Companion 21 vs SB20
How do the Companion 21 and SB20 compare? Below, their dimensions, displacement, sail area and the standard design ratios side by side, followed by a data-driven summary.
Companion 21 | Companion 21 | SB20 | |
|---|---|---|
| Length overall | 20.5 ft6.25 m | 20.3 ft6.20 m |
| Waterline length | 16.5 ft5.03 m | —— |
| Beam | 7.1 ft2.16 m | 6.9 ft2.10 m |
| Draft | 2.8 ft0.84 m | 4.9 ft1.50 m |
| Displacement | 3,100 lb1,406 kg | 1,510 lb685 kg |
| Ballast | 1,000 lb454 kg | 721 lb327 kg |
| Sail area | 218 ft²20.3 m² | 294 ft²27.3 m² |
| SA / Displacement | 16.41 | 35.74 |
| Displacement / Length | 308 | — |
| Comfort ratio | 19.9 | — |
| Capsize screening | 1.94 | 2.40 |
| Hull speed (kn) | 5.4 | — |
Companion 21 vs SB20: the short version
- The Companion 21 and SB20 are close in length (20.5 ft6.25 m vs 20.3 ft6.20 m ).
- The Companion 21 is heavier, displacing about 105% more, which usually means a steadier but slower-to-accelerate hull.
- On sail area/displacement the SB20 carries the more powerful rig (35.7 vs 16.4), favouring lighter-air performance.
- By the capsize screening formula the Companion 21 rates better for offshore work (1.94 vs 2.40).
Ratios are guidelines computed from published specs; condition, layout and gear matter as much as the numbers.