In what year did Sir George Cayley build the first model glider?

Sir George Cayley is credited with constructing the first successful model glider in 1804. This achievement is significant as it laid the groundwork for future developments in aviation. Cayley's focus on separating the concepts of lift and drag and understanding the principles of aerodynamics was revolutionary at the time. His model glider demonstrated critical design elements that would later inform the creation of manned aircraft. This milestone indicates the beginning of serious scientific inquiry into flight mechanics, marking Cayley as a pioneer in the field of aeronautics. Understanding this context helps clarify the importance of the year 1804 in aviation history.