In an axial flow pump, the rotor has an outer diameter of 75 cm and an inner diameter of 40 cm; it rotates at 500 rpm. At the mean blade radius, the inlet blade angle is 12 and the outlet blade angle is 15. Sketch the corresponding velocity diagrams at inlet and outlet, and estimate from them (1) the head the pump will generate, (2) the discharge or rate of flow in 1/s, (3) the shaft h.p. input required to drive the pump, and (4) the specific speed of the pump. Assume a manometric or hydraulic efficiency of 88% and a gross or overall efficiency of 81%.