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I've returned from study mode and think I may now understand what you mean: The calculated slip we are discussing is theoretical, since we cannot easily measure actual slip.
So a calculated slip of -5% indicates the 18p Advantage 4.25 typically behaves like a 19p prop, but if calculated slip is +5%, then we're talking about the 20p prop behaving as if it were 19p. Am I warm?

My previous question was poorly worded...I was more curious about your opinion on the use of the 4-blade Powetech in this application...advantages and disadvantages.

thank you