Never known for their production of military aircraft, Spartan did build a few primary trainers for the United States Navy.
One of the most successful of early pioneer designs was the Curtiss Pusher series of biplanes.
The two-place side-by-side Ercoupe first enter production just before World War II, with a 65 hp Continental engine.
The BT-14 was a later development of the 440 hp Wright-powered BT-9 basic trainer used by the United States Army Air Corps.
The most successful British fighter of WWI (1,294 “kills”), the Sopwith Camel was also one of the most heavily produced.
The Sch-2 was built in the Soviet Union, with production beginning in 1930.
The Piper PA-16 Clipper is not a common seaplane, but there are a few still out there flying regularly.
With as many as 12 seats, 900 hp, and amphibious capabilities, the S-38 was a very useful airplane.
Built in New York State by the Brunner-Winkle Aircraft Corporation, the Bird biplane began as another of those designs originally powered by a war surplus Curtiss OX-5 engine (scrapped from a Curtiss Jenny).
The four- to six-place Helio Courier was developed from the Helioplane proof-of-concept aircraft (which now resides in the Smithsonian Collection), and has a long list of unique “Short-field Take Off and Landing (S.T.O.L.)” features.