What is the sound of one piston slapping?
What is the sound of one piston slapping?
Illustration for article titled Pratt  Whitneys 747SP Flying Testbed

P&W uses a Boeing 747SP that was originally delivered to Korean Airlines (reg HL7457) on January 30, 1980. It flew with the airline until it was placed into storage in 1998. Then in 2008, P&W purchased the 747SP to use for engine testing. (SeattlePI.com)

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Photo by Patrick Cardinal via Airliners.net

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