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Southern Cross 28
Designer: Thomas Gillmer  ·  Builder: C. E. Ryder (Usa)  ·  First built: 1978
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About the Southern Cross 28

Designed by renowned naval architect Thomas Gillmer and built by C. E. Ryder beginning in 1978, this 30-foot cutter represents classic American cruising design philosophy from the late 1970s. The fiberglass construction combines traditional aesthetics with modern materials, featuring a fin keel with rudder on skeg configuration that balances directional stability with reasonable performance. With a displacement of 8,500 pounds and 3,400 pounds of ballast, this boat offers the substantial feel that serious cruisers appreciate for offshore passages. The generous beam of 8.5 feet provides comfortable interior volume while maintaining seaworthiness. The cutter rig configuration, with its 415 square feet of sail area, delivers excellent versatility for varying wind conditions and the ability to balance the boat under different sail combinations. Gillmer's design emphasizes seaworthiness over speed, evident in the conservative sail area to displacement ratio and moderate comfort ratio of 32.66, making extended passages more pleasant. The capsize screening formula of 1.67 indicates good stability characteristics for coastal and offshore cruising. With an 11-horsepower auxiliary engine, this yacht suits sailors seeking a traditional, well-built platform for serious cruising adventures rather than racing performance.

Core Dimensions
LOA (Length Overall) 30.42 ft / 9.27 m
LWL (Waterline Length) 20.17 ft / 6.15 m
Beam 8.50 ft / 2.59 m
Max Draft 4.67 ft / 1.42 m
Displacement 8,500.00 lb / 3,856 kg
Ballast 3,400.00 lb / 1,542 kg
Ballast Type Lead
Sail Area (Reported) 415.00 ft² / 38.55 m²
Headroom 6.17 ft / 1.88 m
Design & Construction
Hull Type Fin with rudder on skeg
Rigging Type Cutter
Construction FG
Designer Thomas Gillmer
Builder C. E. Ryder (USA)
First Built 1978
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Performance Ratios
PHRF Rating PHRF (Performance Handicap Racing Fleet) is a national racing handicap measured in seconds per nautical mile. Lower values indicate faster boats. Ratings are sourced from US Sailing's national database (median across 60+ regional fleets).
Under 0 — Ultralight racer0–90 — Performance racer90–150 — Cruiser/racer150–210 — Typical cruiserOver 210 — Heavy/slow cruiser
246
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
15.99
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
40
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
462.44
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
32.66
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
1.67
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. 6.02 kn
S# (Speed Number) The Speed Number (S#) is a quick performance index. Higher values indicate a faster, more powerful design relative to its size.
Under 3.0 — Slow cruiser3.0–5.0 — Average cruiser5.0–7.0 — Performance cruiserOver 7.0 — Racer
0.74
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. 612.59 pounds/inch
SA/Displacement (Calc) Calculated Sail Area to Displacement ratio using actual measured sail dimensions rather than reported values. More precise than the reported SA/Disp figure. 13.97
Rig Dimensions
I (Foretriangle Height) 33.00 ft / 10.06 m
J (Foretriangle Base) 12.00 ft / 3.66 m
P (Mainsail Luff) 28.00 ft / 8.53 m
E (Mainsail Foot) 11.75 ft / 3.58 m
SA Fore 198.00 ft² / 18.39 m²
SA Main 164.50 ft² / 15.28 m²
SA Total (100%) 362.50 ft² / 33.68 m²
Est. Forestay Length 35.11 ft / 10.70 m
Engine & Accommodations
Engine Make Universal
Engine Type Diesel
Horsepower 11
Fuel Capacity 15 gals / 57 L
Water Capacity 47 gals / 178 L
How It Compares

vs. Cape Dory 30 Mk Ii, Nonsuch 30, Seawind Allied

This boat Similar boats
Dimensions
LOA
Southern Cross 28 ★
30.4 ft
Cape Dory 30 Mk Ii
30.5 ft
Nonsuch 30
30.3 ft
Seawind Allied
30.5 ft
LWL
Southern Cross 28 ★
20.2 ft
Cape Dory 30 Mk Ii
24.2 ft
Nonsuch 30
28.8 ft
Seawind Allied
24.0 ft
Beam
Southern Cross 28 ★
8.5 ft
Cape Dory 30 Mk Ii
10.5 ft
Nonsuch 30
11.9 ft
Seawind Allied
9.3 ft
Displacement
Southern Cross 28 ★
8 lbs
Cape Dory 30 Mk Ii
10 lbs
Nonsuch 30
10 lbs
Seawind Allied
12 lbs
Ballast
Southern Cross 28 ★
3 lbs
Cape Dory 30 Mk Ii
4 lbs
Nonsuch 30
4 lbs
Seawind Allied
4 lbs
Sail Area
Southern Cross 28 ★
415 sq ft
Cape Dory 30 Mk Ii
Nonsuch 30
540 sq ft
Seawind Allied
502 sq ft
Performance
PHRF Rating (lower = faster)
Southern Cross 28 ★
246 s/nm
Cape Dory 30 Mk Ii
192 s/nm
Nonsuch 30
174 s/nm
Seawind Allied
SA / Displacement (higher = more powerful)
Southern Cross 28 ★
16.0
Cape Dory 30 Mk Ii
Nonsuch 30
18.1
Seawind Allied
15.4
Ballast / Disp (higher = stiffer)
Southern Cross 28 ★
40.0 %
Cape Dory 30 Mk Ii
40.0 %
Nonsuch 30
Seawind Allied
35.0 %
Comfort Ratio (higher = more comfortable offshore)
Southern Cross 28 ★
32.7
Cape Dory 30 Mk Ii
Nonsuch 30
20.5
Seawind Allied
36.9
Capsize Screening (lower = safer)
Southern Cross 28 ★
1.67
Cape Dory 30 Mk Ii
Nonsuch 30
2.18
Seawind Allied
1.62
Displacement / Length (lower = lighter)
Southern Cross 28 ★
462
Cape Dory 30 Mk Ii
331
Nonsuch 30
Seawind Allied
387
Hull Speed
Southern Cross 28 ★
6.0 kts
Cape Dory 30 Mk Ii
Nonsuch 30
7.2 kts
Seawind Allied
6.6 kts
Speed Number (higher = faster)
Southern Cross 28 ★
0.7
Cape Dory 30 Mk Ii
Nonsuch 30
2.9
Seawind Allied
1.0
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