Aircraft X-31 Stability Analysis and Validation with Experimental Data

Nicoleta Anton and Ruxandra M. Botez


aerodynamics, DATCOM, flight dynamics, root locus, stability derivatives, wind tunnel


The stability analysis of an aircraft configuration is studied using a new system stability method called the weight function method. This new method finds a number of weight functions that are equal to the number of first-order differential equations. This method is applied for longitudinal and lateral motions on a delta-wing aircraft, the X-31, designed to break the "stall barrier". Aerodynamic coefficients and stability derivatives obtained using the Digital DATCOM code have been validated with the experimental Low-Speed Wind tunnel data obtained using the German–Dutch Wind Tunnel (DNW–NWB). Root Locus Method is used to validate the method proposed in this paper.

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