ᐅ All flight is based upon producing air pressure, all flight energy consists in overcoming air pressure. – Otto Lilienthal | QuotesTrue.com

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All flight is based upon producing air pressure, all flight energy consists in overcoming air pressure.

Otto Lilienthal

"Der Vogelflug als Grundlage der Fliegekunst". Book by Otto Lilienthal; English edition: Birdflight As The Basis of Aviation (1911), 1889.

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