The Mechanics of the Aeroplane, a Study of the Principles of Flight
The Mechanics of the Aeroplane, a Study of the Principles of Flight
Emile Auguste Duchne
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15. If this curve is completed by the insertion, at various points, of the corresponding values of the angle of in- cidence, it will contain in a single graph all the data relating to the variation of the useful power required to sustain a given aeroplane. This graph may be termed the characteristic curve, and constitutes the first of the two curves referred to in 25. 27. Normal speed. One particular point in this curve is of special interest ; this is the point L, which corresponds to the crit...ical speed mentioned in 25, that cannot be exceeded without danger. Obviously, it would be advantageous to fly at this speed, provided the motor is sufficiently powerful ; in which case the critical speed becomes the normal speed. On the other hand, if the propeller is incapable of developing the useful power required for sustentation even though the motor be running at full power the normal flight of the aeroplane takes place at a lower speed. As a general rule, however, the motor should at full power be powerful enough to enable the critical HORIZONTAL FLIGHT IN STILL AIR 53 speed to be attained; and it may be further pointed out (see 25) that the pilot should have a reserve of power enabling him to exceed the critical speed.
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