Grampian 30
Grampian Marine · designed by Alex McGruer · 1969
fin keelBermuda rigCanada
The Grampian 30 is a 30-foot bermuda rig sailboat designed by Alex McGruer and built by Grampian Marine, first launched in 1969.
General
| Builder | Grampian Marine |
|---|---|
| Designer | Alex McGruer |
| Years built | 1969 |
| Hull type | fin keel |
| Rig type | Bermuda rig |
| Construction | fiberglass |
| Origin | Canada |
Dimensions
| LOA | 29.75 ft9.07 m |
|---|---|
| LWL | 25.50 ft7.77 m |
| Beam | 9.50 ft2.90 m |
| Draft (max) | 4.67 ft1.42 m |
| Displacement | 8,600 lb3,901 kg |
| Ballast | 3,870 lb1,755 kg |
| Sail Area | 389 ft²36.1 m² |
Design ratios
Computed from the specs above using the standard formulas. Try the sailboat calculators with your own numbers.
SA / Displacement 14.83 Under-canvassed — heavy-air / motorsailing
Ballast / Displacement 45.0 % Higher = stiffer / more sail-carrying power
Displacement / Length 232 Moderate
Comfort Ratio 24.7 Coastal cruiser
Capsize Screening 1.85 Suited to offshore passages (≤ 2.0)
Hull Speed 6.8 kn Theoretical max displacement speed
How these numbers are calculated
- SA / Displacement
SA ÷ (Disp ÷ 64)^(2/3)— Power-to-weight. < 16 under-canvassed, 16–20 cruiser, > 20 racer.- Ballast / Displacement
Ballast ÷ Disp × 100— Stability/stiffness. Higher carries sail better.- Displacement / Length
Disp(lt) ÷ (0.01 · LWL)³— < 100 ultralight, 100–200 light, 200–300 moderate, > 300 heavy.- Comfort Ratio (Brewer)
Disp ÷ (0.65 · (0.7·LWL + 0.3·LOA) · Beam^1.33)— Motion in a seaway. Higher = more comfortable offshore.- Capsize Screening
Beam ÷ (Disp ÷ 64)^(1/3)— ≤ 2.0 favored for offshore; > 2.0 better for coastal use.- Hull Speed
1.34 · √LWL— Theoretical max displacement speed in knots.
Estimated price
$23,000 typical range $18,500 – $27,500
⚠ Rough estimate only — not market data. Derived from a simple model based on length and hull age; actual asking prices vary widely with condition, equipment, engine hours and location.
