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Atlantic City Cat Boat
Designer: D. Martin  ·  Builder: Mark-O Custom Boats (Usa)  ·  First built: 1980
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About the Atlantic City Cat Boat

Built by Mark-O Custom Boats starting in 1980, this distinctive gaff-rigged catboat represents a modern interpretation of traditional American coastal sailing craft. Designer D. Martin created a beamy, shoal-draft vessel that captures the essence of classic catboat design while incorporating contemporary fiberglass construction techniques. The boat's centerboard trunk configuration and modest 5-foot draft make it ideal for exploring shallow bays, harbors, and coastal waters where deeper-keeled boats cannot venture. Its substantial 11-foot beam provides impressive stability and interior volume for a 24-footer, while the single-handed gaff cat rig offers simplicity and ease of handling that catboat enthusiasts have cherished for generations. With 8,000 pounds of displacement and 2,200 pounds of ballast, this design strikes a balance between stability and performance. The comfort ratio of 22.44 suggests a boat optimized for relaxed coastal cruising rather than racing, while the capsize screening value of 2.2 indicates good stability characteristics for protected waters sailing. The 452 square feet of sail area provides adequate power for coastal exploration and day sailing. This catboat excels as a comfortable weekender for couples or small families seeking to experience traditional sailing in waters from the Chesapeake Bay to New England's protected coastlines.

Core Dimensions
LOA (Length Overall) 24.00 ft / 7.32 m
LWL (Waterline Length) 22.00 ft / 6.71 m
Beam 11.00 ft / 3.35 m
Max Draft 5.00 ft / 1.52 m
Min Draft 2.00 ft / 0.61 m
Displacement 8,000.00 lb / 3,629 kg
Ballast 2,200.00 lb / 998 kg
Sail Area (Reported) 452.00 ft² / 41.99 m²
Headroom 6.17 ft / 1.88 m
Design & Construction
Hull Type Centerboard (Trunk)
Rigging Type Gaff head Cat
Construction FG solid laminate - fabmat
Designer D. Martin
Builder Mark-O Custom Boats (USA)
First Built 1980
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Performance Ratios
SA/Displacement Sail Area to Displacement ratio measures how much sail power a boat has relative to its weight. Higher values mean more performance and speed.
Under 14 — Heavy cruiser, slow14–18 — Cruising sailboat18–22 — Cruiser/racerOver 22 — Performance racer
18.14
Ballast/Displacement Ballast to Displacement ratio shows what percentage of the boat's total weight is ballast. Higher values generally mean better initial stability and stiffer sail carrying.
30–35% — Typical cruiser35–45% — Stiff performance boatOver 45% — Racing oriented
27.5
Displacement/Length Displacement to Length ratio measures how heavy a boat is relative to its waterline length. Lower values mean a lighter, faster boat.
Under 100 — Ultralight racer100–200 — Light cruiser/racer200–300 — Moderate cruiser300–400 — Heavy cruiserOver 400 — Very heavy
335.41
Comfort Ratio Ted Brewer's Comfort Ratio predicts how comfortable a boat will feel in offshore conditions. Higher values mean a steadier, more comfortable motion in a seaway.
Under 20 — Uncomfortably rough20–30 — Acceptable coastal30–40 — Good offshore comfortOver 40 — Very comfortable offshore
22.44
Capsize Screening Formula The USHS Capsize Screening Formula estimates offshore capsize risk. Lower is safer — values under 2.0 are considered acceptable for offshore sailing.
Under 2.0 — Safe for offshore2.0–2.2 — Borderline offshoreOver 2.2 — Coastal use recommended
2.2
Hull Speed Hull Speed is the theoretical maximum speed of a displacement hull, calculated from waterline length. Most cruising sailboats reach this speed in moderate conditions. 6.29 kn
Pounds/Inch Immersion Pounds per Inch Immersion (PPI) tells you how much weight is needed to sink the boat one inch. Useful for calculating how additional gear and stores affect waterline. 864.69 pounds/inch
Rig Dimensions
Mast Height (DWL) 33.00 ft / 10.06 m
Engine & Accommodations
Engine Make BMW
Engine Type Diesel
Horsepower 12
Fuel Capacity 20 gals / 76 L
Water Capacity 25 gals / 95 L
How It Compares

vs. Bridges Point 24, Neptune 24 Cb, Sovereign 24

This boat Similar boats
Dimensions
LOA
Atlantic City Cat Boat ★
24.0 ft
Bridges Point 24
24.0 ft
Neptune 24 Cb
24.0 ft
Sovereign 24
24.0 ft
LWL
Atlantic City Cat Boat ★
22.0 ft
Bridges Point 24
18.7 ft
Neptune 24 Cb
21.0 ft
Sovereign 24
18.5 ft
Beam
Atlantic City Cat Boat ★
11.0 ft
Bridges Point 24
7.8 ft
Neptune 24 Cb
8.0 ft
Sovereign 24
8.0 ft
Displacement
Atlantic City Cat Boat ★
8 lbs
Bridges Point 24
3 lbs
Neptune 24 Cb
3 lbs
Sovereign 24
3 lbs
Ballast
Atlantic City Cat Boat ★
2 lbs
Bridges Point 24
1 lbs
Neptune 24 Cb
1 lbs
Sovereign 24
1 lbs
Sail Area
Atlantic City Cat Boat ★
452 sq ft
Bridges Point 24
278 sq ft
Neptune 24 Cb
250 sq ft
Sovereign 24
241 sq ft
Performance
SA / Displacement (higher = more powerful)
Atlantic City Cat Boat ★
18.1
Bridges Point 24
17.9
Neptune 24 Cb
18.5
Sovereign 24
16.5
Ballast / Disp (higher = stiffer)
Atlantic City Cat Boat ★
27.5 %
Bridges Point 24
48.2 %
Neptune 24 Cb
37.5 %
Sovereign 24
33.3 %
Comfort Ratio (higher = more comfortable offshore)
Atlantic City Cat Boat ★
22.4
Bridges Point 24
19.7
Neptune 24 Cb
14.2
Sovereign 24
17.3
Capsize Screening (lower = safer)
Atlantic City Cat Boat ★
2.20
Bridges Point 24
1.96
Neptune 24 Cb
2.17
Sovereign 24
2.09
Displacement / Length (lower = lighter)
Atlantic City Cat Boat ★
335
Bridges Point 24
270
Neptune 24 Cb
154
Sovereign 24
253
Hull Speed
Atlantic City Cat Boat ★
6.3 kts
Bridges Point 24
5.8 kts
Neptune 24 Cb
6.1 kts
Sovereign 24
5.8 kts
Speed Number (higher = faster)
Atlantic City Cat Boat ★
Bridges Point 24
Neptune 24 Cb
3.3
Sovereign 24
2.1
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