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Offshore 34 Anderson
Designer: Ian Anderson  ·  Builder: Offshore Yachts Ltd.  ·  First built: 1973
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About the Offshore 34 Anderson

Designed with serious passagemaking in mind, the Offshore 34 Anderson is a capable bluewater cruiser that lives up to its "Offshore" designation. Built for sailors who want to venture beyond sheltered coastal waters, this vessel carries a reputation for solid construction and sea-kindly handling that inspires confidence when conditions deteriorate far from port. While detailed specifications for this model are limited in available records, the Anderson name and offshore designation suggest a boat engineered with stability and seakeeping as primary priorities rather than outright speed or racing performance. Sailors drawn to this design are typically those planning extended coastal passages or bluewater adventures where reliability and comfort in a seaway matter most. For prospective buyers researching this vessel, the Offshore 34 Anderson represents an era of purposeful cruising boat design, where the emphasis was placed on getting the crew safely to their destination. Anyone considering this model would do well to seek out existing owners and class associations, as firsthand accounts from experienced sailors who have put these boats through their paces offshore will provide the most valuable insight into real-world performance and long-term ownership.

Core Dimensions
LOA (Length Overall) 34.00 ft / 10.36 m
LWL (Waterline Length) 27.25 ft / 8.31 m
Beam 11.00 ft / 3.35 m
Max Draft 6.00 ft / 1.83 m
Displacement 16,128.00 lb / 7,316 kg
Ballast 6,720.00 lb / 3,048 kg
Sail Area (Reported) 500.00 ft² / 46.45 m²
Design & Construction
Hull Type Fin with rudder on skeg
Rigging Type Masthead Sloop
Construction FG
Designer Ian Anderson
Builder Offshore Yachts Ltd.
First Built 1973
Owner Reviews

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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
12.58
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
34.92
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
1.74
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. 7.0
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. 1.0
How It Compares

vs. Contest 34, Formosa 34, Vulcan 34 Westerly

This boat Similar boats
Dimensions
LOA
Offshore 34 Anderson ★
34.0 ft
Contest 34
34.0 ft
Formosa 34
34.0 ft
Vulcan 34 Westerly
34.0 ft
LWL
Offshore 34 Anderson ★
27.3 ft
Contest 34
27.6 ft
Formosa 34
29.5 ft
Vulcan 34 Westerly
28.4 ft
Beam
Offshore 34 Anderson ★
11.0 ft
Contest 34
11.2 ft
Formosa 34
11.8 ft
Vulcan 34 Westerly
11.8 ft
Displacement
Offshore 34 Anderson ★
16 lbs
Contest 34
16 lbs
Formosa 34
13 lbs
Vulcan 34 Westerly
15 lbs
Ballast
Offshore 34 Anderson ★
6 lbs
Contest 34
7 lbs
Formosa 34
4 lbs
Vulcan 34 Westerly
6 lbs
Sail Area
Offshore 34 Anderson ★
500 sq ft
Contest 34
484 sq ft
Formosa 34
Vulcan 34 Westerly
570 sq ft
Performance
SA / Displacement (higher = more powerful)
Offshore 34 Anderson ★
12.6
Contest 34
12.1
Formosa 34
Vulcan 34 Westerly
14.7
Ballast / Disp (higher = stiffer)
Offshore 34 Anderson ★
Contest 34
Formosa 34
30.9 %
Vulcan 34 Westerly
44.7 %
Comfort Ratio (higher = more comfortable offshore)
Offshore 34 Anderson ★
34.9
Contest 34
34.4
Formosa 34
25.4
Vulcan 34 Westerly
30.1
Capsize Screening (lower = safer)
Offshore 34 Anderson ★
1.74
Contest 34
1.76
Formosa 34
1.99
Vulcan 34 Westerly
1.88
Displacement / Length (lower = lighter)
Offshore 34 Anderson ★
Contest 34
Formosa 34
236
Vulcan 34 Westerly
303
Hull Speed
Offshore 34 Anderson ★
7.0 kts
Contest 34
7.0 kts
Formosa 34
7.3 kts
Vulcan 34 Westerly
7.1 kts
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