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SAOLESEN(at)sirentel.net
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 Posted: Sat Apr 04, 2009 8:47 am Post subject: Missing parts on repaired prop? |
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I had a leaky seal on my Hartzell prop at about 50 hours and took it
in for repair. After a week, I got it back yesterday and was
reinstalling it this morning when I noticed that there were parts on
one side of the hub where the bade is attached that weren't on the
other side. One side has 2 screws, an aluminum piece, and safety wire
going across the hub at both the leading and trailing edges of the
prop blade. The other side has nothing. It would seem that for
rotational balance these parts should be on both sides of the hub.
If this prop had not just come back from repair I would not be
suspicious that something was forgotten. Would someone who has a
prop sitting in a box at home look and see if these parts should be
on both sides of the hub? I have enclosed pictures of what I am
concerned about.
The prop shop said that there is some guidance from Hartzell on props
that have been sitting in a box for a long time. Mine sat in a box
for about 2 years and that may have the cause of the early leakage
from the seals.
Thanks
Sheldon Olesen
N475PV 53.6 hours
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Bob Turner
Joined: 03 Jan 2009
Posts: 885
Location: Castro Valley, CA
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| Posted: Sat Apr 04, 2009 10:51 am Post subject: Re: Missing parts on repaired prop? |
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I believe you are looking at weights put on for static balance. On some props I've seen stacks of these. So one side only would be normal.
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Bob Turner
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jcumins(at)jcis.net
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| Posted: Sat Apr 04, 2009 1:42 pm Post subject: Missing parts on repaired prop? |
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Sheldon
What your talking about are weights that balance the prop. All props are
balanced statically at the prop shop. They add or remove the thin weights
and the base of the prop blades.
This is very common. Once you are flying and have about 200 hours on the
engine and prop combo you should have them dynamically balanced by some one
who knows how to do it correctly. It is way worth the cost.
John G. Cumins
40864 Starting elevators
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