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Hiller OH-23 Raven
The Hiller OH-23 Raven was a three-place, light observation helicopter based on the Hiller Model 360. The Model 360 was designated by the company as the UH-12 ("UH" for United Helicopters),〔Donald, David. ''The Complete Encyclopedia of World Aircraft''. New York: Barnes & Noble Books, 1998.〕 which was first flown in 1948. The OH-23 trainer was jokingly nicknamed the "Hiller Killer" by US Army Aviation student pilots who had to fly it.〔(Fort Wolters Tour: The Aircraft )〕
==Development==
In 1947, United Helicopters developed the prototype Model 360X helicopter. A year later, on 14 October 1948 the CAA issued a production certificate for the Model 360. United Helicopters began producing the Model 360 as the UH-12. In 1949, the UH-12 became the first helicopter to make a transcontinental flight from California to New York. When Hiller upgraded the engine and the rotor blades, the company designated the new model as the UH-12A. It was the UH-12A that would be adopted by both the French and United States militaries, as well as being used by civil commercial operators in several countries.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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