NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
Comparison of calculated and measured helicopter rotor lateral flapping anglesCalculated and measured values of helicopter rotor flapping angles in forward flight are compared for a model rotor in a wind tunnel and an autogiro in gliding flight. The lateral flapping angles can be accurately predicted when a calculation of the nonuniform wake-induced velocity is used. At low advance ratios, it is also necessary to use a free wake geometry calculation. For the cases considered, the tip vortices in the rotor wake remain very close to the tip-path plane, so the calculated values of the flapping motion are sensitive to the fine details of the wake structure, specifically the viscous core radius of the tip vortices.
Document ID
19800024841
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Johnson, W. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
September 4, 2013
Publication Date
July 1, 1980
Subject Category
Aerodynamics
Report/Patent Number
A-8239
AVRADCOM-TR-80-A-11
NASA-TM-81213
Accession Number
80N33349
Funding Number(s)
PROJECT: RTOP 505-42-21
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Related Records

There are no records associated with this record.
No Preview Available