 pressur distribut axial symmetr bodi obliqu flow pressur distribut axial symmetr bodi obliqu flow simpl pictur work lotz flow forward bodi revolut obliqu flow deriv entir elementari consider pressur point forward bodi angl incid depend three paramet valu vari bodi variat paramet bodi determin small number wind tunnel water tunnel measur water tunnel measur axial symmetr head shape addit measur illustr theoret conclus data head shape adequ determin pressur coeffici point head shape angl incid 6 determin peak suction angl incid condit onset cavit head 