 experiment investig base pressur blunt-trail-edg wing superson veloc experiment investig base pressur blunt-trail-edg wing superson veloc measur base pressur present 29 blunt-trail-edg wing aspect ratio 3 0 airfoil profil profil compris thick ratio 0 05 0 10 boattail angl --2 9 20 ratio trail-edg thick airfoil thick 0 2 1 0 test conduct mach number 1 25 1 5 2 0 3 1 mach number reynold number angl attack vari lowest reynold number investig 0 2 10 highest 3 5 10 measur wing separ turbul flow laminar flow boundari layer span-wise survei base pressur conduct wing turbul boundari-layer flow small effect base pressur variat reynold number airfoil profil shape boattail angl angl attack princip variabl base pressur turbul flow mach number highest mach number investig 3 1 ratio boundari-layer thick trail-edg thick base pressur laminar boundari-layer flow trail edg reynold number base pressur larg except case effect base pressur variat angl attack profil shape upstream base appreci larg princip variabl base pressur laminar flow ratio boundari-layer thick trail-edg thick except case involv laminar flow trail edg effect base pressur variat profil shape boattail angl angl attack unusu larg case variat base pressur angl attack discontinu exhibit hysteresi stroboscop schlieren observ mach number 1 5 indic special phenomena associ vortex trail high frequenc 