Antrim 20 vs San Juan 21
How do the Antrim 20 and San Juan 21 compare? Below, their dimensions, displacement, sail area and the standard design ratios side by side, followed by a data-driven summary.
Antrim 20 
San Juan 21 | Antrim 20 | San Juan 21 | |
|---|---|---|
| Length overall | 20.4 ft6.22 m | 20.5 ft6.25 m |
| Waterline length | 17.5 ft5.33 m | 17.5 ft5.33 m |
| Beam | 8.0 ft2.44 m | 7.0 ft2.13 m |
| Draft | 4.0 ft1.22 m | 4.0 ft1.22 m |
| Displacement | 1,850 lb839 kg | 1,250 lb567 kg |
| Ballast | 750 lb340 kg | 400 lb181 kg |
| Sail area | 226 ft²21.0 m² | 193 ft²17.9 m² |
| SA / Displacement | 23.99 | 26.61 |
| Displacement / Length | 154 | 104 |
| Comfort ratio | 9.7 | 7.9 |
| Capsize screening | 2.61 | 2.60 |
| Hull speed (kn) | 5.6 | 5.6 |
Antrim 20 vs San Juan 21: the short version
- The Antrim 20 and San Juan 21 are close in length (20.4 ft6.22 m vs 20.5 ft6.25 m ).
- The Antrim 20 is heavier, displacing about 48% more, which usually means a steadier but slower-to-accelerate hull.
- On sail area/displacement the San Juan 21 carries the more powerful rig (26.6 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 San Juan 21 rates better for offshore work (2.60 vs 2.61).
Ratios are guidelines computed from published specs; condition, layout and gear matter as much as the numbers.