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She 27
Designer: Sparkman & Stephens  ·  Builder: South Hants Marine (Uk)  ·  First built: 1971
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About the She 27

Designed by the legendary Sparkman & Stephens naval architecture firm, this 26-foot sailboat emerged from South Hants Marine in the UK beginning in 1971. The She 27 represents classic British yacht design principles, combining seaworthiness with performance in a compact package suitable for both coastal cruising and club racing. Built with fiberglass construction and featuring a masthead sloop rig, the design incorporates a fin keel with rudder on skeg configuration that provides excellent directional stability while maintaining good maneuverability. The relatively modest beam of 8.5 feet and displacement of 5,255 pounds create a boat that cuts through water efficiently, with the Sparkman & Stephens pedigree evident in her balanced proportions. With a comfort ratio of 22.06, the She 27 tends toward the sportier end of the spectrum, making her well-suited for spirited day sailing and weekend coastal adventures rather than extended offshore passages. The capsize screening formula of 1.96 indicates reasonable stability for coastal waters. Her sail area to displacement ratio of 15.24 suggests moderate power that will provide satisfying performance in a variety of wind conditions, while remaining manageable for small crews. This design appeals to sailors seeking traditional yacht aesthetics with proven pedigree.

Core Dimensions
LOA (Length Overall) 26.00 ft / 7.92 m
LWL (Waterline Length) 19.25 ft / 5.87 m
Beam 8.50 ft / 2.59 m
Max Draft 4.75 ft / 1.45 m
Displacement 5,255.00 lb / 2,384 kg
Sail Area (Reported) 287.00 ft² / 26.66 m²
Design & Construction
Hull Type Fin with rudder on skeg
Rigging Type Masthead Sloop
Construction FG
Designer Sparkman & Stephens
Builder South Hants Marine (UK)
First Built 1971
Associations Quarter Ton Class
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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
15.24
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
328.88
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
22.06
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
1.96
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. 5.88 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
1.42
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. 584.65 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. 15.25
Rig Dimensions
I (Foretriangle Height) 32.50 ft / 9.91 m
J (Foretriangle Base) 10.00 ft / 3.05 m
P (Mainsail Luff) 28.50 ft / 8.69 m
E (Mainsail Foot) 8.75 ft / 2.67 m
SA Fore 162.50 ft² / 15.10 m²
SA Main 124.69 ft² / 11.58 m²
SA Total (100%) 287.19 ft² / 26.68 m²
Est. Forestay Length 34.00 ft / 10.36 m
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