Investigation of the NACA 4-(3)(8)-045 two-blade propellers at forward Mach numbers to 0.725 to determine the effects of compressibility and solidity on performance

Stack, John Draley, Eugene C Delano, James B Feldman, Lewis

As part of a general investigation of propellers at high forward speeds, tests of two 2-blade propellers having the NACA 4-(3)(8)-03 and NACA 4-(3)(8)-45 blade designs have been made in the Langley 8-foot high-speed tunnel through a range of blade angle from 20 degrees to 60 degrees for forward Mach numbers from 0.165 to 0.725 to establish in detail the changes in propeller characteristics due to compressibility effects. These propellers differed primarily only in blade solidity, one propeller having 50 percent and more solidity than the other.

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