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Correaltion of full-scale drag predictions with flight measurements on the C-141A aircraft. Phase 2: Wind tunnel test, analysis, and prediction techniques. Volume 1: Drag predictions, wind tunnel data analysis and correlationThe degree of cruise drag correlation on the C-141A aircraft is determined between predictions based on wind tunnel test data, and flight test results. An analysis of wind tunnel tests on a 0.0275 scale model at Reynolds number up to 3.05 x 1 million/MAC is reported. Model support interference corrections are evaluated through a series of tests, and fully corrected model data are analyzed to provide details on model component interference factors. It is shown that predicted minimum profile drag for the complete configuration agrees within 0.75% of flight test data, using a wind tunnel extrapolation method based on flat plate skin friction and component shape factors. An alternative method of extrapolation, based on computed profile drag from a subsonic viscous theory, results in a prediction four percent lower than flight test data.
Document ID
19740010566
Document Type
Contractor Report (CR)
Authors
Macwilkinson, D. G. (Lockheed-Georgia Co. Marietta, GA, United States)
Blackerby, W. T. (Lockheed-Georgia Co. Marietta, GA, United States)
Paterson, J. H. (Lockheed-Georgia Co. Marietta, GA, United States)
Date Acquired
September 3, 2013
Publication Date
February 1, 1974
Subject Category
AIRCRAFT
Report/Patent Number
LG73ER0058-VOL-1
NASA-CR-2333
Funding Number(s)
CONTRACT_GRANT: NAS1-10045
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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