Abstract
Experimentally obtained normal-force curve slope and center of pressure location at small angles of attack of strake units were correlated. For delta strakes the correlation shows good agreement with predictions based on slender body theory. For trapezoidal and rectangular strakes, the actual normal force curve slope is larger than predicted by this theory. The correlation parameters are used to improve the Sigal and Blake unified crossflow method for the estimation of the longitudinal aerodynamic characteristics of configurations that feature strakes. Four body-strake configurations were analyzed using engineering level methods: the 2007 version of the Missile Datcom code, White’s empirical method, and the present method. All the methods yield good agreement between predications and test data for most cases. The present method needs some adjustment of the crossflow drag coefficient model for transonic crossflow Mach numbers.
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