Sirocco 15 vs US1
How do the Sirocco 15 and US1 compare? Below, their dimensions, displacement, sail area and the standard design ratios side by side, followed by a data-driven summary.
Sirocco 15 
US1 | Sirocco 15 | US1 | |
|---|---|---|
| Length overall | 15.3 ft4.67 m | 15.4 ft4.70 m |
| Waterline length | 14.3 ft4.34 m | 13.5 ft4.11 m |
| Beam | 5.9 ft1.80 m | 4.6 ft1.40 m |
| Draft | 3.8 ft1.17 m | 2.5 ft0.76 m |
| Displacement | 470 lb213 kg | 190 lb86 kg |
| Ballast | 75 lb34 kg | —— |
| Sail area | 147 ft²13.7 m² | 90 ft²8.4 m² |
| SA / Displacement | 38.91 | 43.57 |
| Displacement / Length | 73 | 34 |
| Comfort ratio | 4.7 | 2.7 |
| Capsize screening | 3.05 | 3.19 |
| Hull speed (kn) | 5.1 | 4.9 |
Sirocco 15 vs US1: the short version
- The Sirocco 15 and US1 are close in length (15.3 ft4.67 m vs 15.4 ft4.70 m ).
- The Sirocco 15 is heavier, displacing about 147% more, which usually means a steadier but slower-to-accelerate hull.
- On sail area/displacement the US1 carries the more powerful rig (43.6 vs 38.9), favouring lighter-air performance.
- The Sirocco 15 scores higher on the Brewer comfort ratio, suggesting an easier motion in a seaway.
- By the capsize screening formula the Sirocco 15 rates better for offshore work (3.05 vs 3.19).
Ratios are guidelines computed from published specs; condition, layout and gear matter as much as the numbers.