C-Scow
Johnson Boatworks · designed by John O. Johnson · 1905
twin centerboardscat rigUnited States
The C-Scow is a 20-foot cat rig sailboat designed by John O. Johnson and built by Johnson Boatworks, first launched in 1905.
General
| Builder | Johnson Boatworks |
|---|---|
| Designer | John O. Johnson |
| Years built | 1905 |
| Hull type | twin centerboards |
| Rig type | cat rig |
| Construction | fiberglass |
| Origin | United States |
Dimensions
| LOA | 20.00 ft6.10 m |
|---|---|
| LWL | —— |
| Beam | 7.00 ft2.13 m |
| Draft (max) | 3.30 ft1.01 m |
| Displacement | 650 lb295 kg |
| Ballast | —— |
| Sail Area | 216 ft²20.1 m² |
Design ratios
Computed from the specs above using the standard formulas. Try the sailboat calculators with your own numbers.
SA / Displacement 46.06 Performance / racer — powered up
Capsize Screening 3.23 Better suited to coastal use (> 2.0)
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
$9,500 typical range $7,500 – $11,500
⚠ 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.