400 ^■ 800 mo Revs, per Min Fig. 41. mo 2000 240O 10 60 / - PropellerCFFiciency-Slip Curve •S50 ^ ^ \ t; 5 4030 \ / 5 / 9 / 5 2 0 2 5 3 0 3 S 4( 3 45 50 55 60 Slip (percentage^Fia. 42. … 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…
Airplanes
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