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Southerly 430
Designer: Rob Humphreys  ·  Builder: Northshore Yachts Ltd (Uk)  ·  First built: 2010
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About the Southerly 430

Rob Humphreys' design expertise shines through in the Southerly 430, a sophisticated cruising yacht that exemplifies the innovative spirit of Britain's Northshore Yachts. Built from 2010 onward, this 42-foot fractional sloop represents the evolution of the renowned Southerly line, famous for pioneering swing keel technology in serious cruising yachts. The defining characteristic of the Southerly 430 lies in its ingenious swing keel configuration paired with dual rudders, allowing draft reduction from 8.92 feet to just a few feet. This versatility opens up shallow anchorages and tidal waters typically inaccessible to fixed-keel yachts of similar size, making it exceptional for exploring European canals, shallow Caribbean waters, or the intricate coastlines of the British Isles. With a displacement of 25,003 pounds and comfortable beam of 13.22 feet, the 430 strikes an appealing balance between seaworthiness and interior volume. The capsize screening formula of 1.81 and comfort ratio of 32.52 indicate a yacht capable of offshore passages while maintaining reasonable motion at sea. Her 792.45 square feet of sail area provides adequate power, while the 57-horsepower engine ensures reliable auxiliary propulsion in challenging conditions or tight quarters.

Core Dimensions
LOA (Length Overall) 42.19 ft / 12.86 m
LWL (Waterline Length) 36.45 ft / 11.11 m
Beam 13.22 ft / 4.03 m
Max Draft 8.92 ft / 2.72 m
Min Draft 2.76 ft / 0.84 m
Displacement 25,003.00 lb / 11,341 kg
Ballast 8,091.00 lb / 3,670 kg
Sail Area (Reported) 792.45 ft² / 73.62 m²
Design & Construction
Hull Type Swing keel w/dual rudders
Rigging Type Fractional Sloop
Construction GRP
Designer Rob Humphreys
Builder Northshore Yachts Ltd (UK)
First Built 2010
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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
14.89
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
32.36
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
230.49
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
32.52
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
1.81
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. 8.09 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. 1,721.77 pounds/inch
Rig Dimensions
Mast Height (DWL) 61.45 ft / 18.73 m
Engine & Accommodations
Engine Make Yanmar
Engine Model 4JH5E
Engine Type Diesel
Horsepower 57
Fuel Capacity 79 gals / 299 L
Water Capacity 71 gals / 269 L
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