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 - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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