[Greg687]

Just to add: cavitation is caused by the fluid undergoing excessive drop in pressure, converting to vapor, and then collapsing back into fluid again. If you try to "overpump" a fire engine pump, or a boat propeller, the water will do this...sounds like marbles! Also, not good. The next thing you are doing is considering the words after "Dear, Chief. No one was more surprised than I, when...: