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Originally posted by grvydude18
the impingment effect? what is that? i guess if someone can answer that im done with questions on this topic  but yeah, i understand the jetting in the hole now, it makes a lot of sense, i the impingment effect is the jetting to attack the boundary layer? just say so and im done, thanks all a lot.
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The water hitting the bottom of the hole is the impingment effect. Like hitting a peice of wood with a hammer or running a car into a cement wall.