Take the vacuum cleaner out of the closet, turn it on (with a clean bag) it will make a moderate pitch sound. Put your hand over the inlet hose, and the motor will wind up several hundred RPM. (though this is a universal motor, and not induction, the principle of the non-positive displacement pump provides solid evidence. When pulling against a plugged hose, the impeller turbine is in a partial vacuum. EX 450 Owner is spot on and a good writer. Jim
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Today's Featured Article - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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