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Rasmus 31
Designer: Olle Enderlein  ·  Builder: Hallberg-Rassy  ·  First built: 1973
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About the Rasmus 31

Designed in Scandinavia, the Rasmus 31 carries a reputation as a sturdy and capable bluewater cruiser that punches well above its size class. Built with the demanding conditions of Nordic waters in mind, this compact sailboat was engineered for serious offshore passagemaking rather than casual weekend sailing, earning it a loyal following among sailors who prioritize seaworthiness over luxury. The Rasmus 31 is perhaps best known for its robust construction and conservative, functional design philosophy. Its hull form reflects a traditional approach that prioritizes stability and safety in challenging conditions, making it a sensible choice for coastal and offshore cruising alike. The boat handles rough weather with confidence, a trait that has made it particularly popular among solo and short-handed sailors looking for a dependable bluewater platform on a modest budget. For prospective buyers, the Rasmus 31 represents an honest, no-frills cruising yacht with a track record that speaks for itself. Those willing to embrace its utilitarian character will find a capable and trustworthy companion for extended passages and coastal adventures.

Core Dimensions
LOA (Length Overall) 31.00 ft / 9.45 m
LWL (Waterline Length) 24.75 ft / 7.54 m
Beam 10.00 ft / 3.05 m
Max Draft 4.40 ft / 1.34 m
Displacement 9,500.00 lb / 4,309 kg
Sail Area (Reported) 414.00 ft² / 38.46 m²
Design & Construction
Hull Type Fin Keel
Rigging Type Masthead Sloop
Construction FG
Designer Olle Enderlein
Builder Hallberg-Rassy
First Built 1973
Related Sailboats ["Hallberg Rassy 31" · "Rival 31" · "Hughes 31" · "Seafarer 31 Mkii"]
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Performance Ratios
PHRF Rating PHRF (Performance Handicap Racing Fleet) is a national racing handicap measured in seconds per nautical mile. Lower values indicate faster boats. Ratings are sourced from US Sailing's national database (median across 60+ regional fleets).
Under 0 — Ultralight racer0–90 — Performance racer90–150 — Cruiser/racer150–210 — Typical cruiserOver 210 — Heavy/slow cruiser
 201
SA/Displacement Sail Area to Displacement ratio measures how much sail power a boat has relative to its weight. Higher values mean more performance and speed.
Under 14 — Heavy cruiser, slow14–18 — Cruising sailboat18–22 — Cruiser/racerOver 22 — Performance racer
 14.82
Comfort Ratio Ted Brewer's Comfort Ratio predicts how comfortable a boat will feel in offshore conditions. Higher values mean a steadier, more comfortable motion in a seaway.
Under 20 — Uncomfortably rough20–30 — Acceptable coastal30–40 — Good offshore comfortOver 40 — Very comfortable offshore
 25.68
Capsize Screening Formula The USHS Capsize Screening Formula estimates offshore capsize risk. Lower is safer — values under 2.0 are considered acceptable for offshore sailing.
Under 2.0 — Safe for offshore2.0–2.2 — Borderline offshoreOver 2.2 — Coastal use recommended
 1.89
Hull Speed Hull Speed is the theoretical maximum speed of a displacement hull, calculated from waterline length. Most cruising sailboats reach this speed in moderate conditions. 6.67
S# (Speed Number) The Speed Number (S#) is a quick performance index. Higher values indicate a faster, more powerful design relative to its size.
Under 3.0 — Slow cruiser3.0–5.0 — Average cruiser5.0–7.0 — Performance cruiserOver 7.0 — Racer
 1.72
Pounds/Inch Immersion Pounds per Inch Immersion (PPI) tells you how much weight is needed to sink the boat one inch. Useful for calculating how additional gear and stores affect waterline. 884.34
Rig Dimensions
I (Foretriangle Height) 37.8
J (Foretriangle Base) 11.9
P (Mainsail Luff) 32.8
E (Mainsail Foot) 11.5
SA Fore 224.91
SA Main 188.6
How It Compares

vs. Hughes 31, Rival 31

This boat Similar boats
Dimensions
LOA
Rasmus 31 ★
31.0 ft
Hughes 31
31.0 ft
Rival 31
31.0 ft
LWL
Rasmus 31 ★
24.8 ft
Hughes 31
24.0 ft
Rival 31
24.5 ft
Beam
Rasmus 31 ★
10.0 ft
Hughes 31
9.7 ft
Rival 31
9.7 ft
Displacement
Rasmus 31 ★
9 lbs
Hughes 31
9 lbs
Rival 31
11 lbs
Ballast
Rasmus 31 ★
—
Hughes 31
3 lbs
Rival 31
4 lbs
Performance
PHRF Rating (lower = faster)
Rasmus 31 ★
201 s/nm
Hughes 31
191 s/nm
Rival 31
—
Ballast / Disp (higher = stiffer)
Rasmus 31 ★
—
Hughes 31
36.8 %
Rival 31
40.0 %
Comfort Ratio (higher = more comfortable offshore)
Rasmus 31 ★
25.7
Hughes 31
—
Rival 31
31.9
Capsize Screening (lower = safer)
Rasmus 31 ★
1.89
Hughes 31
—
Rival 31
1.73
Displacement / Length (lower = lighter)
Rasmus 31 ★
—
Hughes 31
293
Rival 31
339
Hull Speed
Rasmus 31 ★
6.7 kts
Hughes 31
—
Rival 31
6.6 kts
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