Spit/109 sea level speed comparisons in 1.08 beta patch

[Crumpp]

Take your pick, which propeller did you claim had an efficiency of 0.8?

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.

Rotol RA 611 0.924
Rotol RA 621 0.920
Rotol RA 600 0.911
Rotol RA 640 0.940