 pressur measur sharp blunt 5 15 half-angl cone mach number 3 86 angl attack 100 pressur measur sharp blunt 5 15 half-angl cone mach number 3 86 angl attack 100 measur pressur distribut cone compar modifi newtonian theori deviat larg 14 percent stagnat pressur normal shock combin empir cylind normal flow newtonian concept method calcul pressur cone high angl attack develop calcul method differ experiment sharp cone 2 percent stagnat pressur normal shock blunt cone addit deviat 8 percent nose schlieren pictur flow attach shock sharp attack detach shock appear associ attain sonic speed shock orific size increas indic pressur true orific width greater on-tenth local radiu curvatur 