F-31 Sport Cruiser vs Mamba 31
How do the F-31 Sport Cruiser and Mamba 31 compare? Below, their dimensions, displacement, sail area and the standard design ratios side by side, followed by a data-driven summary.
F-31 Sport Cruiser 
Mamba 31 | F-31 Sport Cruiser | Mamba 31 | |
|---|---|---|
| Length overall | 30.8 ft9.40 m | 30.7 ft9.35 m |
| Waterline length | 30.0 ft9.14 m | 26.3 ft8.00 m |
| Beam | 22.4 ft6.83 m | 10.1 ft3.07 m |
| Draft | 5.5 ft1.68 m | 5.4 ft1.65 m |
| Displacement | 3,630 lb1,647 kg | 7,716 lb3,500 kg |
| Ballast | —— | 3,527 lb1,600 kg |
| Sail area | 599 ft²55.6 m² | 506 ft²47.0 m² |
| SA / Displacement | 40.58 | 20.73 |
| Displacement / Length | 60 | 190 |
| Comfort ratio | 3.0 | 19.9 |
| Capsize screening | 5.84 | 2.04 |
| Hull speed (kn) | 7.3 | 6.9 |
| Average used price | — | €12,000 |
F-31 Sport Cruiser vs Mamba 31: the short version
- The F-31 Sport Cruiser and Mamba 31 are close in length (30.8 ft9.40 m vs 30.7 ft9.35 m ).
- The Mamba 31 is heavier, displacing about 113% more, which usually means a steadier but slower-to-accelerate hull.
- On sail area/displacement the F-31 Sport Cruiser carries the more powerful rig (40.6 vs 20.7), favouring lighter-air performance.
- The Mamba 31 scores higher on the Brewer comfort ratio, suggesting an easier motion in a seaway.
- By the capsize screening formula the Mamba 31 rates better for offshore work (2.04 vs 5.84).
Ratios are guidelines computed from published specs; condition, layout and gear matter as much as the numbers.