Monohull |
| Construction | Fiberglass |
| Loa | 21.08 ft (6.43 m) |
| Lwl | 19.08 ft (5.82 m) |
| Beam | 8.17 ft (2.49 m) |
| Engine | Outboard motor |
| Keel type | lifting keel with weighted bulb |
| Ballast | 262 lb (119 kg) |
| Rudder type | transom-mounted rudder |
| Rig type | Bermuda rig |
| I | 21.98 ft (6.70 m) |
| J | 7.48 ft (2.28 m) |
| P | 25.62 ft (7.81 m) |
| E | 10.07 ft (3.07 m) |
| Sailplan | Fractional rigged sloop |
| Sailarea main | 129.00 sq ft (11.984 m2) |
| Sailarea headsail | 82.21 sq ft (7.638 m2) |
| Sailarea spin | 425 sq ft (39.5 m2) |
| Sailarea total | 211.20 sq ft (19.621 m2) |
| Phrf | 99 (average) |
The Viper 640 is an recreational keelboat, that was designed by Brian Bennett and first built in 1996.[1][2][3]
The Viper 640 is an accepted World Sailing class boat[4] and the official one-design boat of the Gulf Yachting Association for its Capdevielle Series.[5]
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.[1][3][6]
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 220 lb (100 kg) of lead ballast. The keel is retained in the down position with two bolts while sailing. The design displaces 750 lb (340 kg) and is equipped with an asymmetrical spinnaker of 425 sq ft (39.5 m2) for downwind sailing.[1][3][4]
The boat has a draft of 4.49 ft (1.37 m) with the lifting keel extended and 1.83 ft (0.56 m) with it retracted, allowing ground transportation on a trailer.[1][3]
The boat may be optionally fitted with a small outboard motor for docking and maneuvering.[1][3]
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 5.85 kn (10.83 km/h).[3][7]
Reception
Cruising World magazine named the design Overall Boat of the Year and top Performance One-Design of 2002, stating "the panelists agreed that the Viper is inherently simple, offers quality construction at a great price, and is extremely fun to sail. An attractive looking boat, the Viper invites a wide range of sailors to an equally wide range of sailing."[8]
References
- ^ Browning, Randy (2018). "Viper 640 sailboat specifications and details". sailboatdata.com. Archived 15 April 2021 at the Wayback Machine. Retrieved 30 May 2018.
- ^ Browning, Randy (2018). "Brian Bennett". sailboatdata.com. Archived 15 April 2021 at the Wayback Machine. Retrieved 30 May 2018.
- ^ Sea Time Tech, LLC (2022). "Viper 640". sailboat.guide. Archived 25 March 2022 at the Wayback Machine. Retrieved 25 March 2022.
- ^ Rondar Raceboats (2018). "Rondar Viper 640 - Specification - Now a World Sailing Class!". www.rondarboats.com. Archived 4 December 2020 at the Wayback Machine. Retrieved 30 May 2018.
- ^ "GYA Selects Viper 640 As New Capdevielle Boat!!". Viper640.org. 2015. Archived 6 February 2020 at the Wayback Machine. Retrieved September 9, 2015.
- ^ Browning, Randy (2018). "Rondar Raceboats". sailboatdata.com. Archived 10 September 2020 at the Wayback Machine. Retrieved 30 May 2018.
- ^ InterVisionSoft LLC (2018). "Sailboat Specifications for Viper 640". Sailing Joy. Retrieved 30 May 2018.[dead link]
- ^ Alison, Betsy (5 August 2002). "Viper 640 - This fun boat is responsive and quick". Cruising World. Archived 25 March 2022 at the Wayback Machine. Retrieved 15 March 2022.