Discovery 7.9
Grampian Marine · designed by Alex McGruer · 1975
fin keelBermuda rigCanada
The Discovery 7.9 is a 26-foot bermuda rig sailboat designed by Alex McGruer and built by Grampian Marine, first launched in 1975.
General
| Builder | Grampian Marine |
|---|---|
| Designer | Alex McGruer |
| Years built | 1975 |
| Hull type | fin keel |
| Rig type | Bermuda rig |
| Construction | fiberglass |
| Origin | Canada |
Dimensions
| LOA | 26.00 ft7.92 m |
|---|---|
| LWL | 21.75 ft6.63 m |
| Beam | 8.33 ft2.54 m |
| Draft (max) | 3.75 ft1.14 m |
| Displacement | 5,100 lb2,313 kg |
| Ballast | 2,300 lb1,043 kg |
| Sail Area | 323 ft²30.0 m² |
Design ratios
Computed from the specs above using the standard formulas. Try the sailboat calculators with your own numbers.
SA / Displacement 17.44 Cruiser — good all-round performance
Ballast / Displacement 45.1 % Higher = stiffer / more sail-carrying power
Displacement / Length 221 Moderate
Comfort Ratio 20.3 Coastal cruiser
Capsize Screening 1.94 Suited to offshore passages (≤ 2.0)
Hull Speed 6.2 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
$18,500 typical range $15,000 – $22,000
⚠ 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.
