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The sailing flight of birds is the only form of flight which is carried on for some length of time without the expenditure of power.

— Otto Lilienthal The Romance of Aeronautics (1912)

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More quotes by Otto Lilienthal

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

Der Vogelflug als Grundlage der Fliegekunst (1889)

Actual practice in individual flight presents the best prospects for developing our capacity until it leads to perfected free flight.

The Romance of Aeronautics (1912)

Gradual development of flight should begin with the simplest apparatus and movements, and without time complication of dynamic means.

The Romance of Aeronautics (1912)

The supporting powers of time air and of the wind depend on the shape of the surfaces used, and the best forms can only be evolved by free flight through the air.

The Romance of Aeronautics (1912)

Numerous technicians in every state are doing their utmost to achieve the dream of free, unlimited flight and it is precisely here where changes can be made which would have a radical effect on our whole way of life.

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Quote text and notes from Wikiquote: Otto Lilienthal (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.