Dormoy 1919
 
Designed by Etienne Dormoy in 1919 as a single place open cockpit biplane experiment in ultralights. A basic framework with wings and a pilot's seat behind the 18hp Henderson motor. The idea was carried over into Dormoy Bathtub.
 
Flown successfully at Selfridge Field, Detroit, only the one was built, sometimes listed as a Packard Motor Co product but actually spare-time project by Dormoy and his co-workers while employed there.