Delta 31 vs F-31 Sport Cruiser
How do the Delta 31 and F-31 Sport Cruiser compare? Below, their dimensions, displacement, sail area and the standard design ratios side by side, followed by a data-driven summary.
Delta 31 
F-31 Sport Cruiser | Delta 31 | F-31 Sport Cruiser | |
|---|---|---|
| Length overall | 30.7 ft9.35 m | 30.8 ft9.40 m |
| Waterline length | 24.9 ft7.60 m | 30.0 ft9.14 m |
| Beam | 10.0 ft3.04 m | 22.4 ft6.83 m |
| Draft | 5.9 ft1.80 m | 5.5 ft1.68 m |
| Displacement | 8,598 lb3,900 kg | 3,630 lb1,647 kg |
| Ballast | 3,505 lb1,590 kg | —— |
| Sail area | 436 ft²40.5 m² | 599 ft²55.6 m² |
| SA / Displacement | 16.62 | 40.58 |
| Displacement / Length | 248 | 60 |
| Comfort ratio | 23.3 | 3.0 |
| Capsize screening | 1.95 | 5.84 |
| Hull speed (kn) | 6.7 | 7.3 |
Delta 31 vs F-31 Sport Cruiser: the short version
- The Delta 31 and F-31 Sport Cruiser are close in length (30.7 ft9.35 m vs 30.8 ft9.40 m ).
- The Delta 31 is heavier, displacing about 137% 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 16.6), favouring lighter-air performance.
- The Delta 31 scores higher on the Brewer comfort ratio, suggesting an easier motion in a seaway.
- By the capsize screening formula the Delta 31 rates better for offshore work (1.95 vs 5.84).
Ratios are guidelines computed from published specs; condition, layout and gear matter as much as the numbers.