Prospect 900
Rydgeway Marine · designed by Ericus Gerhardus van de Stadt · 1975
lifting keelMasthead sloopNetherlands
The Prospect 900 is a 29-foot masthead sloop sailboat designed by Ericus Gerhardus van de Stadt and built by Rydgeway Marine, first launched in 1975.
General
| Builder | Rydgeway Marine |
|---|---|
| Designer | Ericus Gerhardus van de Stadt |
| Years built | 1975 |
| Hull type | lifting keel |
| Rig type | Masthead sloop |
| Construction | fiberglass |
| Origin | Netherlands |
Dimensions
| LOA | 28.83 ft8.79 m |
|---|---|
| LWL | 22.42 ft6.83 m |
| Beam | 9.17 ft2.80 m |
| Draft (max) | 4.92 ft1.50 m |
| Displacement | 7,275 lb3,300 kg |
| Ballast | 3,086 lb1,400 kg |
| Sail Area | 291 ft²27.0 m² |
Design ratios
Computed from the specs above using the standard formulas. Try the sailboat calculators with your own numbers.
SA / Displacement 12.40 Under-canvassed — heavy-air / motorsailing
Ballast / Displacement 42.4 % Higher = stiffer / more sail-carrying power
Displacement / Length 288 Moderate
Comfort Ratio 24.1 Coastal cruiser
Capsize Screening 1.89 Suited to offshore passages (≤ 2.0)
Hull Speed 6.3 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
$22,500 typical range $18,000 – $27,000
⚠ 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.
