Model 30, Ship 1, is prepared for a test flight. In June 1943, Ship 1 became the third helicopter to successfully fly untethered in the U.S. (Niagara Aviation Museum)
Model 30, Ship 1, is prepared for a test flight. In June 1943, Ship 1 became the third helicopter to successfully fly untethered in the U.S. (Niagara Aviation Museum)