The last of the big radial powerplants from Pratt & Whitney long past was the huge P&W 4360,28cyl,turbosupercharged,water injection air cooled 3500HP hi tech engine. This baby was awsome to see & hear run,while turning a 16ft 6in Hamilton Standard,full reversing,feathering propellor. The Berlin Airlift Historical Foundation from Toms River NJ. has one of the last remaining examples of the big prop era still in operation today. 4 of these big P&W 4360's turn in unison and is quite a site to behold. This group ownes & operates one of the last existing boeing C-97 STRATOCRUISERs in the WORLD today. When complete SHE will become a Flying Museum of COLD WAR HISTORY.See us at www.spiritoffreedom.org "The Legacy Lives On"