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Sailboat Specifications

Mamba 31

Masthead Sloop · Fin With Rudder On Skeg

Designed by Harry Becker/Rolf Magnusson/Bengt Karlsson · Built by Bk Marin · First built 1978

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LOA 30.68 ft  ·  Beam 10.07 ft  ·  Displacement 7,716.00 lb  ·  Sail Area 377.00 ft²  ·  Masthead Sloop  ·  Fin With Rudder On Skeg
About the Mamba 31 Sailboat

With limited documentation available, the Mamba 31 represents one of the more elusive sailboat designs from the early era of fiberglass construction. This 31-foot sailboat appears to have been produced in relatively small numbers, contributing to its current rarity in the used boat market. Based on typical design patterns from its era, the Mamba 31 likely features a moderate displacement hull with a fin keel configuration, making it suitable for coastal cruising and day sailing applications. The boat's proportions suggest it was designed as a family cruiser rather than a performance-oriented vessel, prioritizing interior volume and stability over racing characteristics. Prospective buyers should be aware that parts availability and technical support may be challenging due to the limited production history. However, this same rarity can make well-maintained examples appealing to sailors seeking something distinctive from the more common production boats of the period. The Mamba 31 would best suit sailors looking for coastal adventures and weekend cruising, though the limited available information makes thorough pre-purchase surveys particularly important. Those considering this boat should focus on structural integrity and the condition of through-hull fittings, as replacement parts may require custom fabrication.

Dimensions & Specifications
LOA (Length Overall) 30.68 ft / 9.35 m
LWL (Waterline Length) 26.25 ft / 8.00 m
Beam 10.07 ft / 3.07 m
Max Draft 5.41 ft / 1.65 m
Displacement 7,716.00 lb / 3,500 kg
Ballast 3,505.00 lb / 1,590 kg
Sail Area (Reported) 377.00 ft² / 35.02 m²
Design & Construction
Hull Type Fin with rudder on skeg
Rigging Type Masthead Sloop
Construction FG
Designer Harry Becker/Rolf Magnusson/Bengt Karlsson
Builder BK Marin
First Built 1978
Related Sailboats Monsun 31 · Omega 30 S · Dehler 31 · Finn Flyer 31 · Nicholson 31
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Frequently Asked Questions

What is the Mamba 31's sail area to displacement ratio?

The Mamba 31 has a Sail Area to Displacement ratio (SA/D) of 15.5. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.

What is the Mamba 31's comfort ratio?

The Mamba 31 has a Ted Brewer Comfort Ratio of 19.95. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.

Is the Mamba 31 safe for offshore sailing?

The Mamba 31 has a Capsize Screening Formula value of 2.04. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.

What is the hull speed of the Mamba 31?

The theoretical hull speed of the Mamba 31 is 6.87 knots, calculated from its waterline length.

How much does a Mamba 31 weigh?

The Mamba 31 has a displacement of 7,716.00 lb and a length overall (LOA) of 30.68 ft.

Who designed the Mamba 31?

The Mamba 31 was designed by Harry Becker/Rolf Magnusson/Bengt Karlsson, first built in 1978.