Which aircraft design was a major innovation attributed to Igor Sikorsky?

Igor Sikorsky is best known for his pioneering contributions to helicopter design, making the helicopter a significant innovation attributed to him. He developed the first successful practical helicopter in the early 1930s, which was the Vought-Sikorsky VS-300. This design introduced features such as a single main rotor and a tail rotor for counterbalancing torque, establishing a foundation for future helicopter engineering. His work allowed for vertical flight and opened new possibilities for aviation, search and rescue operations, and military applications. Sikorsky’s advances in rotorcraft significantly transformed aviation, demonstrating a unique approach compared to conventional fixed-wing aircraft designs or other forms like gliders and commercial jets.