High Quality Content by WIKIPEDIA articles! The Packard 1A-2500 is an American 12 cylinder liquid-cooled aircraft engine designed in 1924. Of the five variants produced the 3A-2500 was the most numerous. The marine version of this engine was used in most PT boats as the 3M/4M/5M-2500.An aircraft engine is a propulsion system for an aircraft. Aircraft engines are almost always either lightweight piston engines or gas turbines. This article is an overview of the basic types of aircraft engines and the design concepts employed in engine development for aircraft.

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