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I always liked the idea of getting some energy out of anything that costs you energy. I guess it comes from the old vacuum operated wipers. Not that they were that good but they used some of the energy lost in a throttle restriction.
I think of it as a column of air extending into outer space that is trying to crush everything on the planet. It's astounding how much total pressure is exerted on our skin surface at 14.7 pounds per square inch.
regards
Mech
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