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Sound from Dual-rotating and Multiple Single-rotating Propellers

Harvey H. Hubbard

Abstract

Report presenting sound measurements for static conditions in a range of tip Mach numbers for three different dual-rotating-propeller configurations and one combination of two single-rotating propellers operating side by side in the same plane of rotation. The results obtained are compared with a theoretical analysis of the problem and excellent agreement is found.

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Available abstract

Key concepts: Propeller, Mach number, Rotation (mathematics), Dual (grammatical number), Acoustics, Plane (geometry), Range (aeronautics), Mechanics