Atlantic City catboat
Mark-O Custom Boats · designed by D. Martin · 1980
centerboardGaff rigUnited States
The Atlantic City catboat is a 24-foot gaff rig sailboat designed by D. Martin and built by Mark-O Custom Boats, first launched in 1980.
General
| Builder | Mark-O Custom Boats |
|---|---|
| Designer | D. Martin |
| Years built | 1980 |
| Hull type | centerboard |
| Rig type | Gaff rig |
| Construction | fiberglass |
| Origin | United States |
Dimensions
| LOA | 24.00 ft7.32 m |
|---|---|
| LWL | 22.00 ft6.71 m |
| Beam | 11.00 ft3.35 m |
| Draft (max) | 5.00 ft1.52 m |
| Displacement | 8,000 lb3,629 kg |
| Ballast | 2,200 lb998 kg |
| Sail Area | 452 ft²42.0 m² |
Design ratios
Computed from the specs above using the standard formulas. Try the sailboat calculators with your own numbers.
SA / Displacement 18.08 Cruiser — good all-round performance
Ballast / Displacement 27.5 % Higher = stiffer / more sail-carrying power
Displacement / Length 335 Heavy — bluewater displacement
Comfort Ratio 22.4 Coastal cruiser
Capsize Screening 2.20 Better suited to coastal use (> 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
$16,000 typical range $13,000 – $19,000
⚠ 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.
