AERODYNAMIC PRINCIPLES AND DESIGNES FUNDAMENTAL TO MODERN AIRCRAFT.

glider left the surface of the earth and soared in a stable, con-trolled flight. At the controls was John Joseph Montgomery, aged 25, who had designed and built the fragile craft. After the launching, John and his brother James, who had helped launch the glider, paced off the distance of the flight as 600 feet. In ad-dition to James, several local ranchers and others in John’s fam-ily witnessed the construction and flight of the 1883 glider. This 1883 flight of Montgomery’s glider was the first manned, controlled flight of a heavier-than-air machine in history. It pre-ceded by some 10 years the famous glider flights of Otto Lilienthal, and by 20 years the historic powered flights of the Wright brothers. Since the beginning of recorded history, humankind has dreamed of flying. Most early experimenters focused on mimic-king the flight of birds. Birds, however, fly by combining lift