Transcription of Propeller Efficiency - NAR Associates
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Propeller Efficiency - NAR Associates
Propeller EfficiencyRule of ThumbDavid F. Rogers, PhD, ATPT heoretically the most efficient Propeller is a large diameter, slowly turning single bladepropeller. Here, think the Osprey or helicopters. In both cases, large diameter, slowly turn-ing, compared to typical fixed wing aircraft, propellers are used. Generally, single bladedpropellers are not used because of dynamic imbalance - think vibration. As a result, thegeneral wisdom is that better Propeller efficiency results from decreasing RPM. However, Propeller efficiency is not only a function of RPM. It is also a function of Propeller diam-eter and true airspeed. Generally these parameters are combined into a nondimensionalparameter called the advance ratio (J=V/ND), whereVis the true airspeed in feet persecond,Nis the Propeller rotational speed in revolutions per second andDis the propellerdiameter in feet.
Propeller Efficiency – Cruise Rule of Thumb 3 Outside of these values the propeller efficiency decreases. From this, we can see that, for a fixed diameter propeller, it is the ratio of the true airspeed to the propeller RPM that is
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