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With Igor Sikorsky at the controls, the VS-300 hovers during an early public demonstration flight

With Igor Sikorsky at the controls, the VS-300 hovers during an early public demonstration flight. First flown in September 1939, the VS-300 brought the world record for helicopter endurance to the United States in 1941 when it stayed aloft for one hour thirty-two minutes. All Sikorsky production helicopters have been refined versions of this first successful single main rotor, torque-compensating tail rotor configuration.

Credits - Hiller Aviation Museum