C-Lark vs San Juan 21
How do the C-Lark 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.
C-Lark 
San Juan 21 | C-Lark | San Juan 21 | |
|---|---|---|
| Length overall | 14.0 ft4.27 m | 20.5 ft6.25 m |
| Waterline length | 14.0 ft4.27 m | 17.5 ft5.33 m |
| Beam | 5.7 ft1.74 m | 7.0 ft2.13 m |
| Draft | 3.5 ft1.07 m | 4.0 ft1.22 m |
| Displacement | 295 lb134 kg | 1,250 lb567 kg |
| Ballast | —— | 400 lb181 kg |
| Sail area | 133 ft²12.4 m² | 193 ft²17.9 m² |
| SA / Displacement | 48.02 | 26.61 |
| Displacement / Length | 48 | 104 |
| Comfort ratio | 3.2 | 7.9 |
| Capsize screening | 3.43 | 2.60 |
| Hull speed (kn) | 5.0 | 5.6 |
C-Lark vs San Juan 21: the short version
- The San Juan 21 is the larger boat at 20.5 ft6.25 m LOA versus 14.0 ft4.27 m for the C-Lark.
- The San Juan 21 is heavier, displacing about 324% more, which usually means a steadier but slower-to-accelerate hull.
- On sail area/displacement the C-Lark carries the more powerful rig (48.0 vs 26.6), favouring lighter-air performance.
- The San Juan 21 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 3.43).
Ratios are guidelines computed from published specs; condition, layout and gear matter as much as the numbers.