Accession Number:

AD0753397

Title:

An Investigation of Noise Generation on a Hovering Rotor, Part 2

Descriptive Note:

Final rept. 1 Feb 1971-31 Jul 1972

Corporate Author:

BOEING VERTOL CO PHILADELPHIA PA

Personal Author(s):

• Sternfeld, H.
• Bobo, C.
• Carmichael, D.
• Fukushima, T.
• Spencer, R.

Report Date:

1972-11-01

Pagination or Media Count:

108.0

Abstract:

The study is a natural extension of the program to investigate noise generation on a hovering rotor reported in an previous investigation. That program acquired data on a large 60 ft. diameter rotor operating on a whirl tower, and evaluated that data in the light of established analytical procedures. The work described in this report compares available data in order to investigate the effects of variations in rotor design. This data, which was available from other test programs included variations in number of blades of similar airfoil, airfoil, and platform. Also included is an evaluation of model testing by comparison of the results of the full size helicopter rotor with a one-eleventh scale model.

Descriptors:

• *HELICOPTER ROTORS
• *PROPELLER NOISE
• ROTARY WINGS
• TEST METHODS
• AIRCRAFT MODELS
• AIRCRAFT NOISE
• HOVERING
• HELICOPTERS
• VORTICES

Subject Categories:

• Helicopters
• Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE