Com-Pac Sunday Cat vs Siren 17
How do the Com-Pac Sunday Cat and Siren 17 compare? Below, their dimensions, displacement, sail area and the standard design ratios side by side, followed by a data-driven summary.
Com-Pac Sunday Cat 
Siren 17 | Com-Pac Sunday Cat | Siren 17 | |
|---|---|---|
| Length overall | 17.3 ft5.28 m | 17.2 ft5.23 m |
| Waterline length | 15.0 ft4.57 m | 15.0 ft4.57 m |
| Beam | 7.4 ft2.26 m | 6.7 ft2.03 m |
| Draft | 4.5 ft1.37 m | 4.3 ft1.30 m |
| Displacement | 1,500 lb680 kg | 750 lb340 kg |
| Ballast | 300 lb136 kg | 130 lb59 kg |
| Sail area | 150 ft²13.9 m² | 139 ft²12.9 m² |
| SA / Displacement | 18.32 | 26.94 |
| Displacement / Length | 198 | 99 |
| Comfort ratio | 10.3 | 5.9 |
| Capsize screening | 2.59 | 2.94 |
| Hull speed (kn) | 5.2 | 5.2 |
Com-Pac Sunday Cat vs Siren 17: the short version
- The Com-Pac Sunday Cat and Siren 17 are close in length (17.3 ft5.28 m vs 17.2 ft5.23 m ).
- The Com-Pac Sunday Cat is heavier, displacing about 100% more, which usually means a steadier but slower-to-accelerate hull.
- On sail area/displacement the Siren 17 carries the more powerful rig (26.9 vs 18.3), favouring lighter-air performance.
- The Com-Pac Sunday Cat scores higher on the Brewer comfort ratio, suggesting an easier motion in a seaway.
- By the capsize screening formula the Com-Pac Sunday Cat rates better for offshore work (2.59 vs 2.94).
Ratios are guidelines computed from published specs; condition, layout and gear matter as much as the numbers.