a positive displacement pump will do as you say. An impeller based pump changes efficiency under restriction and the load is reduced. A perfect example is a vacuum cleaner. Running with a clean filter/bag, and an open clean hose, the sound it makes is a medium deep whine. If you cap off the intake (or exhaust) the sound increases in pitch (because they are universal motors (brushes not synchronous) the motor speeds up because the load goes down. The fins on the turbine just spin the same air over and over with much less work being done. It seems wrong, but isn't. Jim
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Today's Featured Article - Show Coverage: Godfrey, Illinois Country Days - by Cindy Ladage. Except for last fourth of July's Old Gold show in Springfield, Illinois, I don't remember when it was so hot. Nevertheless, the heat didn't keep vendors and visitors alike from enjoying the third annual Country Day's Event. Jane Elliott said the event was originally a one man show. "Barry Seiler, owner of Country Town Farm Supply store used to invite people up to the Johne Deere store. He would give hats and a free meal for everyone that brings a tractor." Elliott said while this
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