Cal 20 vs Core Sound 20 Mark 3
How do the Cal 20 and Core Sound 20 Mark 3 compare? Below, their dimensions, displacement, sail area and the standard design ratios side by side, followed by a data-driven summary.
Cal 20 
Core Sound 20 Mark 3 | Cal 20 | Core Sound 20 Mark 3 | |
|---|---|---|
| Length overall | 20.0 ft6.10 m | 20.0 ft6.10 m |
| Waterline length | 18.0 ft5.49 m | —— |
| Beam | 7.0 ft2.13 m | 6.5 ft1.99 m |
| Draft | 3.3 ft1.01 m | 3.9 ft1.20 m |
| Displacement | 1,950 lb885 kg | 1,500 lb680 kg |
| Ballast | 900 lb408 kg | 438 lb199 kg |
| Sail area | 195 ft²18.1 m² | 180 ft²16.7 m² |
| SA / Displacement | 19.99 | 21.98 |
| Displacement / Length | 149 | — |
| Comfort ratio | 12.1 | — |
| Capsize screening | 2.24 | 2.28 |
| Hull speed (kn) | 5.7 | — |
Cal 20 vs Core Sound 20 Mark 3: the short version
- The Cal 20 and Core Sound 20 Mark 3 are close in length (20.0 ft6.10 m vs 20.0 ft6.10 m ).
- The Cal 20 is heavier, displacing about 30% more, which usually means a steadier but slower-to-accelerate hull.
- On sail area/displacement the Core Sound 20 Mark 3 carries the more powerful rig (22.0 vs 20.0), favouring lighter-air performance.
- By the capsize screening formula the Cal 20 rates better for offshore work (2.24 vs 2.28).
Ratios are guidelines computed from published specs; condition, layout and gear matter as much as the numbers.