The Parnall Heck was designed by Basil B. Henderson as a single-engined, conventional low-wing cabin monoplane, built of spruce with a plywood covering, initially a two-seater in tandem layout. The prototype was originally flown as the Hendy Heck but by the time of its first public demonstration in July 1935, the companies had merged and the aircraft was renamed as the Parnall Heck.
The Parnall Heck was designed by Basil B. Henderson as a single-engined, conventional low-wing cabin monoplane, built of spruce with a plywood covering, initially a two-seater in tandem layout. The prototype was originally flown as the Hendy Heck but by the time of its first public demonstration in July 1935, the companies had merged and the aircraft was renamed as the Parnall Heck.