The Laurin 31 is moderately powered for comfortable coastal cruising, with a steady, comfortable ride offshore.
Hull Speed
The theoretical displacement-mode speed limit — determined by waterline length, not engine or sail power.
A displacement hull pushes a bow wave whose speed is limited by the waterline length.
With a waterline of 28.2′, the Laurin 31 tops out around 7.1 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √28.2′ LWL = 7.1 kts
Performance Ratios
Racing handicap, sail-carrying power, stability and comfort — and what each one actually tells you about a day on the water.
SA / Displacement
16.4
Moderate sail power — a capable coastal cruiser, not overpowered.
Ballast / Displacement
40.0%
Stiff enough to carry a big genoa comfortably into moderate breeze.
Displacement / Length
241
Moderate — a good balance of speed and load-carrying ability.
Comfort Ratio
32.2
Good offshore comfort — steady enough for multi-day passages.
Capsize Screening
1.65
Below the 2.0 offshore threshold — acceptable for ocean passages.
Pounds/Inch Immersion
953lbs
Weight needed to sink the hull one inch — loading sensitivity.
Motion & Offshore Suitability
Two ratios that matter most when you're planning passages — how the boat feels in a seaway, and whether the hull geometry is suitable for open ocean.
Comfort Ratio
32.2
Good offshore comfort — steady enough for multi-day passages.
Under 20 — Snappy, racing motion
20–30 — Acceptable coastal
30–40 — Good offshore comfort
Over 40 — Very comfortable offshore
Capsize Screening Formula
1.65
Below the 2.0 offshore threshold — acceptable for ocean passages.
Under 2.0 — Acceptable for offshore
Over 2.0 — Coastal / protected waters
PHRF Fleet Position
Where the Laurin 31 sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Cruiser/Racer 90–150
Cruiser 150–210
Heavy Cruiser 210–300
Pearson 32
159s/nm
Fuji 32
246s/nm
Estimated Speed by Wind
Rough boat speed estimates at different true wind speeds and points of sail — derived from hull speed, SA/D, and displacement, not measured polars.
| Point of Sail |
6 kts TWS |
10 kts TWS |
15 kts TWS |
20 kts TWS |
| Close-hauled40–50° |
2.8 |
3.5 |
3.9 |
4.1 |
| Close Reach60° |
3.4 |
4.3 |
4.8 |
5.0 |
| Beam Reach90° |
4.1 |
5.2 |
5.8 |
6.1 |
| Broad Reach120–135° |
3.8 |
4.8 |
5.4 |
5.6 |
| Run150–180° |
3.1 |
3.9 |
4.3 |
4.5 |
These are simplified estimates based on hull speed (7.1 kts),
SA/D (16.4), and empirical efficiency curves — not instrument-measured
polars. Real-world speed varies with sea state, bottom condition, sail trim, and current.
Speeds in gold approach hull speed;
bold gold means near or at hull speed.
Wind Range & Comfort Envelope
Estimated wind ranges for comfortable sailing on the Laurin 31 — based on sail area, ballast, and displacement characteristics.
Ghost
Sweet Spot
Reef
Heavy
0–7 kts
7–22 kts
22–32 kts
32+ kts
Ghosting
0–7 kts
Light air, motor-sailing likely. Need patience and a light genoa.
Sweet Spot
7–22 kts
Comfortable under full sail. Best speed-to-comfort ratio.
Time to Reef
22–32 kts
Time to shorten sail. Reef the main, swap to a working jib.
Heavy Weather
32+ kts
Storm conditions. Storm jib or bare poles. Seek shelter if coastal.
How It Compares
Side-by-side with the boats most often cross-shopped against the Laurin 31.
|
Laurin 31 |
Alpha |
Evasion 32 Beneteau |
Fuji 32 |
Najad 320 |
Pearson 32 |
| Dimensions |
| LOA |
31.7 |
31.7 |
31.8 |
31.5 |
31.8 |
31.8 |
| LWL |
28.2 |
24.0 |
24.0 |
24.8 |
26.9 |
25.0 |
| Beam |
9.5 |
9.8 |
9.8 |
9.8 |
10.4 |
10.5 |
| Displacement |
12 |
8 |
12 |
13 |
10 |
9 |
| Ballast |
4 |
3 |
3 |
4 |
4 |
3 |
| Sail Area |
538 |
397 |
524 |
471 |
477 |
475 |
| Performance |
| PHRF |
— |
— |
— |
246 |
— |
159 |
| SA/Disp |
16.4 |
15.8 |
15.5 |
13.6 |
15.7 |
17.1 |
| Bal/Disp |
40.0 |
37.8 |
31.3 |
35.3 |
44.9 |
40.4 |
| Comfort |
32.2 |
22.8 |
35.4 |
36.1 |
26.1 |
23.5 |
| Capsize |
1.65 |
1.96 |
1.69 |
1.67 |
1.88 |
1.99 |
| Hull Speed |
7.1 |
6.6 |
6.6 |
6.7 |
7.0 |
6.7 |