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

Otto Lilienthal
Air, Overcoming, Energy
"Der Vogelflug als Grundlage der Fliegekunst". Book by Otto Lilienthal; English edition: Birdflight As The Basis of Aviation (1911), 1889.
All flight is based upon producing air pressure, all flight energy consists in overcoming air pressure.