Dennis.Kirby(at)kirtland.
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 Posted: Mon Nov 26, 2007 12:34 pm Post subject: Prop Blade Balance |
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(Note - Subject line changed to reflect current topic)
Larry Bourne wrote: <<...are all 3 blades the same weight now ?? I'd
think they hafta be. >>
Big Lar, and Kolbers -
You are right: prop blades should weigh within fractions of grams of
each other for best, vibration-free performance.
This is one of the reasons I went with a Powerfin. Before I ever
purchased a propeller for my Kolb, I happened to wander into the
Powerfin shop at the Arlington airport (Washington state) and struck up
a conversation with Stuart, the owner. He showed me his entire
manufacturing process. At the end of the production line, the blades
are weighed, with weights noted at both the root and the tip. I
observed one technician drilling out a tiny core from the tip of one
blade and inserting a small metal bar (1/16" diam, about 1/4" long -
more like a piece of wire) into the hole. He told me that he was adding
weight (a tenth of a gram) in order to make it match the weights of the
other two blades. That's how close Powerfin balances their blades.
I love my Powerfin. Although it may not be as robust as a Warp when
engine parts go thru it (oops), it is absolutely smooth at all power
settings.
Dennis Kirby
Mark-III, 912ul, Powerfin 3-blade F-model, in
Cedar Crest, NM
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