After 1943 the letters AN were included to indicate the engine met both Army/Air Force and Navy requirements. Letters were used between 19 then suffixes were numerals with odd number for Army and later Air Force engines and even numbers for Navy engines. Some early engines had the type letter prefixed by a modification letterĭisplacement A number related to the engine displacement within 5 cubic inches. ![]() Type Prefix The type prefix is based on the engine disposition: H ![]() The United States military aircraft engine designation system was introduced in 1926, originally for piston engines it was expanded in the 1947 to include a separate system for jet and rocket engines.Ī piston engine designation has three separate elements, a type prefix, a number representing engine displacement and a model number.
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