3 Blade Propeller...
Have a motor combo on a Hacher A40-10S that works well on a 2-BLADE 15x7.
I want to use a 3-BLADE is there a "general" conversion that would get me close, I thought I read somewhere that you reduce the diameter 1 size?? I was going to try a 13x8 3-BLADE
90% of the diameter, same pitch, going from 2 to 3 blades (if the blades have the same shape)
84% of the diameter, same pitch, going from 2 to 4 blades (if the blades have the same shape)
see http://www.mh-aerotools.de/airfoils/ under propellers -> equivalent multiblade propellers
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