Could somebody explain this to me please?
Just a guess but perhaps the drag rise is due to detached shock wave as the object becomes more blunted ....no good theory exists on those complication so the empirical data posted has to be relied upon, the delta plan-form clearly has more to do with offsetting first order compressibility effects than with drag reduction... but the overall L/D ratio and more importantly the lift slope curve may be more favorable, with a specific plan form; drag/Mach data alone is insufficient to conclude anything about the relative efficiencies of the plan forms
Yeah but at Mach 5, and Mach 6 how far back is the mach cone swept? What if the airframe is not entirely inside the cone?
it all then becomes very empirical as the theoretical treatment makes that assumption...
