- 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.
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.
Have a similar system to turbine engines but use three basic types:
The prefixes X for experimental and Y for service test are used.
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