Cal 21

[1][2][3] The design was built by Jensen Marine/Cal Yachts, a division of Bangor Punta Corp. in the United States.

It has a fractional sloop rig; a raked stem; a reverse transom; a transom-hung mahogany, non-folding rudder, controlled by a tiller and a swing keel.

[1][3] The boat has a draft of 4.30 ft (1.31 m) with the keel extended and 10 in (25 cm) with it retracted, allowing beaching or ground transportation on a trailer.

[1][3] The swing keel is lowered from a slot in the hull, which is then plugged with a cover that sealed the opening to reduce drag.

[3] In a 2010 review Steve Henkel wrote, "In good weather a pair of sleepers can be accommodated on her unusually spacious (eight feet long) cockpit seats, Worst features: The mahogany rudder is detachable but not folding, a potential problem in shallows.