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To invent an airplane is nothing. To build one is something. But to fly is everything.
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The maintenance of equilibrium in forward flight is a matter of practice, and can only be learned by repeated personal experiment.
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Experience alone can teach us the best forms of construction for sailing apparatus in order that they may be of sufficient strength, very light, and most easily managed.
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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.
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The difficulty of rising into the air increases rapidly with the size of the apparatus. The uplifting of a single person, therefore, is more easily attained than that of a large flying machine loaded with several persons.
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The increasing size of the apparatus makes the construction more difficult in securing lightness in the machine; therefore the building of small apparatus is to be recommended.
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Actual practice in individual flight presents the best prospects for developing our capacity until it leads to perfected free flight.
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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.
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By practice and experience a man can (if the wind be of the right strength) imitate the complete sailing flight of birds by availing himself of the slight upward trend of some winds, by performing circling sweeps, and by allowing the air to carry him.
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Gradual development of flight should begin with the simplest apparatus and movements, and without time complication of dynamic means.
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The contrivances which are necessary to counteract the wind effects can only be understood by actual practice in the wind.
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All flight is based upon producing air pressure, all flight energy consists in overcoming air pressure.