Abstract
In hypersonic low-density flows, slender vehicle dynamics are affected by various viscous flow phenomena. The true viscid-inviscid interaction is often difficult to extract from the background of support interference in wind tunnel tests and nonlinear six-degree-of-freedom motion effects in ballistic range tests, as was demonstrated by Welsh, Winchenbach, and Madagan several years ago. The range data and wind tunnel results for a 10-deg cone were shown to give completely different M^ trends for the pitch damping derivative. The aim of the present paper is to resolve this ambiguity and to help the vehicle designer decide how to obtain the best possible information about the full-scale vehicle dynamics using subscale dynamic test data.
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