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Old Jul 07, 2012, 09:33 AM
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Joined Dec 2007
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3 Blade Propeller...

Hi all,
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

Thanks
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Old Jul 07, 2012, 09:36 AM
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visioneer_one's Avatar
St. Thomas, VI
Joined May 2001
130 Posts
I was taught that you go down one and up one.
Down in diameter, up in pitch.
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Last edited by visioneer_one; Jul 07, 2012 at 01:54 PM.
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Old Jul 07, 2012, 12:07 PM
Bypass Ratio = Infinity
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United States, NC, Jacksonville
Joined Apr 2006
1,653 Posts
This wont help your situation but I have a setup that uses an 18x12 for 2kW and I get the same 2kW with a 15.5x12 4-blade APC prop. I would say the 13x8 would be a good place to start. Just put it on a watt meter and see how it does.
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Old Jul 08, 2012, 03:39 AM
hul
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Switzerland
Joined Mar 2003
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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

Hans
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