John Harmon in the United States designed a development of the Vans RV-4 known as the Rocket II, having previously designed and built the Rocket

The Tomtit was designed to replace the Avro 504N as a training aircraft, and was built with an all-metal airframe.

William Ewart Hart was born on 20 April 1885 at Parramatta, NSW. He was a dentist who had an interest in flight and who contributed much to early aviation in Australia.

The Alpha is one of series of light aircraft produced by HB-Flugtechnik in Austria, the others designs including the Amigo, Cubby, the Dandy, and a two-seat mid-wing high-performance aircraft known as the Tornado which has a pusher engine driving a five-blade propeller and is fitted with a retractable undercarriage.

The CB-1 is a two-seat light aerobatic biplane produced in kit form for the American Hatz Association of Gurnea, Illinois.

Developed by Martin Hollmann of Orlando, Florida, a senior design engineer in the aerospace industry, the HA-2M Sportster [also known as the Hollmann Sportster] was claimed to be the first two-seat gyroplane designed for the homebuilder who has access to a minimum of power tools.

The Series 600 was introduced to the market in 1971 and was powered by two 3,750 lbst Viper 600 series engines with a two-stage turbine.