VIPER 640
Fractional Sloop • Lifting Keel • Built 1996
Dimensions
- LOA
- 21.08 ft
- LWL
- 19.08 ft
- Beam
- 8.17 ft
- Max Draft
- 4.83 ft
- Min Draft
- 1.83 ft
- Displacement
- 700 lbs
- Ballast
- 185 lbs
Performance Ratios
- Capsize Ratio ⓘ
- 3.68 (use caution offshore)
- SA/D Ratio ⓘ
- 51.1
- D/L Ratio ⓘ
- 45
- Ballast Ratio ⓘ
- 26.4%
Sail Plan
- Sail Area
- 252 sq ft
- I
- 21.67 ft
- J
- 8.33 ft
- P
- 25.62 ft
- E
- 10 ft
Construction
- Hull Type
- Lifting Keel
- Rig Type
- Fractional Sloop
- Hull Material
- FG
- Ballast Type
- —
Production
- First Built
- 1996
- Last Built
- —
- Number Built
- 400
Notes: Rondar Raceboats was appointed the class builder in 2005.\nAsym. spin. area 425 sf.\nKeel is fastened with 2 bolts while sailing. Can be raised for trailering and launched in 2 feet of water. .\n2 piece carbon spar.