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American 21
Designer: Ron Bertholf  ·  Builder: American Fiberglass Corp.  ·  First built: 1973
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About the American 21

Originally designed as an affordable entry point into sailing, this compact 21-footer emerged during an era when manufacturers sought to create accessible yet capable small boats for weekend sailors and new enthusiasts. The American 21 represents classic small boat design philosophy, prioritizing simplicity and ease of handling over complex systems. Built with recreational sailing in mind, this vessel excels in protected waters and light coastal conditions. Her modest size makes her ideal for day sailing, sailing instruction, and casual weekend outings. The boat's straightforward rigging and manageable sail plan create an excellent platform for learning fundamental sailing skills without overwhelming novice sailors. The design emphasizes practical considerations typical of budget-conscious production boats from her era. Her trailer-friendly dimensions allow owners to explore different sailing venues easily, while her relatively simple construction keeps maintenance requirements reasonable. The cockpit layout prioritizes functionality for small crew sailing, making her suitable for couples or small families seeking sailing adventures. While not intended for serious offshore work or competitive racing, the American 21 serves admirably as a stepping stone boat for those developing their sailing skills or seeking uncomplicated recreational sailing experiences in familiar waters.

Core Dimensions
LOA (Length Overall) 21.00 ft / 6.40 m
LWL (Waterline Length) 17.67 ft / 5.39 m
Beam 8.00 ft / 2.44 m
Max Draft 4.00 ft / 1.22 m
Min Draft 1.50 ft / 0.46 m
Displacement 2,200.00 lb / 998 kg
Ballast 550.00 lb / 249 kg
Sail Area (Reported) 209.00 ft² / 19.42 m²
Design & Construction
Hull Type Lifting Keel
Rigging Type Masthead Sloop
Construction FG
Designer Ron Bertholf
Builder American Fiberglass Corp.
First Built 1973
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Performance Ratios
PHRF Rating PHRF (Performance Handicap Racing Fleet) is a national racing handicap measured in seconds per nautical mile. Lower values indicate faster boats. Ratings are sourced from US Sailing's national database (median across 60+ regional fleets).
Under 0 — Ultralight racer0–90 — Performance racer90–150 — Cruiser/racer150–210 — Typical cruiserOver 210 — Heavy/slow cruiser
306
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
19.82
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
11.41
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
2.46
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. 5.63
S# (Speed Number) The Speed Number (S#) is a quick performance index. Higher values indicate a faster, more powerful design relative to its size.
Under 3.0 — Slow cruiser3.0–5.0 — Average cruiser5.0–7.0 — Performance cruiserOver 7.0 — Racer
3.14
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. 505.09
Rig Dimensions
I (Foretriangle Height) 25.1
J (Foretriangle Base) 8.25
P (Mainsail Luff) 23.1
E (Mainsail Foot) 7.75
SA Fore 103.54
SA Main 89.51
How It Compares

vs. Balboa 21, Buccaneer 210, Clipper Marine 21

This boat Similar boats
Dimensions
LOA
American 21 ★
21.0 ft
Balboa 21
21.0 ft
Buccaneer 210
20.8 ft
Clipper Marine 21
20.9 ft
LWL
American 21 ★
17.7 ft
Balboa 21
18.3 ft
Buccaneer 210
18.3 ft
Clipper Marine 21
16.7 ft
Beam
American 21 ★
8.0 ft
Balboa 21
7.9 ft
Buccaneer 210
8.0 ft
Clipper Marine 21
7.3 ft
Displacement
American 21 ★
2 lbs
Balboa 21
2 lbs
Buccaneer 210
3 lbs
Clipper Marine 21
1 lbs
Ballast
American 21 ★
550 lbs
Balboa 21
665 lbs
Buccaneer 210
900 lbs
Clipper Marine 21
410 lbs
Sail Area
American 21 ★
209 sq ft
Balboa 21
178 sq ft
Buccaneer 210
191 sq ft
Clipper Marine 21
192 sq ft
Performance
PHRF Rating (lower = faster)
American 21 ★
306 s/nm
Balboa 21
Buccaneer 210
282 s/nm
Clipper Marine 21
270 s/nm
SA / Displacement (higher = more powerful)
American 21 ★
19.8
Balboa 21
18.0
Buccaneer 210
14.7
Clipper Marine 21
20.8
Comfort Ratio (higher = more comfortable offshore)
American 21 ★
11.4
Balboa 21
10.3
Buccaneer 210
15.2
Clipper Marine 21
11.1
Capsize Screening (lower = safer)
American 21 ★
2.46
Balboa 21
2.52
Buccaneer 210
2.22
Clipper Marine 21
2.39
Hull Speed
American 21 ★
5.6 kts
Balboa 21
5.7 kts
Buccaneer 210
5.7 kts
Clipper Marine 21
5.5 kts
Speed Number (higher = faster)
American 21 ★
3.1
Balboa 21
3.3
Buccaneer 210
2.3
Clipper Marine 21
3.5
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