Sirocco 15 vs Windmill
How do the Sirocco 15 and Windmill compare? Below, their dimensions, displacement, sail area and the standard design ratios side by side, followed by a data-driven summary.
Sirocco 15 
Windmill | Sirocco 15 | Windmill | |
|---|---|---|
| Length overall | 15.3 ft4.67 m | 15.5 ft4.72 m |
| Waterline length | 14.3 ft4.34 m | 14.5 ft4.42 m |
| Beam | 5.9 ft1.80 m | 4.8 ft1.45 m |
| Draft | 3.8 ft1.17 m | 4.2 ft1.27 m |
| Displacement | 470 lb213 kg | 198 lb90 kg |
| Ballast | 75 lb34 kg | —— |
| Sail area | 147 ft²13.7 m² | 119 ft²11.1 m² |
| SA / Displacement | 38.91 | 56.05 |
| Displacement / Length | 73 | 29 |
| Comfort ratio | 4.7 | 2.6 |
| Capsize screening | 3.05 | 3.26 |
| Hull speed (kn) | 5.1 | 5.1 |
Sirocco 15 vs Windmill: the short version
- The Sirocco 15 and Windmill are close in length (15.3 ft4.67 m vs 15.5 ft4.72 m ).
- The Sirocco 15 is heavier, displacing about 137% more, which usually means a steadier but slower-to-accelerate hull.
- On sail area/displacement the Windmill carries the more powerful rig (56.0 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 3.26).
Ratios are guidelines computed from published specs; condition, layout and gear matter as much as the numbers.