Heinonen HK-1

HK-1
Role Sport aircraft
National origin Finland
Designer Juhani Heinonen
First flight August 1954
Status Sole example in the Finnish Aviation Museum
Number built 3

The Heinonen HK-1 Keltiäinen is a Finnish single-seat, single-engined sport aircraft of the 1950s. Three examples were built. The first was used by its designer to set a class distance record in 1957 that stood for 27 years before being beaten.