Kirby 25
Mirage Yachts · designed by Bruce Kirby · 1978
fin keelFractional rigged sloopCanada
The Kirby 25 is a 25-foot fractional rigged sloop sailboat designed by Bruce Kirby and built by Mirage Yachts, first launched in 1978.
General
| Builder | Mirage Yachts |
|---|---|
| Designer | Bruce Kirby |
| Years built | 1978 |
| Hull type | fin keel |
| Rig type | Fractional rigged sloop |
| Construction | fiberglass |
| Origin | Canada |
Dimensions
| LOA | 25.17 ft7.67 m |
|---|---|
| LWL | 20.75 ft6.32 m |
| Beam | 8.75 ft2.67 m |
| Draft (max) | 4.17 ft1.27 m |
| Displacement | 3,150 lb1,429 kg |
| Ballast | 1,150 lb522 kg |
| Sail Area | 289 ft²26.8 m² |
Design ratios
Computed from the specs above using the standard formulas. Try the sailboat calculators with your own numbers.
SA / Displacement 21.52 Performance / racer — powered up
Ballast / Displacement 36.5 % Higher = stiffer / more sail-carrying power
Displacement / Length 157 Light
Comfort Ratio 12.3 Racing / light coastal
Capsize Screening 2.39 Better suited to coastal use (> 2.0)
Hull Speed 6.1 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
$17,500 typical range $14,000 – $21,000
⚠ 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.
