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.
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What is the Southerly 580's sail area to displacement ratio?
The Southerly 580 has a Sail Area to Displacement ratio (SA/D) of 24.06. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.
What is the Southerly 580's comfort ratio?
The Southerly 580 has a Ted Brewer Comfort Ratio of 34.81. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.
Is the Southerly 580 safe for offshore sailing?
The Southerly 580 has a Capsize Screening Formula value of 1.82. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.
What is the hull speed of the Southerly 580?
The theoretical hull speed of the Southerly 580 is 9.63 kn knots, calculated from its waterline length.
How much does a Southerly 580 weigh?
The Southerly 580 has a displacement of 52,910.94 lb and a length overall (LOA) of 58.17 ft.
Who designed the Southerly 580?
The Southerly 580 was designed by Ed Dubois, first built in 2025.