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Mp 31
Designer: Matti Pulli  ·  Builder: Länsivene Oy (Fin)  ·  First built: 1982
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About the Mp 31

Finnish designer Matti Pulli created this elegant 31-footer during the early 1980s as a sophisticated coastal cruiser with surprising offshore capabilities. Built by Länsivene Oy in mahogany construction, only eight examples were produced between 1982 and 1984, making the Mp 31 a rare find in today's market. The design showcases classic Scandinavian sensibilities with its moderate displacement of 6,614 pounds and well-balanced proportions. The fractional sloop rig with 473.61 square feet of sail area provides excellent performance in light to moderate conditions, while the fin keel and spade rudder configuration delivers responsive handling and good upwind ability. With a waterline length of 24.61 feet, the boat achieves a respectable hull speed of 6.65 knots. The Mp 31's comfort ratio of 16.81 indicates this is primarily a performance-oriented cruiser rather than a heavy offshore passage-maker, though the reasonable capsize screening value of 2.24 suggests adequate stability for coastal and near-offshore sailing. The mahogany construction reflects the high-quality craftsmanship typical of Finnish boatbuilding, though potential buyers should carefully evaluate the condition of the wood and any necessary maintenance requirements given the boat's age.

Core Dimensions
LOA (Length Overall) 31.00 ft / 9.45 m
LWL (Waterline Length) 24.61 ft / 7.50 m
Beam 10.50 ft / 3.20 m
Max Draft 5.58 ft / 1.70 m
Displacement 6,614.00 lb / 3,000 kg
Sail Area (Reported) 473.61 ft² / 44.00 m²
Design & Construction
Hull Type Fin w/spade rudder
Rigging Type Fractional Sloop
Construction Wood (mahogany)
Designer Matti Pulli
Builder Länsivene Oy (FIN)
First Built 1982
Last Built 1984
Number Built 8
Associations MP Owners
Related Sailboats Mistral 31 · Alerion Sport 30 · Siesta 32 · Trapper 950 · Bavaria 31
Owner Reviews

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Performance Ratios
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
 21.57
Displacement/Length Displacement to Length ratio measures how heavy a boat is relative to its waterline length. Lower values mean a lighter, faster boat.
Under 100 — Ultralight racer100–200 — Light cruiser/racer200–300 — Moderate cruiser300–400 — Heavy cruiserOver 400 — Very heavy
 198.1
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
 16.81
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
 2.24
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. 6.65 kn
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
 3.11
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. 923.31 pounds/inch
SA/Displacement (Calc) Calculated Sail Area to Displacement ratio using actual measured sail dimensions rather than reported values. More precise than the reported SA/Disp figure. 20.39
Rig Dimensions
I (Foretriangle Height) 34.45 ft / 10.50 m
J (Foretriangle Base) 10.50 ft / 3.20 m
P (Mainsail Luff) 38.71 ft / 11.80 m
E (Mainsail Foot) 13.78 ft / 4.20 m
SA Fore 180.86 ft² / 16.80 m²
SA Main 266.71 ft² / 24.78 m²
SA Total (100%) 447.57 ft² / 41.58 m²
Est. Forestay Length 36.01 ft / 10.98 m
Mast Height (DWL) 45.93 ft / 14.00 m
How It Compares

vs. Alerion Sport 30, Bavaria 31, Mistral 31, Siesta 32, Trapper 950

This boat Similar boats
Dimensions
LOA
Mp 31 ★
31.0 ft
Alerion Sport 30
30.1 ft
Bavaria 31
31.2 ft
Mistral 31
31.1 ft
Siesta 32
31.7 ft
Trapper 950
31.1 ft
LWL
Mp 31 ★
24.6 ft
Alerion Sport 30
24.4 ft
Bavaria 31
27.6 ft
Mistral 31
23.7 ft
Siesta 32
25.5 ft
Trapper 950
23.7 ft
Beam
Mp 31 ★
10.5 ft
Alerion Sport 30
8.8 ft
Bavaria 31
11.2 ft
Mistral 31
10.2 ft
Siesta 32
9.2 ft
Trapper 950
10.2 ft
Displacement
Mp 31 ★
6 lbs
Alerion Sport 30
6 lbs
Bavaria 31
9 lbs
Mistral 31
6 lbs
Siesta 32
7 lbs
Trapper 950
6 lbs
Ballast
Mp 31 ★
—
Alerion Sport 30
2 lbs
Bavaria 31
3 lbs
Mistral 31
—
Siesta 32
3 lbs
Trapper 950
—
Sail Area
Mp 31 ★
473 sq ft
Alerion Sport 30
465 sq ft
Bavaria 31
484 sq ft
Mistral 31
430 sq ft
Siesta 32
447 sq ft
Trapper 950
—
Performance
PHRF Rating (lower = faster)
Mp 31 ★
—
Alerion Sport 30
—
Bavaria 31
177 s/nm
Mistral 31
—
Siesta 32
138 s/nm
Trapper 950
—
SA / Displacement (higher = more powerful)
Mp 31 ★
21.6
Alerion Sport 30
21.6
Bavaria 31
17.5
Mistral 31
20.9
Siesta 32
19.0
Trapper 950
—
Ballast / Disp (higher = stiffer)
Mp 31 ★
—
Alerion Sport 30
41.3 %
Bavaria 31
35.7 %
Mistral 31
—
Siesta 32
53.5 %
Trapper 950
—
Comfort Ratio (higher = more comfortable offshore)
Mp 31 ★
16.8
Alerion Sport 30
21.1
Bavaria 31
—
Mistral 31
16.2
Siesta 32
21.7
Trapper 950
—
Capsize Screening (lower = safer)
Mp 31 ★
2.24
Alerion Sport 30
1.89
Bavaria 31
—
Mistral 31
2.25
Siesta 32
1.89
Trapper 950
—
Displacement / Length (lower = lighter)
Mp 31 ★
198
Alerion Sport 30
196
Bavaria 31
197
Mistral 31
201
Siesta 32
197
Trapper 950
201
Hull Speed
Mp 31 ★
6.7 kts
Alerion Sport 30
6.6 kts
Bavaria 31
—
Mistral 31
6.5 kts
Siesta 32
6.8 kts
Trapper 950
—
Speed Number (higher = faster)
Mp 31 ★
3.1
Alerion Sport 30
2.9
Bavaria 31
—
Mistral 31
—
Siesta 32
3.0
Trapper 950
—
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