Cal 20
Cal Yachts · designed by C. William Lapworth · 1961
fin keel with bulbFractional rigged sloopUnited States
The Cal 20 is a 20-foot fractional rigged sloop sailboat designed by C. William Lapworth and built by Cal Yachts, first launched in 1961.
General
| Builder | Cal Yachts |
|---|---|
| Designer | C. William Lapworth |
| Years built | 1961 |
| Hull type | fin keel with bulb |
| Rig type | Fractional rigged sloop |
| Construction | fiberglass |
| Origin | United States |
Dimensions
| LOA | 20.00 ft6.10 m |
|---|---|
| LWL | 18.00 ft5.49 m |
| Beam | 7.00 ft2.13 m |
| Draft (max) | 3.33 ft1.01 m |
| Displacement | 1,950 lb885 kg |
| Ballast | 900 lb408 kg |
| Sail Area | 195 ft²18.1 m² |
Design ratios
Computed from the specs above using the standard formulas. Try the sailboat calculators with your own numbers.
SA / Displacement 19.99 Cruiser — good all-round performance
Ballast / Displacement 46.2 % Higher = stiffer / more sail-carrying power
Displacement / Length 149 Light
Comfort Ratio 12.1 Racing / light coastal
Capsize Screening 2.24 Better suited to coastal use (> 2.0)
Hull Speed 5.7 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
$10,000 typical range $8,000 – $12,000
⚠ 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.
