Archambault A31 vs Archambault Grand Surprise
How do the Archambault A31 and Archambault Grand Surprise compare? Below, their dimensions, displacement, sail area and the standard design ratios side by side, followed by a data-driven summary.
Archambault A31 
Archambault Grand Surprise | Archambault A31 | Archambault Grand Surprise | |
|---|---|---|
| Length overall | 31.3 ft9.54 m | 31.3 ft9.54 m |
| Waterline length | —— | 29.3 ft8.93 m |
| Beam | 10.6 ft3.22 m | 9.8 ft2.98 m |
| Draft | 6.2 ft1.88 m | 6.7 ft2.05 m |
| Displacement | 6,945 lb3,150 kg | 58 lb26 kg |
| Ballast | 2,976 lb1,350 kg | 2,315 lb1,050 kg |
| Sail area | 555 ft²51.6 m² | 602 ft²55.9 m² |
| SA / Displacement | 24.39 | 642.83 |
| Displacement / Length | — | 1 |
| Comfort ratio | — | 0.1 |
| Capsize screening | 2.22 | 10.11 |
| Hull speed (kn) | — | 7.3 |
Archambault A31 vs Archambault Grand Surprise: the short version
- The Archambault A31 and Archambault Grand Surprise are close in length (31.3 ft9.54 m vs 31.3 ft9.54 m ).
- The Archambault A31 is heavier, displacing about 11874% more, which usually means a steadier but slower-to-accelerate hull.
- On sail area/displacement the Archambault Grand Surprise carries the more powerful rig (642.8 vs 24.4), favouring lighter-air performance.
- By the capsize screening formula the Archambault A31 rates better for offshore work (2.22 vs 10.11).
Ratios are guidelines computed from published specs; condition, layout and gear matter as much as the numbers.