NACA-TN-1338

Abstract

The selection of a propeller on the basis of efficiency for application to a light-airplane design can be accomplished by the use of the charts presented. The required calculations are made a minimum by presenting the dimensional propeller parameters directly on the charts. Values of power of 50, 100, 150, 225, and 300 horsepower are covered for airspeeds of 50, 100, 150, and 200 miles per hour, propeller diameters of 6, 8, and 10 feet, and blade numbers of two, four, six, and eight over a wide range of propeller rotational speed. <br>The application of the results to design problems is demonstrated by three examples; (1) the investigation of the efficiency of a wide variety of propellers for a given design condition, (2) the investigation of the efficiency of a controllable-pitch constant-speed propeller as a function of airspeed, and (3) the investigation of the efficiency of a fixed-pitch propeller as a function of airspeed and engine operation.