Which individual is known for his innovations in helicopter design?

Igor Sikorsky is widely recognized for his groundbreaking contributions to helicopter design. He is often referred to as the "father of the modern helicopter" due to his pivotal role in developing the first successful helicopter designs. Sikorsky's work led to the creation of the VS-300 in 1939, which was the first practical helicopter to incorporate the single main rotor and tail rotor configuration, a design that is still used in many helicopters today. His innovations significantly advanced the technology behind vertical flight and set the foundation for future helicopter developments, making him a key figure in aerospace history.

In contrast, Charles Lindbergh is known primarily for his achievements in fixed-wing aviation, particularly for his solo transatlantic flight. Wilbur Wright, alongside his brother Orville, focused on developing the first powered aircraft, paving the way for modern aviation. Harry F. Guggenheim was an influential aviation promoter and philanthropist but did not make direct contributions to helicopter design like Sikorsky did.