Helicopter Motorcycle In Flight -- The Air Forces' New Helicopter motorcycle, powered by ram jet units to spin the rotor blades, makes a test flight at the St. Louis, Mo., plant of the McDonnel Aircraft corporation. The craft eights only 310 pounds but has lifted an additional load of 300 pounds and moved at a speed of 50 miles an hour. November 15, 1947. (Photo by Associated Press Photo).
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