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Sailboat Specifications

Hullmaster 31

Masthead Sloop · Long Keel

Designed by Edward S. Brewer · Built by Hullmaster Boats, Ltd. (Can) · First built 1973

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LOA 31.25 ft  ·  Beam 9.25 ft  ·  Displacement 10,350.00 lb  ·  Sail Area 455.00 ft²  ·  Masthead Sloop  ·  Long Keel
About the Hullmaster 31 Sailboat

Designed by Edward S. Brewer and built by Canadian manufacturer Hullmaster Boats Ltd. from 1973 to 1979, this 31-foot cruising sailboat represents classic 1970s sailing yacht philosophy with its emphasis on seaworthiness and comfort over speed. The long keel configuration provides excellent directional stability and a forgiving sailing character, making it particularly well-suited for coastal cruising and short-handed sailing. With a displacement of 10,350 pounds and substantial ballast ratio, the Hullmaster 31 offers the kind of solid, predictable motion at sea that appeals to cruising sailors who prioritize comfort and safety. The masthead sloop rig with 455 square feet of sail area provides adequate power for most conditions while remaining manageable for smaller crews. Her beam of 9.25 feet creates reasonable interior volume within the compact 31-foot length overall. The impressive comfort ratio of 32.73 and conservative capsize screening value of 1.7 indicate this yacht's suitability for extended coastal passages and potentially offshore work in the hands of experienced sailors. While not designed for racing, the Hullmaster 31 excels as a traditional family cruiser that prioritizes seakeeping ability and crew comfort over outright performance.

Dimensions & Specifications
LOA (Length Overall) 31.25 ft / 9.53 m
LWL (Waterline Length) 22.67 ft / 6.91 m
Beam 9.25 ft / 2.82 m
Max Draft 4.67 ft / 1.42 m
Displacement 10,350.00 lb / 4,695 kg
Ballast 4,350.00 lb / 1,973 kg
Ballast Type Lead
Sail Area (Reported) 455.00 ft² / 42.27 m²
Design & Construction
Hull Type Long Keel
Rigging Type Masthead Sloop
Construction FG
Designer Edward S. Brewer
Builder Hullmaster Boats, Ltd. (CAN)
First Built 1973
Last Built 1979
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Engine & Accommodations
Engine Make Faryman
Engine Type Diesel
Horsepower 12
Fuel Capacity 15 gals / 57 L
Water Capacity 34 gals / 129 L
Frequently Asked Questions

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

The Hullmaster 31 has a Sail Area to Displacement ratio (SA/D) of 15.38. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.

What is the Hullmaster 31's comfort ratio?

The Hullmaster 31 has a Ted Brewer Comfort Ratio of 32.73. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.

Is the Hullmaster 31 safe for offshore sailing?

The Hullmaster 31 has a Capsize Screening Formula value of 1.7. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.

What is the hull speed of the Hullmaster 31?

The theoretical hull speed of the Hullmaster 31 is 6.38 kn knots, calculated from its waterline length.

How much does a Hullmaster 31 weigh?

The Hullmaster 31 has a displacement of 10,350.00 lb and a length overall (LOA) of 31.25 ft.

Who designed the Hullmaster 31?

The Hullmaster 31 was designed by Edward S. Brewer, first built in 1973.