United States military aero engine designations


United States military aero engine designations

United States military aero engine designations was introduced in 1926, originally for piston engines it was expanded in the 1947 to include a separate system for turbine and rocket engines.

Piston engines

A piston engine designation has three separate elements, a type prefix, a number representating engine displacement and a model number.

;Type Prefix:The type prefix is based on the engine disposition:

;Model number:Odd numbers for the United States Air Force and even numbers for the United States Navy

For example the J79-GE-10 is a Turbojet built by General Electric and is a Navy model.

Rocket engines

Have a similar system to turbine engines but use three basic types:

The prefixes X for experimental and Y for service test are used.

References

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