Kelt 550
designed by Gilles Ollier · 1978
The Kelt 550 is a 20-foot sailboat designed by Gilles Ollier, first launched in 1978.
General
| Builder | — |
|---|---|
| Designer | Gilles Ollier |
| Years built | 1978 |
| Hull type | — |
| Rig type | — |
| Construction | — |
| Origin | — |
Dimensions
| LOA | 19.59 ft5.97 m |
|---|---|
| LWL | 17.22 ft5.25 m |
| Beam | 8.04 ft2.45 m |
| Draft (max) | 3.61 ft1.10 m |
| Displacement | 1,190 lb540 kg |
| Ballast | —— |
| Sail Area | —— |
Design ratios
Computed from the specs above using the standard formulas. Try the sailboat calculators with your own numbers.
Displacement / Length 104 Light
Comfort Ratio 6.4 Racing / light coastal
Capsize Screening 3.03 Better suited to coastal use (> 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
$10,500 typical range $8,500 – $12,500
⚠ 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.
Data sources: Wikidata (CC0)
