What did howard discover and when?

Howard Hughes, an American aviation pioneer and film director, is known for several significant contributions, particularly in the aviation industry. He made notable advancements in aircraft design and technology during the 1920s and 1930s, including the creation of the H-1 Racer and the Spruce Goose. His innovations helped improve flight speed, safety, and efficiency, significantly influencing both commercial and military aviation. Hughes's work laid the foundation for future developments in aerospace engineering.