Antrim 20 vs Cal 21
How do the Antrim 20 and Cal 21 compare? Below, their dimensions, displacement, sail area and the standard design ratios side by side, followed by a data-driven summary.
Antrim 20 | Antrim 20 | Cal 21 | |
|---|---|---|
| Length overall | 20.4 ft6.22 m | 20.5 ft6.25 m |
| Waterline length | 17.5 ft5.33 m | 16.7 ft5.08 m |
| Beam | 8.0 ft2.44 m | 6.7 ft2.03 m |
| Draft | 4.0 ft1.22 m | 4.3 ft1.30 m |
| Displacement | 1,850 lb839 kg | 1,100 lb499 kg |
| Ballast | 750 lb340 kg | 360 lb163 kg |
| Sail area | 226 ft²21.0 m² | 196 ft²18.2 m² |
| SA / Displacement | 23.99 | 29.43 |
| Displacement / Length | 154 | 106 |
| Comfort ratio | 9.7 | 7.6 |
| Capsize screening | 2.61 | 2.58 |
| Hull speed (kn) | 5.6 | 5.5 |
Antrim 20 vs Cal 21: the short version
- The Antrim 20 and Cal 21 are close in length (20.4 ft6.22 m vs 20.5 ft6.25 m ).
- The Antrim 20 is heavier, displacing about 68% more, which usually means a steadier but slower-to-accelerate hull.
- On sail area/displacement the Cal 21 carries the more powerful rig (29.4 vs 24.0), favouring lighter-air performance.
- The Antrim 20 scores higher on the Brewer comfort ratio, suggesting an easier motion in a seaway.
- By the capsize screening formula the Cal 21 rates better for offshore work (2.58 vs 2.61).
Ratios are guidelines computed from published specs; condition, layout and gear matter as much as the numbers.