Extraction of longitudinal aerodynamic coefficients from forward-flight conditions of a tilt wing V/STOL airplane / by James L. Williams.

Format:

Book

Government document

Author/Creator:

Williams, James L., author.

Contributor:

United States. National Aeronautics and Space Administration, issuing body.

Langley Research Center

Series:

NASA technical note ; D-7114.

NASA/TN ; D-7114

Language:

English

Subjects (All):

Airplanes--Performance--Statistics.

Airplanes.

Stability of airplanes, Longitudinal.

Parameter estimation.

Mathematical statistics.

Airplanes--Performance.

Convertiplanes.

Genre:

Statistics

Statistics.

Physical Description:

1 online resource (24 pages) : illustrations.

Place of Publication:

Washington, D.C. : National Aeronautics and Space Administration, December 1972.

Summary:

A parameter-estimation algorithm was used to extract the longitudinal aerodynamic derivatives from flight data for the XC-142A airplane in a cruise condition. The flight data were the response to a tail-plane doublet input. Results of this study showed that a set of derivatives were determined which yielded a calculated aircraft response in close agreement with the measured response. This calculated response was in much closer agreement with the flight data than the response obtained by using derivatives which were calculated from empirical methods. There were large differences between some of the important derivatives extracted from flight data and those calculated from empirical methods. The reasons for these differences were not identified.

Notes:

"December 1972."

Includes bibliographical references (page 11).

Description based on online resource, PDF version; title from title page (NASA, viewed on July 1, 2021).

Other Format:

Online version: Williams, James L. Extraction of longitudinal aerodynamic coefficients from forward-flight conditions of a tilt wing V/STOL airplane

OCLC:

23658755