What did Otto Lilienthal do repeatedly and successfully with gliders?
Flights
Acrobatic stunts
Engine modifications
Long distance traveling
Answer
Otto Lilienthal did repeatedly and successfully fly gliders. He was a pioneer of aviation and the first person to make successful, repeated flights in a glider. He made over 2,000 flights in his gliders, and his work helped to pave the way for the development of powered flight.
Flight of the Eagle: Testing Your Knowledge on Otto Lilienthal, the German Aviation Pioneer