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Seamaster Sailer 23
Designer: Laurent Giles  ·  Builder: Seamaster Ltd. (Uk)  ·  First built: 1969
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About the Seamaster Sailer 23

Designed by the renowned British firm Laurent Giles and built by Seamaster Ltd. in the UK from 1969 to 1975, this compact 23-footer represents classic British yacht design philosophy of the era. The Sailer 23 combines moderate proportions with thoughtful engineering, featuring a fin keel configuration with transom-hung rudder that provides good maneuverability in tight quarters while maintaining directional stability. With a displacement of 4,960 pounds and 2,000 pounds of ballast, this masthead sloop offers reassuring stability for coastal cruising and day sailing. The boat's sail area of 230 square feet provides adequate power in light to moderate conditions, while the SA/Displacement ratio of 12.69 suggests decent performance without being overly aggressive. Her comfort ratio of 22.24 indicates a relatively stiff, quick motion that's well-suited to experienced sailors. The fiberglass construction has proven durable over the decades, and many examples remain active today. While compact, the 8.25-foot beam provides reasonable accommodation for weekend cruising or extended day sailing. The moderate 3.50-foot draft allows access to shoal waters while maintaining good upwind performance. This yacht appeals to sailors seeking a well-mannered, traditionally designed boat for protected coastal waters and nearby offshore ventures.

Core Dimensions
LOA (Length Overall) 23.00 ft / 7.01 m
LWL (Waterline Length) 19.75 ft / 6.02 m
Beam 8.25 ft / 2.51 m
Max Draft 3.50 ft / 1.07 m
Displacement 4,960.00 lb / 2,250 kg
Ballast 2,000.00 lb / 907 kg
Sail Area (Reported) 230.00 ft² / 21.37 m²
Design & Construction
Hull Type Fin w/transom hung rudder
Rigging Type Masthead Sloop
Construction FG
Designer Laurent Giles
Builder Seamaster Ltd. (UK)
First Built 1969
Last Built 1975
Associations Seamaster Club
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
 12.69
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
 40.32
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
 287.43
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
 22.24
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
 1.94
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. 5.96 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. 582.19 pounds/inch
Engine & Accommodations
Engine Make Bukh
Engine Type Diesel
Horsepower 10
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