One disadvantage of an engine-mounted fan on an engine that has isolators between it and the frame is that the fan tip clearance must be large enough to account for the engine movement. With electric fans the blade-to-shroud clearance can be held very tightly which increases the fan's efficiency.
Hydraulic fan drives are becoming more common on ag and construction equipment because they provide the variable-speed benefits of electric drives but with far greater power capacity. When you consider that a typical off-highway engine puts about 10% of its power into driving the cooling fan it becomes obvious why normal 12V electric drives aren't suitable for these applications.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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