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 - 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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