Allmand 31 vs Delta 31
How do the Allmand 31 and Delta 31 compare? Below, their dimensions, displacement, sail area and the standard design ratios side by side, followed by a data-driven summary.
Allmand 31 | Allmand 31 | Delta 31 | |
|---|---|---|
| Length overall | 30.8 ft9.37 m | 30.7 ft9.35 m |
| Waterline length | 27.9 ft8.51 m | 24.9 ft7.60 m |
| Beam | 11.3 ft3.45 m | 10.0 ft3.04 m |
| Draft | 3.8 ft1.17 m | 5.9 ft1.80 m |
| Displacement | 11,100 lb5,035 kg | 8,598 lb3,900 kg |
| Ballast | 4,300 lb1,950 kg | 3,505 lb1,590 kg |
| Sail area | 461 ft²42.8 m² | 436 ft²40.5 m² |
| SA / Displacement | 14.82 | 16.62 |
| Displacement / Length | 228 | 248 |
| Comfort ratio | 23.5 | 23.3 |
| Capsize screening | 2.03 | 1.95 |
| Hull speed (kn) | 7.1 | 6.7 |
Allmand 31 vs Delta 31: the short version
- The Allmand 31 and Delta 31 are close in length (30.8 ft9.37 m vs 30.7 ft9.35 m ).
- The Allmand 31 is heavier, displacing about 29% more, which usually means a steadier but slower-to-accelerate hull.
- On sail area/displacement the Delta 31 carries the more powerful rig (16.6 vs 14.8), favouring lighter-air performance.
- The Allmand 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 2.03).
Ratios are guidelines computed from published specs; condition, layout and gear matter as much as the numbers.