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Re: Liquid Ballast vs. Iron Weights
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Posted by Ron on July 29, 2004 at 09:37:26 from (69.179.21.81):
In Reply to: Re: Liquid Ballast vs. Iron Weights posted by Benjb in NE on July 29, 2004 at 09:10:18:
Water inside a tire tube does not move around the axis of rotation. Get a child's clear yard ball. Fill 3/4 with water. Spin it on one axis slowly in your hands and you will see for yourself. The reason is simple, not enough friction exists between the tube and water to move the water. At high speeds, centrifugal force will cause the water to pile up against tube surface, causing friction and then the water will move, but due to surface tension and shear only some of it moves. Given that tractor tires operate at only a few rpm in real world conditions, there is near zero additional power required to operate the tractor with water in the tires, beyond the dead weight of the water which really only has an effect during acceleration and deceleration, again something tractors in the real world do very little of.
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