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Take your pick, which propeller did you claim had an efficiency of 0.8?
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That is a standard assumption in aircraft performance for power producers. It assumes a good propeller design.
The data listed below is peak efficiency which is a small part of the advance ratio curve. When you average out the entire curve, it comes out to ~.8 for a well designed propeller.
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Rotol RA 611 0.924
Rotol RA 621 0.920
Rotol RA 600 0.911
Rotol RA 640 0.940
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