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Amf 2100
Designer: Ted Hood  ·  Builder: Amf (Usa)  ·  First built: 1980
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About the Amf 2100

Designed by renowned naval architect Ted Hood and produced by AMF from 1980 to 1983, this 21-foot fractional sloop represents a thoughtful approach to small boat sailing. The lifting keel configuration makes the AMF 2100 particularly appealing for sailors who need shallow-water capability without sacrificing sailing performance, allowing access to shoal areas and simplified trailering while maintaining the stability benefits of a proper keel when deployed. With a displacement of 2,200 pounds and 850 pounds of ballast, this fiberglass sailboat strikes a reasonable balance between portability and seaworthiness. The comfort ratio of 11.43 suggests a relatively quick motion in waves, typical of lighter displacement boats, while the capsize screening formula of 2.46 indicates good stability characteristics suitable for coastal sailing and protected waters. Hood's design philosophy shines through in the boat's proportions, with a moderate beam and draft that contribute to respectable sailing performance. The fractional sloop rig provides good balance and manageable sail handling for small crews. Best suited for day sailing, weekend cruising, and coastal exploration, the AMF 2100 offers an accessible entry point into quality sailing with the lifting keel adding versatility that many small fixed-keel boats cannot match.

Core Dimensions
LOA (Length Overall) 21.08 ft / 6.43 m
LWL (Waterline Length) 17.58 ft / 5.36 m
Beam 8.00 ft / 2.44 m
Max Draft 4.00 ft / 1.22 m
Min Draft 1.00 ft / 0.30 m
Displacement 2,200.00 lb / 998 kg
Ballast 850.00 lb / 386 kg
Ballast Type Lead
Sail Area (Reported) 209.00 ft² / 19.42 m²
Design & Construction
Hull Type Lifting Keel
Rigging Type Fractional Sloop
Construction FG
Designer Ted Hood
Builder AMF (USA)
First Built 1980
Last Built 1983
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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
 240
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
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
 38.64
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
 180.77
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
 11.43
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. 5.62 kn
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
 3.29
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. 502.52 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. 19.84
Rig Dimensions
I (Foretriangle Height) 23.91 ft / 7.29 m
J (Foretriangle Base) 8.00 ft / 2.44 m
P (Mainsail Luff) 25.25 ft / 7.70 m
E (Mainsail Foot) 9.00 ft / 2.74 m
SA Fore 95.64 ft² / 8.89 m²
SA Main 113.63 ft² / 10.56 m²
SA Total (100%) 209.27 ft² / 19.44 m²
Est. Forestay Length 25.21 ft / 7.68 m
Mast Height (DWL) 27.58 ft / 8.41 m
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