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Offshore 39 Tanton

Designer: Tanton  ·  Builder: Offshore Yachts  ·  First built: 1983
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About the Offshore 39 Tanton

Designed by the respected naval architect Yves-Marie Tanton, the Offshore 39 represents a thoughtful approach to bluewater cruising and serious offshore passage-making. Tanton built a reputation for creating well-balanced, seaworthy designs that prioritize safety and comfort at sea without sacrificing sailing performance, and the Offshore 39 reflects that philosophy throughout. While detailed specifications for this model are limited in available records, the boat's name and lineage speak clearly to its intended purpose. As an offshore-oriented design bearing Tanton's signature, prospective buyers can reasonably expect a hull shaped for stability in open-ocean conditions, capable of handling challenging sea states while remaining manageable for a small crew or experienced shorthanded sailors. For those researching a capable bluewater cruiser with a respected pedigree, the Offshore 39 Tanton deserves serious consideration. Buyers interested in this model are encouraged to seek out existing owners and class communities, where firsthand accounts of the boat's sea behavior, construction quality, and long-distance performance can provide valuable insight to complement any formal specifications uncovered during the research process.

Core Dimensions
LOA (Length Overall) 39.25 ft / 11.96 m
LWL (Waterline Length) 35.16 ft / 10.72 m
Beam 12.75 ft / 3.89 m
Max Draft 4.83 ft / 1.47 m
Displacement 18,200.00 lb / 8,255 kg
Ballast 7,000.00 lb / 3,175 kg
Ballast Type Lead
Design & Construction
Hull Type Fin (shoal draft)
Rigging Type Cat Ketch (unstayed)
Construction FG
Designer Tanton
Builder Offshore Yachts
First Built 1983
Owner Reviews

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Known Issues & What to Watch For

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Performance Ratios
Ballast/Displacement Ballast to Displacement ratio shows what percentage of the boat's total weight is ballast. Higher values generally mean better initial stability and stiffer sail carrying.
30–35% — Typical cruiser35–45% — Stiff performance boatOver 45% — Racing oriented
38.46
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
186.93
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. 9.61 pounds/inch
Rig Dimensions
I (Foretriangle Height) 19.03
P (Mainsail Luff) 820.00 ft² / 76.18 m²
E (Mainsail Foot) Diesel
How It Compares

vs. Ericson 39 B, Fast Passage 39, Freedom 39, Passport 40, Valiant 39

This boat Similar boats
Dimensions
LOA
Offshore 39 Tanton ★
39.3 ft
Ericson 39 B
39.0 ft
Fast Passage 39
39.5 ft
Freedom 39
39.0 ft
Passport 40
39.4 ft
Valiant 39
39.3 ft
LWL
Offshore 39 Tanton ★
35.2 ft
Ericson 39 B
30.0 ft
Fast Passage 39
33.5 ft
Freedom 39
31.0 ft
Passport 40
33.4 ft
Valiant 39
32.0 ft
Beam
Offshore 39 Tanton ★
12.8 ft
Ericson 39 B
11.3 ft
Fast Passage 39
11.8 ft
Freedom 39
12.8 ft
Passport 40
12.7 ft
Valiant 39
11.5 ft
Displacement
Offshore 39 Tanton ★
18 lbs
Ericson 39 B
19 lbs
Fast Passage 39
21 lbs
Freedom 39
18 lbs
Passport 40
22 lbs
Valiant 39
18 lbs
Ballast
Offshore 39 Tanton ★
7 lbs
Ericson 39 B
9 lbs
Fast Passage 39
7 lbs
Freedom 39
5 lbs
Passport 40
8 lbs
Valiant 39
7 lbs
Sail Area
Offshore 39 Tanton ★
Ericson 39 B
720 sq ft
Fast Passage 39
799 sq ft
Freedom 39
818 sq ft
Passport 40
762 sq ft
Valiant 39
Performance
PHRF Rating (lower = faster)
Offshore 39 Tanton ★
Ericson 39 B
114 s/nm
Fast Passage 39
132 s/nm
Freedom 39
156 s/nm
Passport 40
141 s/nm
Valiant 39
SA / Displacement (higher = more powerful)
Offshore 39 Tanton ★
Ericson 39 B
16.2
Fast Passage 39
16.9
Freedom 39
18.8
Passport 40
15.2
Valiant 39
Ballast / Disp (higher = stiffer)
Offshore 39 Tanton ★
38.5 %
Ericson 39 B
50.0 %
Fast Passage 39
35.7 %
Freedom 39
28.7 %
Passport 40
37.3 %
Valiant 39
37.8 %
Comfort Ratio (higher = more comfortable offshore)
Offshore 39 Tanton ★
Ericson 39 B
35.4
Fast Passage 39
34.2
Freedom 39
28.6
Passport 40
34.0
Valiant 39
Capsize Screening (lower = safer)
Offshore 39 Tanton ★
Ericson 39 B
1.70
Fast Passage 39
1.72
Freedom 39
1.94
Passport 40
1.79
Valiant 39
Displacement / Length (lower = lighter)
Offshore 39 Tanton ★
186
Ericson 39 B
314
Fast Passage 39
249
Freedom 39
277
Passport 40
272
Valiant 39
252
Hull Speed
Offshore 39 Tanton ★
Ericson 39 B
7.3 kts
Fast Passage 39
7.8 kts
Freedom 39
7.5 kts
Passport 40
7.8 kts
Valiant 39
Speed Number (higher = faster)
Offshore 39 Tanton ★
Ericson 39 B
1.6
Fast Passage 39
2.2
Freedom 39
Passport 40
1.9
Valiant 39
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