1. Bre.272TOE (Théatres des Operations Extérieures) Version optimised for harsh colonial conditions with Renault 9Fas radial engine, 1 built.

2. The initial M2 model was powered by an air-cooled Wright R-975 radial engine, originally designed for aircraft.

3. The Sukhoi Su-29 is a Russian two-seat aerobatic aircraft with a 268 kW (360 hp) radial engine.

4. By 1928 the Taylor brothers had designed the two-seat Arrowing A-2 Chummy, a small monoplane with a radial engine

5. The radial engine was usually uncowled, although some Stearman operators choose to cowl the engine, most notably the Red Baron Stearman Squadron.

6. The Grumman HU-16 Albatross is a large twin–radial engine amphibious seaplane that was used by the United States Air Force (USAF), the U.S

7. However, it was not until a design was presented using the air-cooled, 14-cylinder BMW 139 radial engine that the Ministry of Aviation's interest was aroused.

8. The Kaiser-Fleetwings A-39 was a project by Kaiser-Fleetwings in the 1942–1943 period for an attack aircraft powered by a single Pratt & Whitney R-2800 radial engine.

9. Development was suspended due to economic problems, and when restarted in 1998, the aircraft was redesigned, reducing the aircraft's size and replacing the originally planned M-14 radial engine with a LOM Praha 337S inline engine.