The Monsun 31 is moderately powered for comfortable coastal cruising, with acceptable motion comfort for coastal passages, designed for cruising comfort rather than racing.
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 24.7′, the Monsun 31 tops out around 6.7 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √24.7′ LWL = 6.7 kts
Performance Ratios
Racing handicap, sail-carrying power, stability and comfort — and what each one actually tells you about a day on the water.
PHRF Rating
204s/nm
Typical cruiser — designed for comfort and ease, not podium finishes.
SA / Displacement
15.1
Moderate sail power — a capable coastal cruiser, not overpowered.
Ballast / Displacement
45.4%
Race-oriented ballast ratio — very stiff and powerful.
Displacement / Length
275
Moderate-heavy — carries provisions well, deliberate in light air.
Comfort Ratio
27.2
Acceptable coastal comfort — fine for weekends, notice the chop offshore.
Capsize Screening
1.80
Below the 2.0 offshore threshold — acceptable for ocean passages.
Pounds/Inch Immersion
830lbs
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
27.2
Acceptable coastal comfort — fine for weekends, notice the chop offshore.
Under 20 — Snappy, racing motion
20–30 — Acceptable coastal
30–40 — Good offshore comfort
Over 40 — Very comfortable offshore
Capsize Screening Formula
1.80
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 Monsun 31 sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Cruiser/Racer 90–150
Cruiser 150–210
Heavy Cruiser 210–300
Dehler 31
162s/nm
Finn Flyer 31
162s/nm
Dufour 31
168s/nm
Monsun 31
204s/nm
Typical cruiser — designed for comfort and ease, not podium finishes.
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° |
2.5 |
3.2 |
3.5 |
3.7 |
| Close Reach60° |
3.0 |
3.8 |
4.3 |
4.5 |
| Beam Reach90° |
3.7 |
4.7 |
5.3 |
5.5 |
| Broad Reach120–135° |
3.4 |
4.3 |
4.9 |
5.1 |
| Run150–180° |
2.7 |
3.5 |
3.9 |
4.0 |
These are simplified estimates based on hull speed (6.7 kts),
SA/D (15.1), 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 Monsun 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 Monsun 31.
|
Monsun 31 |
Dehler 31 |
Delta 31 Albin |
Dufour 31 |
Finn Flyer 31 |
Hallberg Rassy 312 |
| Dimensions |
| LOA |
30.8 |
30.8 |
30.7 |
30.8 |
30.8 |
30.9 |
| LWL |
24.7 |
24.3 |
24.9 |
23.0 |
24.8 |
25.3 |
| Beam |
9.4 |
10.2 |
10.0 |
10.5 |
10.5 |
10.1 |
| Displacement |
9 |
7 |
8 |
9 |
7 |
10 |
| Ballast |
4 |
2 |
3 |
3 |
2 |
4 |
| Sail Area |
414 |
443 |
436 |
395 |
413 |
484 |
| Performance |
| PHRF |
204 |
162 |
— |
168 |
162 |
— |
| SA/Disp |
15.1 |
19.3 |
16.7 |
14.0 |
17.7 |
15.9 |
| Bal/Disp |
45.4 |
40.6 |
40.8 |
38.5 |
33.4 |
44.9 |
| Comfort |
27.2 |
18.9 |
23.3 |
25.5 |
18.4 |
28.5 |
| Capsize |
1.80 |
2.12 |
1.95 |
1.98 |
2.17 |
1.83 |
| Hull Speed |
6.7 |
6.6 |
6.7 |
6.4 |
6.7 |
6.7 |