KR> prop balancing

[Joseph H. Horton]

On Mon, 13 Nov 2006 22:57:29 -0500 "Brian Kraut" 
writes:
> So what was done to improve the balance?
> 
> Brian Kraut
> Engineering Alternatives, Inc.
> www.engalt.com 
> 
>
There was an accelerometer attached to centerline of the engine
and a laser tach hooked up to read the prop. After an initial run up to
2200 rpm the computer analyzed the vibrations and with a degree wheel
over the spinner it told him where to place a certain amount of weight.
He accurately weighted each washer bolt or nut with a small gram scale
and put washers under the closest spinner screw. Then another run up and
another try until it was in tolerance. He then removed the spinner and
placed bolts nuts and washers through drilled holes in the spinner bulk
head to replace the temporary washers under the spinner screws. Then
another run up to check and additional washers under a screw to bring
back in tolerance. One last run up to give a finial reading with
everything complete. At least 6 run ups were required and it took about 1
1/2 hours to complete. 
I'm very sorry to say that I can not comment on the value yet but
I will when I get to fly her.
Joe Horton, Coopersburg, PA.
joe.kr2s.buil...@juno.com

KR> prop balancing

[Jeff Scott]

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