20 25 30 35Slip fPercentaga) Fis. 43. 94 THE AEROPLANE. we shall assume that to drive an aeroplane at 50 miles per hour,our propeller must have a thrust of 237 lbs. and a rotationalspeed of 970 revolutions per minute. Hence slip of the propeller= 44 per cent. A glance at the curves shows that when… … Fig. 44. per minute, so that the slip is now 45 per cent., we enable thepropeller to give the required thrust of 237 lbs.; and, further,the efficiency remains practically unaltered,. In other words,reasonable discrepancies between designed and calculated valuesare not of great importance, as a…
Airplanes
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