NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
A Survey of Theoretical and Experimental Coaxial Rotor Aerodynamic ResearchThe recent appearance of the Kamov Ka-50 helicopter and the application of coaxial rotors to unmanned aerial vehicles have renewed international interest in the coaxial rotor configuration. This report addresses the aerodynamic issues peculiar to coaxial rotors by surveying American, Russian, Japanese, British, and German research. (Herein, 'coaxial rotors' refers to helicopter, not propeller, rotors. The intermeshing rotor system was not investigated.) Issues addressed are separation distance, load sharing between rotors, wake structure, solidity effects, swirl recovery, and the effects of having no tail rotor. A general summary of the coaxial rotor configuration explores the configuration's advantages and applications.
Document ID
19970015550
Document Type
Technical Publication (TP)
Authors
Coleman, Colin P. (NASA Ames Research Center Moffett Field, CA United States)
Date Acquired
September 6, 2013
Publication Date
March 1, 1997
Subject Category
Aerodynamics
Report/Patent Number
NASA-TP-3675
A-975555
NAS 1.60:3675
Funding Number(s)
PROJECT: RTOP 522-31-12
PROJECT: RTOP 522-41-22
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Available Downloads

NameType 19970015550.pdf STI