This is the number three engine to Wright Patterson's displayed EC-121D Warning Star "Triple Nickel". The Warning Star was one of the first airborne early warning aircraft, derived from Lockheed's Super Constellation airliner. All EC-121's were powered by the 3,500 horsepower Curtiss-Wright R-3350-TC-18 "turbocompound engine", an 18 cylinder piston engine that featured three power recovery turbines to recover power from the exhaust to return to the drive-shaft via fluid coupling.
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"Triple Nickel" is the nickname of the EC-121 Warning Star I photographed today (That's her number three engine in the photograph). She got the nickname because her serial number is "53-555". Triple Nickel is famous because she's the first early warning aircraft to successfully guide a US pilot in for a kill over a North Vietnamese MiG. She was retired from service in the early 1970's and flown to Dayton where she's been safely stored ever since.
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