OK Dinghy
designed by Knud Olsen
centerboarder
The OK Dinghy is a 13-foot sailboat designed by Knud Olsen.
General
| Builder | — |
|---|---|
| Designer | Knud Olsen |
| Years built | — |
| Hull type | centerboarder |
| Rig type | — |
| Construction | plywood |
| Origin | — |
Dimensions
| LOA | 13.12 ft4.00 m |
|---|---|
| LWL | —— |
| Beam | 4.66 ft1.42 m |
| Draft (max) | 2.99 ft0.91 m |
| Displacement | 187 lb85 kg |
| Ballast | —— |
| Sail Area | —— |
Design ratios
Computed from the specs above using the standard formulas. Try the sailboat calculators with your own numbers.
Capsize Screening 3.26 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
$6,500 typical range $5,000 – $8,000
⚠ 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.
Data sources: Wikidata (CC0)
