Grampian 28 vs Grampian 30
How do the Grampian 28 and Grampian 30 compare? Below, their dimensions, displacement, sail area and the standard design ratios side by side, followed by a data-driven summary.
Grampian 28 
Grampian 30 | Grampian 28 | Grampian 30 | |
|---|---|---|
| Length overall | 28.0 ft8.53 m | 29.8 ft9.07 m |
| Waterline length | 24.5 ft7.47 m | 25.5 ft7.77 m |
| Beam | 9.5 ft2.90 m | 9.5 ft2.90 m |
| Draft | 4.8 ft1.47 m | 4.7 ft1.42 m |
| Displacement | 6,900 lb3,130 kg | 8,600 lb3,901 kg |
| Ballast | 3,060 lb1,388 kg | 3,870 lb1,755 kg |
| Sail area | 384 ft²35.7 m² | 389 ft²36.1 m² |
| SA / Displacement | 16.95 | 14.83 |
| Displacement / Length | 209 | 232 |
| Comfort ratio | 20.8 | 24.7 |
| Capsize screening | 2.00 | 1.85 |
| Hull speed (kn) | 6.6 | 6.8 |
Grampian 28 vs Grampian 30: the short version
- The Grampian 30 is the larger boat at 29.8 ft9.07 m LOA versus 28.0 ft8.53 m for the Grampian 28.
- The Grampian 30 is heavier, displacing about 25% more, which usually means a steadier but slower-to-accelerate hull.
- On sail area/displacement the Grampian 28 carries the more powerful rig (17.0 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 2.00).
Ratios are guidelines computed from published specs; condition, layout and gear matter as much as the numbers.