Experimental investigations of the effects of jets and exhaust on a model of the TTV Mk 40 X-1 are discussed. Photographs of the model jet and exhaust flow patterns are presented. Model pressure distributionuddata and afterbody drag coefficients are shown for numerous flow conditions. Many correlations among the observed phenomena are discussed. Several estimates of prototype jet- and exhaust-induced drag forces areudpresented. The susceptibility of the configuration to cavitation is discussed. Detailed analyses of the model results as they pertain to the prototype external flow phenomena are presented. Possible fields ofudstudy are suggested which could lead to improved prototype performance characteristics.
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