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DEVELOPMENT OF A TRAVERSING RAKE SYSTEM FOR MEASURING IN-FLIGHT THRUST OF A TURBO-JET POWERED AIRCRAFT. PHASE III. FLIGHT DEVELOPMENT AND EVALUATION
GRUMMAN AIRCRAFT ENGINEERING CORP BETHPAGE N Y
The installation and reliability of the traversing rake system on the test aircraft was demonstrated. Gross thrust determined for complete traverse cycles under stabilized flight conditions always repeated within 3. The corresponding values of mass flow and net thrust always repeated within 4 a d 3 12 respectively. The correlation of the traversing rake with subsonic airplane measured performance and wind tunnel drag showed that performance of the tes aircraft could be accounted for within 2 to -6 of the wind tunnel drag. The difference in supersonic drag varied from 35 counts, or 7, at MT equals 1.03 to 5 counts, or 1, at MT equals 1.07. The traversing rake flight test results showed that propulsive net thrust calculated using commonly accepted in-flight thrust calculation procedures only partially accounted for the differences between the actual measured airplane performance and that predicted by wind tunnel and engine test cell results. Author