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Seal Sinbad
Designer: Angus Primrose  ·  Builder: John Baker Ltd. (Uk)  ·  First built: 1971
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About the Seal Sinbad

Designed by the renowned Angus Primrose and built by John Baker Ltd. in the UK starting in 1971, this compact 22-footer represents classic British pocket cruiser design philosophy. The Sinbad's lifting keel configuration makes it particularly appealing for sailors who need versatility in their cruising grounds, allowing access to shallow harbors and beaching opportunities while maintaining respectable sailing performance in deeper waters. With its moderate displacement of 2,400 pounds and 800-pound ballast, the boat strikes a practical balance between seaworthiness and trailerable convenience. The masthead sloop rig with 200 square feet of sail area provides adequate power for coastal cruising and weekend adventures, while the comfort ratio of 12.67 suggests quick motion in choppy conditions—typical of smaller vessels but manageable for experienced sailors. The fiberglass construction has proven durable over the decades, and many examples remain active today. While not designed for extensive offshore passages, the Sinbad excels as a coastal cruiser and day sailor, offering genuine sailing character in a compact package. The lifting keel feature particularly suits sailors exploring tidal waters, shallow bays, or those requiring trailer mobility between sailing areas.

Core Dimensions
LOA (Length Overall) 21.75 ft / 6.63 m
LWL (Waterline Length) 18.00 ft / 5.49 m
Beam 7.75 ft / 2.36 m
Max Draft 3.83 ft / 1.17 m
Min Draft 2.00 ft / 0.61 m
Displacement 2,400.00 lb / 1,089 kg
Ballast 800.00 lb / 363 kg
Ballast Type Iron
Sail Area (Reported) 200.00 ft² / 18.58 m²
Design & Construction
Hull Type Lifting Keel
Rigging Type Masthead Sloop
Construction FG
Designer Angus Primrose
Builder John Baker Ltd. (UK)
First Built 1971
Associations Parker & Seal Sailing Association
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
 17.89
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
 33.33
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
 183.72
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
 12.67
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
 2.32
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. 5.69 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. 498.45 pounds/inch
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