Swan 391 vs Swan 43
How do the Swan 391 and Swan 43 compare? Below, their dimensions, displacement, sail area and the standard design ratios side by side, followed by a data-driven summary.
Swan 391 
Swan 43 | Swan 391 | Swan 43 | |
|---|---|---|
| Length overall | 33.1 ft10.08 m | 31.0 ft9.45 m |
| Waterline length | 33.1 ft10.08 m | 31.0 ft9.45 m |
| Beam | 12.4 ft3.79 m | 11.7 ft3.55 m |
| Draft | 7.2 ft2.19 m | 7.2 ft2.20 m |
| Displacement | 18,900 lb8,573 kg | 22,531 lb10,220 kg |
| Ballast | 6,800 lb3,084 kg | 10,400 lb4,717 kg |
| Sail area | 767 ft²71.3 m² | 821 ft²76.3 m² |
| SA / Displacement | 17.30 | 16.47 |
| Displacement / Length | 233 | 338 |
| Comfort ratio | 30.8 | 42.7 |
| Capsize screening | 1.87 | 1.65 |
| Hull speed (kn) | 7.7 | 7.5 |
Swan 391 vs Swan 43: the short version
- The Swan 391 is the larger boat at 33.1 ft10.08 m LOA versus 31.0 ft9.45 m for the Swan 43.
- The Swan 43 is heavier, displacing about 19% more, which usually means a steadier but slower-to-accelerate hull.
- On sail area/displacement the Swan 391 carries the more powerful rig (17.3 vs 16.5), favouring lighter-air performance.
- The Swan 43 scores higher on the Brewer comfort ratio, suggesting an easier motion in a seaway.
- By the capsize screening formula the Swan 43 rates better for offshore work (1.65 vs 1.87).
Ratios are guidelines computed from published specs; condition, layout and gear matter as much as the numbers.