Lilienthal 's greatest contribution was the development of heavier-than-air flight. He madeover 2000 glides experimenting with various forms of winged craft. His glides were from an artificial hill he built near Berlin, and also from natural hills, especially in the Rhinow region. Lilienthal succeeded in making sustained flights of upto 700 to 800 feet from hilltops. He was the first to make use of cambered wings and virtually the first to use wings with positive results.
Stamp issued by Germany in 1934 with his picture and his gliding attempt in the background..
A stamp issued by Germany in 1978.
Hungarian stamp showing Otto Lilienthal in the background