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Ocean 71
Designer: E.g. Van De Stadt  ·  Builder: Southern Ocean Ltd.  ·  First built: 1970
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About the Ocean 71

Designed for serious offshore and bluewater passagemaking, the Ocean 71 is a large performance cruising sailboat built to handle demanding ocean passages with confidence. As the name suggests, this is a substantial vessel intended for experienced sailors who want the range, comfort, and seakeeping ability to take on extended voyages far from shore. With its size comes an expectation of capable interior accommodations, making the Ocean 71 well suited to liveaboard cruising or long-distance passages where crew comfort over weeks at sea is a genuine priority. Larger sailboats in this category typically benefit from greater stability in rough conditions and the ability to carry substantial stores and equipment for self-sufficient voyaging. While detailed specifications are limited, boats of this class generally attract buyers seeking a serious bluewater platform rather than a weekend coastal cruiser. The Ocean 71 would appeal to those planning circumnavigations or extended offshore adventures where reliability, seaworthiness, and living space matter most. Prospective buyers are encouraged to seek out full documentation and a thorough survey to better understand the individual vessel's history and condition before making a purchase decision.

Core Dimensions
LOA (Length Overall) 71.00 ft / 21.64 m
LWL (Waterline Length) 59.30 ft / 18.07 m
Beam 17.33 ft / 5.28 m
Max Draft 8.25 ft / 2.51 m
Displacement 75,000.00 lb / 34,019 kg
Ballast 20,500.00 lb / 9,299 kg
Sail Area (Reported) 3,100.00 ft² / 288.00 m²
Design & Construction
Hull Type Fin with rudder on skeg
Rigging Type Masthead Ketch
Construction FG
Designer E.G. van de Stadt
Builder Southern Ocean Ltd.
First Built 1970
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Known Issues & What to Watch For

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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
28.02
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
41.35
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
1.65
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. 10.32
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. 3.0
How It Compares

vs. Nicholson 70, Swan 65 Ss Ketch, Swan 76

This boat Similar boats
Dimensions
LOA
Ocean 71 ★
71.0 ft
Nicholson 70
70.0 ft
Swan 65 Ss Ketch
64.6 ft
Swan 76
76.3 ft
LWL
Ocean 71 ★
59.3 ft
Nicholson 70
54.5 ft
Swan 65 Ss Ketch
47.0 ft
Swan 76
61.3 ft
Beam
Ocean 71 ★
17.3 ft
Nicholson 70
17.1 ft
Swan 65 Ss Ketch
16.3 ft
Swan 76
19.0 ft
Displacement
Ocean 71 ★
75 lbs
Nicholson 70
111 lbs
Swan 65 Ss Ketch
70 lbs
Swan 76
98 lbs
Ballast
Ocean 71 ★
20 lbs
Nicholson 70
Swan 65 Ss Ketch
30 lbs
Swan 76
24 lbs
Sail Area
Ocean 71 ★
3 sq ft
Nicholson 70
Swan 65 Ss Ketch
1 sq ft
Swan 76
2 sq ft
Performance
SA / Displacement (higher = more powerful)
Ocean 71 ★
28.0
Nicholson 70
Swan 65 Ss Ketch
17.0
Swan 76
18.4
Ballast / Disp (higher = stiffer)
Ocean 71 ★
Nicholson 70
Swan 65 Ss Ketch
43.7 %
Swan 76
24.3 %
Comfort Ratio (higher = more comfortable offshore)
Ocean 71 ★
41.4
Nicholson 70
Swan 65 Ss Ketch
50.4
Swan 76
45.9
Capsize Screening (lower = safer)
Ocean 71 ★
1.65
Nicholson 70
Swan 65 Ss Ketch
1.58
Swan 76
1.65
Displacement / Length (lower = lighter)
Ocean 71 ★
Nicholson 70
308
Swan 65 Ss Ketch
300
Swan 76
191
Hull Speed
Ocean 71 ★
10.3 kts
Nicholson 70
Swan 65 Ss Ketch
9.2 kts
Swan 76
10.5 kts
Speed Number (higher = faster)
Ocean 71 ★
Nicholson 70
Swan 65 Ss Ketch
1.5
Swan 76
2.6
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