Dark Harbor 17 1/2
designed by B.B. Crowninshield · 1908
FullGaff rigged sloop
The Dark Harbor 17 1/2 is a 26-foot gaff rigged sloop sailboat designed by B.B. Crowninshield, first launched in 1908.
General
| Builder | — |
|---|---|
| Designer | B.B. Crowninshield |
| Years built | 1908 |
| Hull type | Full |
| Rig type | Gaff rigged sloop |
| Construction | wood |
| Origin | — |
Dimensions
| LOA | 25.82 ft7.87 m |
|---|---|
| LWL | 17.49 ft5.33 m |
| Beam | 6.29 ft1.92 m |
| Draft (max) | 4.27 ft1.30 m |
| Displacement | 3,420 lb1,551 kg |
| Ballast | —— |
| Sail Area | 311 ft²28.9 m² |
Design ratios
Computed from the specs above using the standard formulas. Try the sailboat calculators with your own numbers.
SA / Displacement 21.92 Performance / racer — powered up
Displacement / Length 285 Moderate
Comfort Ratio 22.8 Coastal cruiser
Capsize Screening 1.67 Suited to offshore passages (≤ 2.0)
Hull Speed 5.6 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
$15,500 typical range $12,500 – $18,500
⚠ 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.
