Leonardo da Vinci was an excellent painter, architect and inventor in the 15th-16th centuries who produced many studies and designs related to human flight, including early concepts of helicopters and hang gliders. While most of his flying machine designs were impractical, the hang glider design has been successfully reconstructed and flown. The first successful flights with humans aboard balloons and gliders helped progress the development of aviation in the 18th century. The Wright brothers' airplane, which incorporated a motor, achieved the first controlled, powered and sustained heavier-than-air human flight in 1903.