Swan 371
Nautor Swan OY · designed by Ron Holland · 1979
MonohullMasthead sloopFinland
The Swan 371 is a 30-foot masthead sloop sailboat designed by Ron Holland and built by Nautor Swan OY, first launched in 1979.
General
| Builder | Nautor Swan OY |
|---|---|
| Designer | Ron Holland |
| Years built | 1979 |
| Hull type | Monohull |
| Rig type | Masthead sloop |
| Construction | — |
| Origin | Finland |
Dimensions
| LOA | 29.72 ft9.06 m |
|---|---|
| LWL | 29.72 ft9.06 m |
| Beam | 11.35 ft3.46 m |
| Draft (max) | 6.79 ft2.07 m |
| Displacement | 16,100 lb7,303 kg |
| Ballast | 5,701 lb2,586 kg |
| Sail Area | 597 ft²55.5 m² |
Design ratios
Computed from the specs above using the standard formulas. Try the sailboat calculators with your own numbers.
SA / Displacement 14.98 Under-canvassed — heavy-air / motorsailing
Ballast / Displacement 35.4 % Higher = stiffer / more sail-carrying power
Displacement / Length 274 Moderate
Comfort Ratio 32.9 Moderate bluewater
Capsize Screening 1.80 Suited to offshore passages (≤ 2.0)
Hull Speed 7.3 kn Theoretical max displacement speed
How these numbers are calculated
- SA / Displacement
SA ÷ (Disp ÷ 64)^(2/3)— Power-to-weight. < 16 under-canvassed, 16–20 cruiser, > 20 racer.- Ballast / Displacement
Ballast ÷ Disp × 100— Stability/stiffness. Higher carries sail better.- Displacement / Length
Disp(lt) ÷ (0.01 · LWL)³— < 100 ultralight, 100–200 light, 200–300 moderate, > 300 heavy.- Comfort Ratio (Brewer)
Disp ÷ (0.65 · (0.7·LWL + 0.3·LOA) · Beam^1.33)— Motion in a seaway. Higher = more comfortable offshore.- Capsize Screening
Beam ÷ (Disp ÷ 64)^(1/3)— ≤ 2.0 favored for offshore; > 2.0 better for coastal use.- Hull Speed
1.34 · √LWL— Theoretical max displacement speed in knots.
Estimated price
$24,500 typical range $19,500 – $29,500
⚠ Rough estimate only — not market data. Derived from a simple model based on length and hull age; actual asking prices vary widely with condition, equipment, engine hours and location.
