This paper includes a minimum of the data taken. Evaluation of all data resulted in the conclusion that optimum tunnel settings were a stagnation level of 25 psia, flaps closed to minimum open area and test section walls parallel. A comparison of the centerline longitudinal Mach number distribution for metal and plastic sidewalls is shown in Figure 8. Two aerodynamic test sections were defined the standard' test section (tunnel Stations 18 to 27) and the 'long' test section (tunnel Stations 16 to 32).
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