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A longitudinal aerodynamic data repeatability study for a commercial transport model test in the National Transonic FacilityA high Reynolds number investigation of a commercial transport model was conducted in the National Transonic Facility (NTF) at Langley Research Center. This investigation was part of a cooperative effort to test a 0.03-scale model of a Boeing 767 airplane in the NTF over a Mach number range of 0.70 to 0.86 and a Reynolds number range of 2.38 to 40.0 x 10(exp 6) based on the mean aerodynamic chord. One of several specific objectives of the current investigation was to evaluate the level of data repeatability attainable in the NTF. Data repeatability studies were performed at a Mach number of 0.80 with Reynolds numbers of 2.38, 4.45, and 40.0 x 10(exp 6) and also at a Mach number of 0.70 with a Reynolds number of 40.0 x 10(exp 6). Many test procedures and data corrections are addressed in this report, but the data presented do not include corrections for wall interference, model support interference, or model aeroelastic effects. Application of corrections for these three effects would not affect the results of this study because the corrections are systematic in nature and are more appropriately classified as sources of bias error. The repeatability of the longitudinal stability-axis force and moment data has been accessed. Coefficients of lift, drag, and pitching moment are shown to repeat well within the pretest goals of plus or minus 0.005, plus or minus 0.0001, and plus or minus 0.001, respectively, at a 95-percent confidence level over both short- and near-term periods.
Document ID
19960002985
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Wahls, R. A. (NASA Langley Research Center Hampton, VA, United States)
Adcock, J. B. (NASA Langley Research Center Hampton, VA, United States)
Witkowski, D. P. (Boeing Commercial Airplane Co. Seattle, WA., United States)
Wright, F. L. (Boeing Commercial Airplane Co. Seattle, WA., United States)
Date Acquired
September 6, 2013
Publication Date
August 1, 1995
Subject Category
Aerodynamics
Report/Patent Number
L-17412
NASA-TP-3522
NAS 1.60:3522
Accession Number
96N12994
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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