Viper 640

Viper 640
Development
Designer Brian Bennett
Location United States
Year 1996
No. built 400
Builder(s) Viper Boats
Rondar Raceboats
Boat
Boat weight 750 lb (340 kg)
Draft 4.49 ft (1.37 m) daggerboard down
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 type Outboard motor
Hull appendages
Keel/board type bulb daggerboard keel
Ballast 262 lb (119 kg)
Rudder(s) transom-mounted rudder
Rig
Rig type Bermuda rig
I (foretriangle height) 21.98 ft (6.70 m)
J (foretriangle base) 7.48 ft (2.28 m)
P (mainsail luff) 25.62 ft (7.81 m)
E (mainsail foot) 10.07 ft (3.07 m)
Sails
Sailplan Fractional rigged sloop
Mainsail area 129.00 sq ft (11.984 m2)
Jib/genoa area 82.21 sq ft (7.638 m2)
Spinnaker area 425 sq ft (39.5 m2)
Total sail area 211.20 sq ft (19.621 m2)
Racing
PHRF 99 (average)

The Viper 640 is an American trailerable sailboat, that was designed by Brian Bennett for racing and first built in 1996.[1][2]

The Viper 640 is an accepted World Sailing class boat.[3]

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][4]

Design

Viper 640s racing
Viper 640, showing the open transom

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]

The boat has a draft of 4.49 ft (1.37 m) with the daggerboard extended and 1.83 ft (0.56 m) with it retracted, allowing ground transportation on a trailer.[1]

The boat may be optionally fitted with a small outboard motor for docking and maneuvering.[1]

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).[5]

See also

References

  1. 1 2 3 4 5 Browning, Randy (2018). "Viper 640 sailboat specifications and details". sailboatdata.com. Retrieved 30 May 2018.
  2. ↑ Browning, Randy (2018). "Brian Bennett". sailboatdata.com. Retrieved 30 May 2018.
  3. 1 2 Rondar Raceboats (2018). "Rondar Viper 640 - Specification - Now a World Sailing Class!". www.rondarboats.com. Retrieved 30 May 2018.
  4. ↑ Browning, Randy (2018). "Rondar Raceboats". sailboatdata.com. Retrieved 30 May 2018.
  5. ↑ InterVisionSoft LLC (2018). "Sailboat Specifications for Viper 640". Sailing Joy. Retrieved 30 May 2018.
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