VIPER 640

Main

Appendages
Lifting Keel
Construction
FG
First built hull
1996
Hull type
Monohull
Model
VIPER 640
Sailboat builder
Viper Boats
Sailboat designer
Brian Bennett

Dimensions

Ballast weight
84.0
Beam
2.49
Displacement
318.0
Draft
1.47
Max Draft
1.47
Min Draft
0.56
Overall length
6.43
Waterline length
5.82

Sails

E
3.05
Est. Forestay Length
7.08
Fore area
8.39
I
6.61
J
2.54
Mainsail area
11.9
P
7.81
Total area
23.41

Engine

Performance

Ballast ratio
26.43
Capsize Screening Formula
3.68
Comfort Ratio
3.35
Critical hull speed
5.85
Displacement-length ratio (DLR)
44.99
Upwind sail area to displacement
51.22

Accomodation

The VIPER 640 is a high-performance one-design sailing boat designed for racing. It was first introduced in 1996 and has gained popularity among sailors around the world. Here are some key features and characteristics of the VIPER 640:

1. Design: The VIPER 640 was designed by Brian Bennett, who aimed to create a fast, fun, and affordable boat that could be easily sailed by a small crew. The boat has a sleek and modern design with a low-profile hull and a large sail area.

2. Length and Weight: The VIPER 640 is 21 feet (6.4 meters) long and weighs around 750 pounds (340 kilograms). Its lightweight construction allows for quick acceleration and high speeds.

3. Crew Size: The boat is designed to be sailed by a crew of three, making it a great option for small teams or families. The crew consists of a helmsman, a mainsail trimmer, and a jib trimmer.

4. Rigging: The VIPER 640 features a fractional rig with a carbon fiber mast and boom. The boat has a large, powerful mainsail and a self-tacking jib, which simplifies the sailing process and allows for quick maneuvers.

5. Performance: The VIPER 640 is known for its exceptional performance on the water. It is a planing boat, meaning it can reach high speeds and ride on top of the water rather than plowing through it. The boat is responsive and agile, making it exciting to sail in various wind conditions.

6. Class Association: The VIPER 640 has a strong class association that organizes events and regattas around the world. The class is known for its competitive racing and friendly community, attracting both experienced sailors and newcomers to the sport.

7. Accessibility: The VIPER 640 aims to be an accessible racing boat, both in terms of cost and ease of use. The boat is relatively affordable compared to other high-performance racing boats, and its design allows for easy transportation and launching.

Overall, the VIPER 640 is a popular choice for sailors looking for a fast and exciting racing experience. Its sleek design, high-performance capabilities, and competitive class association make it a thrilling option for both experienced and amateur sailors.

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