06/05/2016. Remarks by Johan Visschedijk: "After Ralph Denien had finished his Sparrow Hawk he made construction drawings available to other amateur builders. Reportedly only one aircraft was completed, this was built by Douglas C. Leavens of King City, Ontario, Canada in 1969. It was registered CF-ASQ on July, 8, 1970; the registration was cancelled July 11, 1997."