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A major problem with the autogyro was driving the rotor before takeoff.
en.wikipedia.org By using both helium and helicopter rotors, the aircraft can avoid having to jettison helium after unloading.
en.wikipedia.org This variant had upgraded engines, longer life rotor, and higher take-off weight.
en.wikipedia.org The design required closer tolerances between the rotors and the housing, resulting in fewer air back-flow losses.
en.wikipedia.org As it prepared to land, the main rotor was struck by enemy gunfire.
en.wikipedia.org