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Sj 27 Oyster
Designer: Stephen Jones  ·  Builder: Oyster  ·  First built: 1981
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About the Sj 27 Oyster

A compact and capable Swedish-built sloop, the SJ 27 Oyster comes from SJ Boats, a manufacturer with a reputation for producing well-crafted cruising sailboats suited to the demanding conditions of Scandinavian waters. Designed with practicality and seaworthiness in mind, this small cruiser appeals to sailors looking for an accessible yet capable vessel for coastal and near-offshore sailing. The SJ 27 Oyster's Scandinavian heritage suggests a design philosophy prioritizing solid construction, predictable handling, and comfort in choppier conditions — qualities that have long defined the region's boatbuilding tradition. As a day sailor and weekender, it strikes a balance between ease of single-handed handling and enough accommodation for short passages or overnight trips. For buyers exploring the used market, the SJ 27 Oyster represents an entry point into genuine cruising capability without the complexity of a larger vessel. Its manageable size makes it an appealing choice for those stepping up from dinghies or seeking a low-maintenance cruiser. Prospective buyers are encouraged to seek out a thorough survey to assess individual vessel condition and confirm outfitting details.

Core Dimensions
LOA (Length Overall) 26.90 ft / 8.20 m
LWL (Waterline Length) 25.59 ft / 7.80 m
Beam 10.17 ft / 3.10 m
Max Draft 4.59 ft / 1.40 m
Displacement 4,600.00 lb / 2,087 kg
Design & Construction
Hull Type Fin w/spade rudder
Rigging Type Masthead Sloop
Construction FG
Designer Stephen Jones
Builder Oyster
First Built 1981
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Performance Ratios
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
12.46
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
2.45
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. 6.78
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. 929.9
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