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Old 2nd Jan 2003, 23:23
  #150 (permalink)  
Nick Lappos
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Dave,
The cause of this is the fact that the ground suppresses the outflow, and allows the blade to deliver the same lift with less angle of collective. This is a bent flow discussion, not a pressure discussion. Note in the plot that Chiplight provides shows the equivilent circulation that the ground "provides" that helps explain the change in flow.