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Sj 30 Oyster
Designer: Stephen Jones  ·  Builder: Oyster Marine (Uk)/Verlvale Ltd  ·  First built: 1979
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About the Sj 30 Oyster

A compact Swedish cruiser-racer with a loyal following in Scandinavian waters, the Sj 30 Oyster is a capable and versatile sailboat well suited to coastal cruising and inshore racing. Built with the practical demands of Baltic sailing in mind, this design reflects the Swedish tradition of producing sturdy, seaworthy boats that balance performance with comfort in a manageable package. Although detailed specifications are limited, the Sj 30 Oyster carries the reputation of a well-rounded day sailor and weekend cruiser that appeals to both families and performance-minded sailors. Its size makes it approachable for a small crew or experienced solo sailor, while still offering enough interior space for short offshore passages and overnight stays. Buyers researching this model often appreciate its straightforward handling characteristics and durable construction, qualities that have helped it maintain a presence in the used boat market. For sailors seeking an affordable entry point into keelboat ownership with Scandinavian build quality and the flexibility to race competitively or cruise comfortably, the Sj 30 Oyster deserves a close look.

Core Dimensions
LOA (Length Overall) 30.42 ft / 9.27 m
LWL (Waterline Length) 25.00 ft / 7.62 m
Beam 10.75 ft / 3.28 m
Max Draft 5.33 ft / 1.62 m
Displacement 6,500.00 lb / 2,948 kg
Ballast 2,663.00 lb / 1,208 kg
Sail Area (Reported) 410.00 ft² / 38.09 m²
Design & Construction
Hull Type Fin w/spade rudder
Rigging Type Fractional Sloop
Construction FG
Designer Stephen Jones
Builder Oyster Marine (UK)/Verlvale Ltd
First Built 1979
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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
18.89
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
15.96
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
2.31
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. 6.7
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
3.11
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. 960.27
Rig Dimensions
I (Foretriangle Height) 33.0
J (Foretriangle Base) 10.2
P (Mainsail Luff) 36.5
E (Mainsail Foot) 13.25
SA Fore 168.3
SA Main 241.81
How It Compares

vs. Cape Dory 30 Mk Ii, Nonsuch 30, Oceanis 301 Beneteau

This boat Similar boats
Dimensions
LOA
Sj 30 Oyster ★
30.4 ft
Cape Dory 30 Mk Ii
30.5 ft
Nonsuch 30
30.3 ft
Oceanis 301 Beneteau
30.5 ft
LWL
Sj 30 Oyster ★
25.0 ft
Cape Dory 30 Mk Ii
24.2 ft
Nonsuch 30
28.8 ft
Oceanis 301 Beneteau
26.3 ft
Beam
Sj 30 Oyster ★
10.8 ft
Cape Dory 30 Mk Ii
10.5 ft
Nonsuch 30
11.9 ft
Oceanis 301 Beneteau
10.8 ft
Displacement
Sj 30 Oyster ★
6 lbs
Cape Dory 30 Mk Ii
10 lbs
Nonsuch 30
10 lbs
Oceanis 301 Beneteau
8 lbs
Ballast
Sj 30 Oyster ★
2 lbs
Cape Dory 30 Mk Ii
4 lbs
Nonsuch 30
4 lbs
Oceanis 301 Beneteau
3 lbs
Sail Area
Sj 30 Oyster ★
410 sq ft
Cape Dory 30 Mk Ii
Nonsuch 30
540 sq ft
Oceanis 301 Beneteau
430 sq ft
Performance
PHRF Rating (lower = faster)
Sj 30 Oyster ★
Cape Dory 30 Mk Ii
192 s/nm
Nonsuch 30
174 s/nm
Oceanis 301 Beneteau
SA / Displacement (higher = more powerful)
Sj 30 Oyster ★
18.9
Cape Dory 30 Mk Ii
Nonsuch 30
18.1
Oceanis 301 Beneteau
16.1
Ballast / Disp (higher = stiffer)
Sj 30 Oyster ★
Cape Dory 30 Mk Ii
40.0 %
Nonsuch 30
Oceanis 301 Beneteau
35.0 %
Comfort Ratio (higher = more comfortable offshore)
Sj 30 Oyster ★
16.0
Cape Dory 30 Mk Ii
Nonsuch 30
20.5
Oceanis 301 Beneteau
Capsize Screening (lower = safer)
Sj 30 Oyster ★
2.31
Cape Dory 30 Mk Ii
Nonsuch 30
2.18
Oceanis 301 Beneteau
Displacement / Length (lower = lighter)
Sj 30 Oyster ★
Cape Dory 30 Mk Ii
331
Nonsuch 30
Oceanis 301 Beneteau
217
Hull Speed
Sj 30 Oyster ★
6.7 kts
Cape Dory 30 Mk Ii
Nonsuch 30
7.2 kts
Oceanis 301 Beneteau
Speed Number (higher = faster)
Sj 30 Oyster ★
3.1
Cape Dory 30 Mk Ii
Nonsuch 30
2.9
Oceanis 301 Beneteau
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