Open Surf Spi RHN 58 vs Topper Topaz
How do the Open Surf Spi RHN 58 and Topper Topaz compare? Below, their dimensions, displacement, sail area and the standard design ratios side by side, followed by a data-driven summary.
Open Surf Spi RHN 58 
Topper Topaz | Open Surf Spi RHN 58 | Topper Topaz | |
|---|---|---|
| Length overall | 12.6 ft3.85 m | 12.7 ft3.86 m |
| Waterline length | —— | —— |
| Beam | 2.2 ft0.68 m | 4.8 ft1.45 m |
| Draft | —— | —— |
| Displacement | 44 lb20 kg | 132 lb60 kg |
| Ballast | —— | —— |
| Sail area | —— | 80 ft²7.4 m² |
| SA / Displacement | — | 49.37 |
| Displacement / Length | — | — |
| Comfort ratio | — | — |
| Capsize screening | 2.53 | 3.74 |
| Hull speed (kn) | — | — |
Open Surf Spi RHN 58 vs Topper Topaz: the short version
- The Open Surf Spi RHN 58 and Topper Topaz are close in length (12.6 ft3.85 m vs 12.7 ft3.86 m ).
- The Topper Topaz is heavier, displacing about 200% more, which usually means a steadier but slower-to-accelerate hull.
- By the capsize screening formula the Open Surf Spi RHN 58 rates better for offshore work (2.53 vs 3.74).
Ratios are guidelines computed from published specs; condition, layout and gear matter as much as the numbers.