I don't know jack about slippage, but I think it is the percentage difference between actual distance traveled and theoretical distance traveled if your propeller corkscrewed through the air with no thrust. I found a prop slip calculator online and for 86 inch pitch, 2.85 gear ratio, 7000 rpm, 180 mph, I get 10% slip. Granted the calculator was for boat propellers, but I don't think it matters as long as the units are correct. There has to be some slip because there would be no thrust otherwise. So what is considered a reasonable or good amount of slip? Using Bill's numbers 86 inch pitch, 2.85 gear ratio, 7000 rpm, 200 mph, I get 0% slip. That can't be right!
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