hi im not too familiar with pprune yet and im not sure if this is the right forum but does anyone know why the SR71 didnt use a straight wing instead of an ogee wing like the concorde? if it could cruise above mach 3 then one would think the wing itself would be a more supersonic design rather than transonic. Straight wings reduce shock wave drag where as swept wings delay supersonic airflow which is useless in hypersonic cruise...