Drag Coefficients of Low Altitude Stationary Flight Test Airship Estimated from Flight Tests

Abstract

Flight tests were carried out to obtain aerodynamic characteristics of the low altitude stationary flight test airship. The deceleration test method was used in a flight experiment to obtain the drag coefficient. Combining with the deceleration test result, the minimum drag coefficient was acquired by equating a thrust force with the corresponding drag force at the steady level flight. As a result, 0.044±0.002 were obtained on the minimum drag coefficient of the airship. Modifications of the deceleration test data analysis are proposed to be applicable to test data obtained under non-zero attack angle etc. in the paper.