NACA-TN-605

Noise from propellers with symmetrical sections at zero blade angle

contributor author	NASA - National Aeronautics and Space Administration (NASA)
date accessioned	2017-09-04T16:28:30Z
date available	2017-09-04T16:28:30Z
date copyright	01/01/1937
date issued	1937
identifier other	UFYIYDAAAAAAAAAA.pdf
identifier uri	https://yse.yabesh.ir/std/handle/yse/91677
description abstract	A theory has been deduced for the "rotation noise" from a propeller with blades of symmetrical section about the chord line and set at zero blade angle. Owing to the limitation of the theory, the equations give without appreciable error only the sound pressure for cases where the wave lengths are large compared with the blade lengths. With the aid of experimental data obtained from a two-blade arrangement, an empirical relation was introduced that permitted calculation of higher harmonics. The generality of the final relation given is indicated by the fundamental and second harmonic of a four-blade arrangement.
language	English
title	NACA-TN-605	num
title	Noise from propellers with symmetrical sections at zero blade angle	en
type	standard
page	33
status	Active
tree	NASA - National Aeronautics and Space Administration (NASA):;1937
contenttype	fulltext