Blue Jay Sailboat vs San Juan 21
How do the Blue Jay Sailboat 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.
Blue Jay Sailboat 
San Juan 21 | Blue Jay Sailboat | San Juan 21 | |
|---|---|---|
| Length overall | 13.5 ft4.11 m | 20.5 ft6.25 m |
| Waterline length | 11.3 ft3.43 m | 17.5 ft5.33 m |
| Beam | 5.2 ft1.58 m | 7.0 ft2.13 m |
| Draft | 3.7 ft1.12 m | 4.0 ft1.22 m |
| Displacement | 275 lb125 kg | 1,250 lb567 kg |
| Ballast | —— | 400 lb181 kg |
| Sail area | 90 ft²8.4 m² | 193 ft²17.9 m² |
| SA / Displacement | 34.05 | 26.61 |
| Displacement / Length | 86 | 104 |
| Comfort ratio | 4.0 | 7.9 |
| Capsize screening | 3.18 | 2.60 |
| Hull speed (kn) | 4.5 | 5.6 |
Blue Jay Sailboat vs San Juan 21: the short version
- The San Juan 21 is the larger boat at 20.5 ft6.25 m LOA versus 13.5 ft4.11 m for the Blue Jay Sailboat.
- The San Juan 21 is heavier, displacing about 355% more, which usually means a steadier but slower-to-accelerate hull.
- On sail area/displacement the Blue Jay Sailboat carries the more powerful rig (34.1 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 3.18).
Ratios are guidelines computed from published specs; condition, layout and gear matter as much as the numbers.