US1 vs Windmill
How do the US1 and Windmill compare? Below, their dimensions, displacement, sail area and the standard design ratios side by side, followed by a data-driven summary.
US1 
Windmill | US1 | Windmill | |
|---|---|---|
| Length overall | 15.4 ft4.70 m | 15.5 ft4.72 m |
| Waterline length | 13.5 ft4.11 m | 14.5 ft4.42 m |
| Beam | 4.6 ft1.40 m | 4.8 ft1.45 m |
| Draft | 2.5 ft0.76 m | 4.2 ft1.27 m |
| Displacement | 190 lb86 kg | 198 lb90 kg |
| Ballast | —— | —— |
| Sail area | 90 ft²8.4 m² | 119 ft²11.1 m² |
| SA / Displacement | 43.57 | 56.05 |
| Displacement / Length | 34 | 29 |
| Comfort ratio | 2.7 | 2.6 |
| Capsize screening | 3.19 | 3.26 |
| Hull speed (kn) | 4.9 | 5.1 |
US1 vs Windmill: the short version
- The US1 and Windmill are close in length (15.4 ft4.70 m vs 15.5 ft4.72 m ).
- On sail area/displacement the Windmill carries the more powerful rig (56.0 vs 43.6), favouring lighter-air performance.
- The US1 scores higher on the Brewer comfort ratio, suggesting an easier motion in a seaway.
- By the capsize screening formula the US1 rates better for offshore work (3.19 vs 3.26).
Ratios are guidelines computed from published specs; condition, layout and gear matter as much as the numbers.