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Southerly 580
Designer: Ed Dubois  ·  Builder: Southerly Yachts (Uk)  ·  First built: 2025
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About the Southerly 580

Ed Dubois brings his renowned design expertise to this impressive 58-foot performance cruiser from Southerly Yachts, launching in 2025 as the newest addition to their distinguished lineup. The Southerly 580 continues the British builder's innovative tradition with its signature swing keel system paired with dual rudders, offering the unique ability to explore shallow waters and dry out on beaches while maintaining excellent sailing performance in deeper waters. Built with modern GRP construction and featuring a Solent rig configuration, this yacht strikes an appealing balance between comfort and capability. The generous beam of over 17 feet provides exceptional interior volume and initial stability, while the substantial displacement suggests serious offshore credentials. With a moderate comfort ratio and favorable capsize screening numbers, the 580 appears well-suited for extended coastal cruising and offshore passages. The swing keel design reduces draft significantly when retracted, opening up countless anchorages typically inaccessible to fixed-keel yachts of this size. Combined with the dual rudder configuration, this creates remarkable versatility for exploring everything from Mediterranean coves to Caribbean shallows. The 140-horsepower engine provides reliable auxiliary power for extended motoring or maneuvering in tight quarters, making this an exceptionally practical choice for serious cruising sailors.

Core Dimensions
LOA (Length Overall) 58.17 ft / 17.73 m
LWL (Waterline Length) 51.67 ft / 15.75 m
Beam 17.09 ft / 5.21 m
Max Draft 10.50 ft / 3.20 m
Min Draft 3.61 ft / 1.10 m
Displacement 52,910.94 lb / 24,000 kg
Ballast 18,408.60 lb / 8,350 kg
Sail Area (Reported) 2,109.73 ft² / 196.00 m²
Design & Construction
Hull Type Swing keel w/dual rudders
Rigging Type Solent
Construction GRP
Designer Ed DuBois
Builder Southerly Yachts (UK)
First Built 2025
Related Sailboats Southerly 590 · Voyage 590 · Oyster 565 · X56 · Jeanneau Yachts 60
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
24.06
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
34.79
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
171.23
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
34.81
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
1.82
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. 9.63 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. 3,155.20 pounds/inch
Rig Dimensions
Mast Height (DWL) 84.97 ft / 25.90 m
Engine & Accommodations
Engine Type Diesel
Horsepower 140
Fuel Capacity 368 gals / 1,392 L
Water Capacity 106 gals / 403 L
How It Compares

vs. Jeanneau Yachts 60, Oyster 565, Southerly 590, Voyage 590, X56

This boat Similar boats
Dimensions
LOA
Southerly 580 ★
58.2 ft
Jeanneau Yachts 60
60.0 ft
Oyster 565
59.4 ft
Southerly 590
58.2 ft
Voyage 590
58.1 ft
X56
56.6 ft
LWL
Southerly 580 ★
51.7 ft
Jeanneau Yachts 60
52.5 ft
Oyster 565
52.3 ft
Southerly 590
52.5 ft
Voyage 590
X56
49.0 ft
Beam
Southerly 580 ★
17.1 ft
Jeanneau Yachts 60
17.7 ft
Oyster 565
16.8 ft
Southerly 590
17.1 ft
Voyage 590
28.4 ft
X56
16.1 ft
Displacement
Southerly 580 ★
52 lbs
Jeanneau Yachts 60
57 lbs
Oyster 565
56 lbs
Southerly 590
58 lbs
Voyage 590
48 lbs
X56
39 lbs
Ballast
Southerly 580 ★
18 lbs
Jeanneau Yachts 60
20 lbs
Oyster 565
14 lbs
Southerly 590
18 lbs
Voyage 590
X56
15 lbs
Sail Area
Southerly 580 ★
2 sq ft
Jeanneau Yachts 60
1,798 sq ft
Oyster 565
1 sq ft
Southerly 590
1 sq ft
Voyage 590
X56
1 sq ft
Performance
SA / Displacement (higher = more powerful)
Southerly 580 ★
24.1
Jeanneau Yachts 60
19.3
Oyster 565
19.3
Southerly 590
17.3
Voyage 590
X56
23.3
Ballast / Disp (higher = stiffer)
Southerly 580 ★
34.8 %
Jeanneau Yachts 60
36.5 %
Oyster 565
Southerly 590
Voyage 590
X56
39.8 %
Comfort Ratio (higher = more comfortable offshore)
Southerly 580 ★
34.8
Jeanneau Yachts 60
34.9
Oyster 565
37.3
Southerly 590
38.3
Voyage 590
X56
29.8
Capsize Screening (lower = safer)
Southerly 580 ★
1.82
Jeanneau Yachts 60
1.84
Oyster 565
1.76
Southerly 590
1.76
Voyage 590
X56
1.89
Displacement / Length (lower = lighter)
Southerly 580 ★
171
Jeanneau Yachts 60
176
Oyster 565
Southerly 590
Voyage 590
X56
151
Hull Speed
Southerly 580 ★
9.6 kts
Jeanneau Yachts 60
9.7 kts
Oyster 565
9.7 kts
Southerly 590
9.7 kts
Voyage 590
X56
9.4 kts
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