NACA-TN-3422

Noise survey of a 10-foot four-blade turbine-driven propeller under static conditions

contributor author	NASA - National Aeronautics and Space Administration (NASA)
date accessioned	2017-09-04T15:55:55Z
date available	2017-09-04T15:55:55Z
date copyright	01/01/1955
date issued	1955
identifier other	QWONEEAAAAAAAAAA.pdf
identifier uri	https://yse.yabesh.ir/std/handle/yse/59307
description abstract	Overall sound-level measurements and frequency analyses of tape recordings of the noise emitted from a 10-foot-diameter, four-blade propeller mounted on a turbine-powered vehicle have been made under static conditions at stations equally spaced on a 75-foot-radius circle. The overall propeller-noise pattern was unsymmetrical about the fuselage center line, the maximum sound-pressure level being located in the right rear quadrant. The frequency analysis shows that this unsymmetrical distribution consists primarily of the two lowest propeller harmonics. In the plane of and ahead of the propeller, harmonics as high as the eleventh are important.
language	English
title	NACA-TN-3422	num
title	Noise survey of a 10-foot four-blade turbine-driven propeller under static conditions	en
type	standard
page	26
status	Active
tree	NASA - National Aeronautics and Space Administration (NASA):;1955
contenttype	fulltext