s reached at a slip of 24 per cent., and the slip mayvary from 18 per cent, to 32 per cent, without any appreciablevariation in the efficiency of the propeller. The followingsimple calculation shows how a small increase in the rotationalspeed of the propeller greatly increases the thrust of the… … 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.
Airplanes
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