What configuration characterized Lilienthal's first recognized series of successful flights starting around 1891?
Answer
Monoplane
The initial successful craft that began Lilienthal's famous series of flights around 1891 featured a monoplane design, meaning it utilized a single set of wings.

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World's First Aircraft - Lilienthal's Glider Flight - YouTube
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Who is credited with systematically designing, building, and repeatedly flying heavier-than-air craft that informed future aviators?In which city and country was Otto Lilienthal's significant aviation work and the construction of his early successful models centered?What was the primary method Lilienthal used to control his early gliders?What configuration characterized Lilienthal's first recognized series of successful flights starting around 1891?Around what approximate year did Otto Lilienthal transition from monoplane designs to biplane configurations?What publication by Lilienthal, released in 1889, laid out the theoretical foundation for his subsequent practical glider experiments?What was the approximate scale of Lilienthal's documented flight activity by the time of his fatal accident in 1896?What specific problem did Lilienthal solve with an artificial structure near Berlin to facilitate repeatable testing?What common materials were used to construct the frame and wing surface of Lilienthal's early, historically significant gliders?How was Lilienthal's approach to pilot control fundamentally different from the systems later developed by the Wright brothers?