Aviation, theorico-pracitcal text-book for students (1919)
Carmina, Benjamin Morreale, 1871- [from old catalog] · New York, The Macmillan company · leaf 46
AVIATION 30 acted that of gravity; but when the motor is working, this opposing force is furnished by the thrust of the propeller, … Fig. 18 and when it is stopped, the necessary force is supplied by the pressure of the air against the center of resistance, which, being above that of the thrust and far in advance of the center of gravity, resists the nose-diving tendency of the aeroplane to such an extent as to make it assume…
Aeronautics
Internet Archive · The Library of Congress · Public domain (published before 1931). Free to use for anything.
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