Correlation of Small-Scale and Full-Scale Wind Tunnel Data with Flight Test Data on the Lear Jet Model 23 700237

One of the basic questions arising from any small-scale wind tunnel test is the relationship of the low Reynolds number results to the high Reynolds number characteristics that will be encountered on the actual airplane.
This paper presents a direct comparison of longitudinal low-speed small-scale wind tunnel data, full-scale wind tunnel data, and flight test results. These data were obtained from tests on a 0.1 5 scale model of the Model 23 in the Wichita State University 7 X 10 ft wind tunnel, full-scale wind tunnel tests on a Model 23 in the NASA Ames 40 X 80 ft tunnel, and Lear Jet flight test results on Model 23 and Model 24 type airplanes. Since flight test data for the flaps down configuration are rather limited, most of the wind tunnel to flight comparisons are for the flaps up configuration.
The results indicate good agreement between wind tunnel and flight test results for the flaps up configuration. Comparison of small-scale data with full-scale flaps down wind tunnel data shows definite areas of disagreement for identical configurations.


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