Viper Boats 640
Fractional Sloop · Lifting Keel · First built 1996
A high-performance fractional sportboat featuring a carbon spar and lifting keel, designed for rapid, tactical racing
Designed by Brian Bennett.
- LOA
- Beam
- Draft (max)
- Displacement
- Ballast
- Hull type
- Lifting Keel
Is it for you?
Character
Where this design lands on the numbers a shopper trusts — read straight from her own ratios.
Her light displacement on a beamy beam gives 3 — a quick, lively motion that feels every wave.
At 3.68 she sits above the 2.0 line — beamy for her weight, and happiest coastal.
45 — light for her waterline, so she is easily driven and quick to accelerate.
44.4 — a lot of sail for her weight; powered-up and eager, a real performer.
26% of her weight is ballast — on the tender side; she'll heel readily and want a reef sooner.
Light and lively — happiest day-sailing and coastal-hopping in settled weather.
- Lighter than ~95% of boats her size on file
Compared with 605 boats of the same type within a quarter of her length.
The record
Full specifications
The complete reference set — tap any figure to switch between metric and imperial.
Boats like this, on the water
Nobody has filmed this one — but these are close.
Comparable boats the fleet has on camera: same type, within a quarter of her length. Open the boat, or watch the video — a timestamp means she only appears in passing.
The family
Related models
The designs closest to hers — usually the rest of the builder's range, sometimes the same hull sold under another name.
Keep looking
Nothing filmed of this one yet
Two ways to keep looking — both search what the fleet has actually recorded.
The newsletter
New boats, new stories, from everywhere.
One email from the fleet — boats newly added, videos newly analyzed. No noise.