The second of the Wright Brothers' series of gliders was made in 1901 and was an enlarged version of their 1900 glider, with its design based heavily on the research notes of early aeronautical pioneer Otto Lilienthal.
Test flown in the summer of 1902, the third glider built by the Wright Brothers is widely acknowledged by aviation historians to be the world's first practical aircraft. Based on wind tunnel tests the Wrights had performed after the flights of their 1901 glider, improvements incorporated into the design of the 1902 glider included, most significantly, a simple vertical control surface – a rudder.
Arguably the most successful rocket engine ever built, the RL10 has been used for over 50 years and has launched numerous military, government and commercial satellites into space.
Though neither swift in speed nor elegant in appearance, the Aeronca C-3 produced a mass of devoted owners who loved their ungainly appearance and the sheer pleasure they offered at low expense. Designed for simple, low-cost fair weather flying fun, the C-3's walrus-like appearance generated such nicknames as Flying Bathtub and Airknocker.
The Albatros fighter series consisting of D. I through D. Va models were the primary German fighter aircraft of World War I. The D. I model was introduced in September 1916, just as the first German fighter squadrons were being formed.