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Four 21
Designer: John Powell  ·  First built: 1964
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About the Four 21

With limited specifications available, the Four 21 represents a compact sailing vessel that likely falls into the small cruiser or daysailer category based on its numerical designation. This boat appears to be designed for recreational sailing enthusiasts seeking an accessible entry point into the sport or experienced sailors wanting a manageable vessel for day trips and weekend adventures. Given its size class, the Four 21 would be well-suited for coastal sailing, protected waters, and daysailing activities. The boat's design likely emphasizes ease of handling and simplicity, making it an attractive option for single-handed sailing or small crew operations. Its compact dimensions would facilitate launching and retrieval at various boat ramps, while also keeping maintenance requirements relatively modest. While detailed historical context remains elusive due to limited documentation, boats in this size range typically feature practical layouts optimized for day use, with possible basic overnight accommodations. The Four 21 would appeal to sailors prioritizing affordability and simplicity over extensive cruising amenities, making it potentially suitable for sailing instruction, casual recreation, or as a stepping stone to larger vessels.

Core Dimensions
LOA (Length Overall) 21.50 ft / 6.55 m
LWL (Waterline Length) 19.50 ft / 5.94 m
Beam 7.25 ft / 2.21 m
Max Draft 2.50 ft / 0.76 m
Displacement 3,584.00 lb / 1,626 kg
Ballast 1,125.00 lb / 510 kg
Design & Construction
Hull Type Twin Keel
Rigging Type Masthead Sloop
Construction FG
Designer John Powell
First Built 1964
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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
31.39
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
215.78
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. 3.03 pounds/inch
Rig Dimensions
I (Foretriangle Height) 31.39
P (Mainsail Luff) Diesel
E (Mainsail Foot) 215.78
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