BoatsAmerican 21 (AMI)

American 21 (AMI)

Masthead Sloop · Fin w/transom Hung Rudder · First built 1979

An Arthur S. Henry-designed masthead sloop with a shallow 0.66m draft, built for shoal-water cruising since 1979

Designed by Arthur S. Henry.

LOA
Beam
Draft (max)
Displacement
Ballast
Hull type
Fin w/transom Hung Rudder

Is it for you?

Character

Where this design lands on the numbers a shopper trusts — read straight from her own ratios.

TrailerableBeam 2.39 m — inside the 2.55 m no-permit tow width across most of Europe, and the 2.59 m US and Canadian limit. About 1,134 kg of hull, so roughly 1,750 kg on a trailer: check that against your own towing rating.Ramp-launchableAbout 1,134 kg of hull, with a keel that raises or a draft shallow enough to float off a trailer — she can go back on the trailer at the ramp, not only into the water.Shoal draftDraws 0.66 m, board up where she has one — creeks, sandbars and thin anchorages most keels have to stay out of.
LivelySea-kindly

Her moderate displacement on a beamy beam gives 13 — a quick, lively motion that feels every wave.

Comfort ratio 13
CoastalBluewater

At 2.31 she sits above the 2.0 line — beamy for her weight, and happiest coastal.

Capsize screening 2.31
LightHeavy

202 — moderately heavy for her waterline, a balanced cruising weight.

Displacement / length 202
EasygoingPowered-up

17.1 — moderate power for her weight; steady, all-round performance.

Sail area / displacement 17.1
TenderStiff

36% of her weight is ballast — moderately stiff, a middle-of-the-road stability.

Ballast 36%

A balanced, easily-driven cruiser — comfortable and forgiving for coastal work.

  • Draws less than ~94% of boats her size on file

Compared with 665 boats of the same type within a quarter of her length.

The record

Full specifications

The complete reference set — tap any figure to switch between metric and imperial.

Dimensions
Weights
Ballast / displacement
36.0%
Rig & sail area
Rig
Masthead Sloop
Ratios
SA / displacement
17.1
Displacement / length
202.3
Comfort ratio
13.4
Capsize screening
2.31
Hull speed
5.6 kn
Pounds / inch immersion
494
Hull
Hull type
Fin w/transom hung rudder
Construction
Fiberglass
Production
Years built
First built 1979
Designer
Arthur S. Henry
Builder
American Mariner Industries

Boats like this, on the water

Nobody has filmed this one — but these are close.

Comparable boats the fleet has on camera: same type, within a quarter of her length. Open the boat, or watch the video — a timestamp means she only appears in passing.

Halcyon 236.93 mSame hull family0.6 m longerA triple-keeled masthead sloop by Alan H. Buchanan, offering shallow-draft versatility based on the earlier Crystal 23
Marieholm Boats S-206.00 mSame hull family0.3 m shorterA short-run 1970s fractional sloop with a fin keel and transom-hung rudder, designed for coastal agility
Bavaria Yachts 6066.50 mSame hull family0.2 m longerA lightweight 6.5-meter fractional sloop with a high sail-area-to-displacement ratio for spirited coastal sailing
J Boats Tillotson Pearson J/247.32 mSame hull family1.0 m longerThe world's most popular one-design keelboat, featuring a light 1406kg displacement for responsive, agile handling
Cal 257.62 mSame hull family1.3 m longerA flush-deck masthead sloop featuring a pop-top companionway that became one of the most popular models in the fleet
Comet 7707.70 mSame hull family1.4 m longerA Jean-Marie Finot-designed IOR quarter-tonner with a high sail-area-to-displacement ratio for spirited club racing

The family

Related models

The designs closest to hers — usually the rest of the builder's range, sometimes the same hull sold under another name.

Keep looking

Nothing filmed of this one yet

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