The Deleray Aircraft Works D-5 Sport Plane of 1920 was a single-seat open cockpit biplane powered with a 15hp motorcycle engine. The lower wing slightly shorter. It could be practically any motorcycle motor of 12 hp or more. The slab-sided early ultralight was advertised as "complete set of 18 large plans" for $6.00.

 

Wingspan: 17 ft

Max speed: 65 mph

Stall: 35 mph

Seats: 1