Perpendicular blade vortex interaction and its implications for helicopter noise prediction
Subtitle: final report to NASA Langley on research performed under grant NAG-1-1119, "wave-number frequency spectra in a trailing vortex for BSI noise prediction" for the period ending 15th August, 1993
By: William J. Devenport ... [et al.].
Contributors: Devenport, William J.; United States. National Aeronautics and Space Administration.
Series: [NASA contractor report] -- NASA CR-193623.
Publisher: National Aeronautics and Space Administration; National Technical Information Service, distributor
Published: 1993
Place of publication: [Washington, DC; Springfield, Va
Language: eng
Format: Microform
Subjects: Vortex-motion.; Rotors (Helicopters); Aerodynamic noise.
Other titles: Wave-number frequency spectra in a trailing vortex for BSI noise prediction.
Notes: Distributed to depository libraries in microfiche.

Shipping list no.: 93-1201-M.

Microfiche. [Washington, D.C. : National Aeronautics and Space Administration, 1993] 4 microfiches.