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Aug 19, 2005, 01:00 AM
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Balancing a 4 Blade Prop??

Hi Guys,
I'm building a P-51 and bought a big APC 4 blade prop for it(15.5" by 12" pitch. I'm going to round off the tips and bring it down to a 13" prop.. I normally use the magnetic prop balancer for my 2 blade props. However, how can you balance a 4 blade prop. It's kind of a confusion question - do I balance it just like a 2 blade? How can I tell when it's all balanced out?
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Aug 19, 2005, 10:41 AM
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It seems complicated, but it's really simple. With a 2 blade prop, you want it to stop horizontal typically. This could(it's a bit of a stretch) be misleading, because if it always stops in the same horizontal position, the hub could be heavier on one side(nitpicking, I know). The other way is to observe if the prop stops in a different position every time, without dropping a blade after slowing down. With 3+ blades, you follow that last convention: it should stop in a different position every time when balanced.
Last edited by BuzzBomber; Aug 19, 2005 at 10:44 AM. Reason: revised info

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