Who was credited with developing the first practical helicopter?

Igor Sikorsky is credited with developing the first practical helicopter, which he achieved with the design and eventual flight of the VS-300 in 1939. Sikorsky's innovations included a single main rotor with a tail rotor, which became the standard configuration for helicopter design. His work laid the foundation for modern helicopter technology, demonstrating reliable flight capabilities and control.

This achievement came after years of research and experimentation in rotorcraft by various inventors. Sikorsky's helicopter was the first to successfully carry a human being, marking a significant milestone in aviation history. This combination of practical design and functionality distinguishes Sikorsky's work from other early helicopter concepts that were either impractical or did not possess the necessary flight capabilities.