Fig. 30. 62 THE AEROPLANE. R does not greatly deviate from the vertical, so that the thrustemployed, AE, is not much greater than the minimum thrustAD. If the angle DAB be equal to zero, the forward speed ofthe machine will be zero, so that equilibrium is only possiblewhen the propeller, which now… … FiQ. 31. Assuming the propeller thrust to act parallel to the longi-tudinal axis of the machine, it is seen easily from fig. 31 that (a) For a climb 6 is positive, and .-. H>D. (b) Horizontal flight 6 = 0, and .-. H=D. (c) For a fall 0 is negative, and .-. H<D. {d) For a glide H = 0 and .-.…
Airplanes
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