The Tartan 37 is moderately powered for comfortable coastal cruising, with a steady, comfortable ride offshore, 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 25.5′, the Tartan 37 tops out around 6.8 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √25.5′ LWL = 6.8 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
174s/nm
Typical cruiser — designed for comfort and ease, not podium finishes.
SA / Displacement
17.6
Moderate sail power — a capable coastal cruiser, not overpowered.
Comfort Ratio
34.0
Good offshore comfort — steady enough for multi-day passages.
Capsize Screening
1.72
Below the 2.0 offshore threshold — acceptable for ocean passages.
Pounds/Inch Immersion
957lbs
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
34.0
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
1.72
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 Tartan 37 sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Racer 0–90
Cruiser/Racer 90–150
Cruiser 150–210
C&C 37
60s/nm
Soverel 37
168s/nm
Little Harbor 37
171s/nm
Tartan 37
174s/nm
Typical cruiser — designed for comfort and ease, not podium finishes.
Black Watch 37
177s/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° |
2.7 |
3.5 |
3.9 |
4.0 |
| Close Reach60° |
3.3 |
4.2 |
4.7 |
4.9 |
| Beam Reach90° |
4.1 |
5.1 |
5.7 |
6.0 |
| Broad Reach120–135° |
3.8 |
4.7 |
5.3 |
5.5 |
| Run150–180° |
3.0 |
3.8 |
4.2 |
4.4 |
These are simplified estimates based on hull speed (6.8 kts),
SA/D (17.6), 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 Tartan 37 — based on sail area, ballast, and displacement characteristics.
Ghost
Sweet Spot
Reef
Heavy
0–7 kts
7–20 kts
20–28 kts
28+ kts
Ghosting
0–7 kts
Light air, motor-sailing likely. Need patience and a light genoa.
Sweet Spot
7–20 kts
Comfortable under full sail. Best speed-to-comfort ratio.
Time to Reef
20–28 kts
Time to shorten sail. Reef the main, swap to a working jib.
Heavy Weather
28+ 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 Tartan 37.
|
Tartan 37 |
Black Watch 37 |
C&C 37 |
Irwin 37 1 |
Little Harbor 37 |
Soverel 37 |
| Dimensions |
| LOA |
37.0 |
37.0 |
— |
37.0 |
37.0 |
37.0 |
| LWL |
25.5 |
25.0 |
— |
30.0 |
25.6 |
31.0 |
| Beam |
10.5 |
10.5 |
— |
11.5 |
10.5 |
9.3 |
| Displacement |
14 |
15 |
— |
18 |
19 |
12 |
| Ballast |
4 |
4 |
— |
6 |
4 |
4 |
| Sail Area |
654 |
597 |
— |
558 |
618 |
— |
| Performance |
| PHRF |
174 |
177 |
60 |
— |
171 |
168 |
| SA/Disp |
17.6 |
15.4 |
— |
13.1 |
13.9 |
— |
| Bal/Disp |
— |
27.1 |
— |
37.2 |
— |
33.3 |
| Comfort |
34.0 |
36.6 |
— |
33.5 |
44.3 |
— |
| Capsize |
1.72 |
1.69 |
— |
1.76 |
1.58 |
— |
| Hull Speed |
6.8 |
6.7 |
— |
7.3 |
6.8 |
— |