Swan 39 vs Swan 651
How do the Swan 39 and Swan 651 compare? Below, their dimensions, displacement, sail area and the standard design ratios side by side, followed by a data-driven summary.
Swan 39 | Swan 39 | Swan 651 | |
|---|---|---|
| Length overall | 31.5 ft9.60 m | 55.1 ft16.80 m |
| Waterline length | 31.5 ft9.60 m | 55.1 ft16.80 m |
| Beam | 12.5 ft3.81 m | 17.4 ft5.30 m |
| Draft | 7.2 ft2.19 m | 11.5 ft3.50 m |
| Displacement | 18,001 lb8,165 kg | 79,366 lb36,000 kg |
| Ballast | 7,900 lb3,583 kg | 31,700 lb14,379 kg |
| Sail area | 761 ft²70.7 m² | —— |
| SA / Displacement | 17.73 | — |
| Displacement / Length | 257 | 212 |
| Comfort ratio | 30.6 | 49.6 |
| Capsize screening | 1.91 | 1.62 |
| Hull speed (kn) | 7.5 | 9.9 |
Swan 39 vs Swan 651: the short version
- The Swan 651 is the larger boat at 55.1 ft16.80 m LOA versus 31.5 ft9.60 m for the Swan 39.
- The Swan 651 is heavier, displacing about 341% more, which usually means a steadier but slower-to-accelerate hull.
- The Swan 651 scores higher on the Brewer comfort ratio, suggesting an easier motion in a seaway.
- By the capsize screening formula the Swan 651 rates better for offshore work (1.62 vs 1.91).
Ratios are guidelines computed from published specs; condition, layout and gear matter as much as the numbers.