Swan 55
Oy Nautor AB · designed by Sparkman & Stephens · 1970
fin keelBermuda rigFinland
The Swan 55 is a 55-foot bermuda rig sailboat designed by Sparkman & Stephens and built by Oy Nautor AB, first launched in 1970.
General
| Builder | Oy Nautor AB |
|---|---|
| Designer | Sparkman & Stephens |
| Years built | 1970 |
| Hull type | fin keel |
| Rig type | Bermuda rig |
| Construction | — |
| Origin | Finland |
Dimensions
| LOA | 54.63 ft16.65 m |
|---|---|
| LWL | 38.48 ft11.73 m |
| Beam | 14.21 ft4.33 m |
| Draft (max) | 8.53 ft2.60 m |
| Displacement | 45,636 lb20,700 kg |
| Ballast | 17,000 lb7,711 kg |
| Sail Area | 1,277 ft²118.6 m² |
Design ratios
Computed from the specs above using the standard formulas. Try the sailboat calculators with your own numbers.
SA / Displacement 16.00 Under-canvassed — heavy-air / motorsailing
Ballast / Displacement 37.3 % Higher = stiffer / more sail-carrying power
Displacement / Length 358 Heavy — bluewater displacement
Comfort Ratio 47.5 Heavy offshore
Capsize Screening 1.59 Suited to offshore passages (≤ 2.0)
Hull Speed 8.3 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
$78,500 typical range $63,000 – $94,000
⚠ 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.
