470 vs Sirocco 15
How do the 470 and Sirocco 15 compare? Below, their dimensions, displacement, sail area and the standard design ratios side by side, followed by a data-driven summary.
470 
Sirocco 15 | 470 | Sirocco 15 | |
|---|---|---|
| Length overall | 15.4 ft4.70 m | 15.3 ft4.67 m |
| Waterline length | 14.4 ft4.40 m | 14.3 ft4.34 m |
| Beam | 4.2 ft1.27 m | 5.9 ft1.80 m |
| Draft | 0.5 ft0.15 m | 3.8 ft1.17 m |
| Displacement | 265 lb120 kg | 470 lb213 kg |
| Ballast | —— | 75 lb34 kg |
| Sail area | 137 ft²12.7 m² | 147 ft²13.7 m² |
| SA / Displacement | 53.13 | 38.91 |
| Displacement / Length | 39 | 73 |
| Comfort ratio | 4.1 | 4.7 |
| Capsize screening | 2.60 | 3.05 |
| Hull speed (kn) | 5.1 | 5.1 |
470 vs Sirocco 15: the short version
- The 470 and Sirocco 15 are close in length (15.4 ft4.70 m vs 15.3 ft4.67 m ).
- The Sirocco 15 is heavier, displacing about 77% more, which usually means a steadier but slower-to-accelerate hull.
- On sail area/displacement the 470 carries the more powerful rig (53.1 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 470 rates better for offshore work (2.60 vs 3.05).
Ratios are guidelines computed from published specs; condition, layout and gear matter as much as the numbers.