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Atlanta 28

Designer: Csj Roy  ·  Builder: Atlanta Marine (Uk)  ·  First built: 1977
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About the Atlanta 28

Designed by Csj Roy and built by Atlanta Marine in the UK starting in 1977, this 28-footer stands out as a practical coastal cruiser with distinctive twin-keel configuration. The twin keels provide excellent stability in shallow waters and allow the boat to sit upright when beached or dried out, making it particularly appealing for exploring tidal areas and shallow anchorages where traditional deep-draft boats cannot venture. With a displacement of 7,286 pounds and substantial ballast of 3,500 pounds, the Atlanta 28 offers reassuring stability for coastal cruising. The masthead sloop rig carries 275 square feet of sail area, providing adequate power for leisurely sailing while remaining manageable for small crews. Her beam of 9.16 feet creates reasonable interior volume for weekend cruising, while the moderate draft of 4.67 feet (when keels are down) allows access to a wide range of harbors and anchorages. The comfort ratio of 23.66 suggests this is a motion-conscious design suited to those who prefer steady, predictable sailing characteristics over racing performance. The capsize screening formula of 1.89 indicates good stability margins for coastal waters. This fiberglass construction boat appeals particularly to sailors seeking shoal-water capability without sacrificing seaworthiness for protected coastal exploration.

Core Dimensions
LOA (Length Overall) 28.00 ft / 8.53 m
LWL (Waterline Length) 23.58 ft / 7.19 m
Beam 9.16 ft / 2.79 m
Max Draft 4.67 ft / 1.42 m
Displacement 7,286.00 lb / 3,305 kg
Ballast 3,500.00 lb / 1,588 kg
Sail Area (Reported) 275.00 ft² / 25.55 m²
Design & Construction
Hull Type Twin Keel
Rigging Type Masthead Sloop
Construction FG
Designer CSJ Roy
Builder Atlanta Marine (UK)
First Built 1977
Related Sailboats Southerly 28 · Seal 28 · Impala 28 Thomas · Grampian 28 · Aloha 28
Owner Reviews

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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
11.74
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
48.04
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
248.09
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
23.66
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
1.89
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. 6.51 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. 771.77 pounds/inch
Engine & Accommodations
Engine Make Volvo
Engine Model 2002
Engine Type Diesel
Fuel Capacity 16 gals / 61 L
How It Compares

vs. Aloha 28, Grampian 28, Impala 28 Thomas, Seal 28, Southerly 28

This boat Similar boats
Dimensions
LOA
Atlanta 28 ★
28.0 ft
Aloha 28
28.0 ft
Grampian 28
28.0 ft
Impala 28 Thomas
28.0 ft
Seal 28
28.0 ft
Southerly 28
28.0 ft
LWL
Atlanta 28 ★
23.6 ft
Aloha 28
24.5 ft
Grampian 28
24.5 ft
Impala 28 Thomas
23.2 ft
Seal 28
21.9 ft
Southerly 28
24.0 ft
Beam
Atlanta 28 ★
9.2 ft
Aloha 28
9.4 ft
Grampian 28
9.5 ft
Impala 28 Thomas
9.3 ft
Seal 28
9.8 ft
Southerly 28
9.0 ft
Displacement
Atlanta 28 ★
7 lbs
Aloha 28
6 lbs
Grampian 28
6 lbs
Impala 28 Thomas
4 lbs
Seal 28
7 lbs
Southerly 28
8 lbs
Ballast
Atlanta 28 ★
3 lbs
Aloha 28
3 lbs
Grampian 28
3 lbs
Impala 28 Thomas
Seal 28
2 lbs
Southerly 28
Sail Area
Atlanta 28 ★
275 sq ft
Aloha 28
373 sq ft
Grampian 28
Impala 28 Thomas
335 sq ft
Seal 28
310 sq ft
Southerly 28
Performance
PHRF Rating (lower = faster)
Atlanta 28 ★
Aloha 28
195 s/nm
Grampian 28
198 s/nm
Impala 28 Thomas
Seal 28
Southerly 28
SA / Displacement (higher = more powerful)
Atlanta 28 ★
11.7
Aloha 28
16.8
Grampian 28
Impala 28 Thomas
20.3
Seal 28
13.3
Southerly 28
Ballast / Disp (higher = stiffer)
Atlanta 28 ★
48.0 %
Aloha 28
44.4 %
Grampian 28
44.4 %
Impala 28 Thomas
Seal 28
40.3 %
Southerly 28
Comfort Ratio (higher = more comfortable offshore)
Atlanta 28 ★
23.7
Aloha 28
20.6
Grampian 28
Impala 28 Thomas
13.9
Seal 28
22.3
Southerly 28
27.9
Capsize Screening (lower = safer)
Atlanta 28 ★
1.89
Aloha 28
2.00
Grampian 28
Impala 28 Thomas
2.28
Seal 28
2.04
Southerly 28
1.77
Displacement / Length (lower = lighter)
Atlanta 28 ★
248
Aloha 28
204
Grampian 28
209
Impala 28 Thomas
154
Seal 28
306
Southerly 28
274
Hull Speed
Atlanta 28 ★
6.5 kts
Aloha 28
6.6 kts
Grampian 28
Impala 28 Thomas
6.5 kts
Seal 28
6.3 kts
Southerly 28
6.6 kts
Speed Number (higher = faster)
Atlanta 28 ★
Aloha 28
2.6
Grampian 28
Impala 28 Thomas
3.8
Seal 28
Southerly 28
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