Discovery 7.9 vs Grampian 30
How do the Discovery 7.9 and Grampian 30 compare? Below, their dimensions, displacement, sail area and the standard design ratios side by side, followed by a data-driven summary.
Discovery 7.9 
Grampian 30 | Discovery 7.9 | Grampian 30 | |
|---|---|---|
| Length overall | 26.0 ft7.92 m | 29.8 ft9.07 m |
| Waterline length | 21.8 ft6.63 m | 25.5 ft7.77 m |
| Beam | 8.3 ft2.54 m | 9.5 ft2.90 m |
| Draft | 3.8 ft1.14 m | 4.7 ft1.42 m |
| Displacement | 5,100 lb2,313 kg | 8,600 lb3,901 kg |
| Ballast | 2,300 lb1,043 kg | 3,870 lb1,755 kg |
| Sail area | 323 ft²30.0 m² | 389 ft²36.1 m² |
| SA / Displacement | 17.44 | 14.83 |
| Displacement / Length | 221 | 232 |
| Comfort ratio | 20.3 | 24.7 |
| Capsize screening | 1.94 | 1.85 |
| Hull speed (kn) | 6.2 | 6.8 |
Discovery 7.9 vs Grampian 30: the short version
- The Grampian 30 is the larger boat at 29.8 ft9.07 m LOA versus 26.0 ft7.92 m for the Discovery 7.9.
- The Grampian 30 is heavier, displacing about 69% more, which usually means a steadier but slower-to-accelerate hull.
- On sail area/displacement the Discovery 7.9 carries the more powerful rig (17.4 vs 14.8), favouring lighter-air performance.
- The Grampian 30 scores higher on the Brewer comfort ratio, suggesting an easier motion in a seaway.
- By the capsize screening formula the Grampian 30 rates better for offshore work (1.85 vs 1.94).
Ratios are guidelines computed from published specs; condition, layout and gear matter as much as the numbers.