The Aquarius 21 is an American trailerable sailboat that was designed by Peter Barrett as a cruiser and first built in 1969.
[1][2][3][4] The design was also sold in slightly modified form as the Aquarius Pelican from about 1978 and, later, the Balboa 21.
It has a fractional sloop rig, a spooned raked stem, an angled transom, a "pop-top" cabin, a transom-hung rudder controlled by a tiller and a retractable centerboard.
[1][4] The boat is normally fitted with a small 3 to 6 hp (2 to 4 kW) outboard motor for docking and maneuvering.
[1][4] The design has a PHRF racing average handicap of 273 and a hull speed of 5.7 kn (10.6 km/h).