The proposed Autovolantor model has an all-electric version powered by Altairnano batteries.

Proposed version powered by a Pratt & Whitney Wasp engine, not built.

A projected version powered by 5,500ehp Ivchenko AI-30 turboprop engines.

Hand-held versions, sometimes powered by compressed air, are for demolition work or for cutting pipe.

A version powered by a petrol engine has also been produced.

A new version powered by ramjets instead of a rocket engine was developed, usually known as the Keldysh bomber, but not produced.

Basic version, powered by 48 kW (64 hp) Rotax 582 engine.

All of them used the same 1.8-litre engine, with different designations according to horsepower levels, including a version powered by natural gas.

Single-engined version, powered by a 400-hp (298-kW) Liberty engine; three built.

Model 309 King Cobra: Experimental version powered by two engines.