What publication by Lilienthal, released in 1889, laid out the theoretical foundation for his subsequent practical glider experiments?
Answer
Birdflight as the Basis of Aviation
Lilienthal published his findings outlining the theoretical basis derived from studying bird flight in his 1889 book titled *Birdflight as the Basis of Aviation* (*Der Vogelflug als Grundlage der Fliegkunst*).
#Videos
World's First Aircraft - Lilienthal's Glider Flight - YouTube
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