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Offshore 45 Tanton
Designer: Yves-Marie Tanton  ·  Builder: Ta Chiao Ltd. (Taiwan)  ·  First built: 1987
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About the Offshore 45 Tanton

Designed by renowned French naval architect Yves-Marie Tanton and built by Taiwan's respected Ta Chiao yard starting in 1987, this 45-foot sailboat represents a thoughtful approach to offshore cruising. The Offshore 45 showcases Tanton's signature design philosophy of combining seaworthiness with comfortable living spaces for extended voyaging. The boat's most distinctive feature is its cat ketch rig with unstayed masts, offering excellent balance and ease of handling for short-handed crews. This configuration provides redundancy and allows for versatile sail combinations in varying conditions. The fin keel with rudder mounted on a protective skeg delivers good performance while maintaining directional stability, particularly valuable during long passages. With a displacement of nearly 26,000 pounds and substantial ballast ratio, the Offshore 45 prioritizes stability and comfort over racing performance. The moderate sail area-to-displacement ratio of 22.28 indicates this vessel excels in steady, predictable sailing rather than light-air speed. Her fiberglass construction and conservative design make her well-suited for serious cruising, including ocean passages. The boat's comfort ratio of 29.99 suggests motion characteristics favoring habitability, while the capsize screening value of 1.85 falls within acceptable ranges for offshore work, making this Tanton design a solid choice for adventurous cruising couples.

Core Dimensions
LOA (Length Overall) 44.83 ft / 13.66 m
LWL (Waterline Length) 39.42 ft / 12.02 m
Beam 13.67 ft / 4.17 m
Max Draft 4.92 ft / 1.50 m
Displacement 25,920.00 lb / 11,757 kg
Ballast 9,270.00 lb / 4,205 kg
Sail Area (Reported) 1,215.00 ft² / 112.88 m²
Design & Construction
Hull Type Fin with rudder on skeg
Rigging Type Cat Ketch (unstayed)
Construction FG
Designer Yves-Marie Tanton
Builder Ta Chiao Ltd. (TAIWAN)
First Built 1987
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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
 22.28
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
 35.76
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
 188.9
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
 29.99
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
 1.85
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. 8.41 kn
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. 1,925.45 pounds/inch
SA/Displacement (Calc) Calculated Sail Area to Displacement ratio using actual measured sail dimensions rather than reported values. More precise than the reported SA/Disp figure. 7.85
Rig Dimensions
P (Mainsail Luff) 53.50 ft / 16.31 m
E (Mainsail Foot) 16.00 ft / 4.88 m
SA Main 428.00 ft² / 39.76 m²
SA Total (100%) 428.00 ft² / 39.76 m²
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