Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Bell R-12 (Model 48) was an American 1940s military utility helicopter built by Bell Helicopter company.During 1946 Bell Helicopter began development of a new helicopter, much larger, that Model 47. It was partly basing upon its construction, first of all, a rotor system, and was basically a scaled-up version of Model 47. The basic variant was civilian Model 42, but the United States Air Force got interested in the design and ordered development of its military variant, Model 48. Two prototypes were ordered as the XR-12. It was powered by a 540 hp Pratt

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