San Juan 21 vs San Juan 24
How do the San Juan 21 and San Juan 24 compare? Below, their dimensions, displacement, sail area and the standard design ratios side by side, followed by a data-driven summary.
San Juan 21 
San Juan 24 | San Juan 21 | San Juan 24 | |
|---|---|---|
| Length overall | 20.5 ft6.25 m | 24.0 ft7.32 m |
| Waterline length | 17.5 ft5.33 m | 19.5 ft5.94 m |
| Beam | 7.0 ft2.13 m | 8.0 ft2.44 m |
| Draft | 4.0 ft1.22 m | 4.0 ft1.22 m |
| Displacement | 1,250 lb567 kg | 3,200 lb1,451 kg |
| Ballast | 400 lb181 kg | 1,650 lb748 kg |
| Sail area | 193 ft²17.9 m² | 247 ft²22.9 m² |
| SA / Displacement | 26.61 | 18.20 |
| Displacement / Length | 104 | 193 |
| Comfort ratio | 7.9 | 14.9 |
| Capsize screening | 2.60 | 2.17 |
| Hull speed (kn) | 5.6 | 5.9 |
San Juan 21 vs San Juan 24: the short version
- The San Juan 24 is the larger boat at 24.0 ft7.32 m LOA versus 20.5 ft6.25 m for the San Juan 21.
- The San Juan 24 is heavier, displacing about 156% 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 18.2), favouring lighter-air performance.
- The San Juan 24 scores higher on the Brewer comfort ratio, suggesting an easier motion in a seaway.
- By the capsize screening formula the San Juan 24 rates better for offshore work (2.17 vs 2.60).
Ratios are guidelines computed from published specs; condition, layout and gear matter as much as the numbers.