Coupers: I had my 7152 (swung by a C90-16F) overhauled by a shop in San Leandro, CA. It came back noticeably smoother. The shop told me that the prop can legally be be repitched several inches - which means that they clamp the hub then take a long bar and twist the blades, continually remeasuring at several stations. I'm pretty sure that the criteria for scrapping the prop is not that it's twisted wrong, but that it is too thin or too narrow at some defined station, or too short (from many filings), or that stress cracks were found when it was magafluxed. There is a minimum length, but I think it's an inch or two shorter than new.
I guess there are some prop shops which will just sand and
repaint and call it an overhaul. A careful shop like the one
which overhauled mine will take the time to overhaul to much
better than limits.
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David Smoler | __ |
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Alon A-2 | \____/ | N6359V
s/n A35 () () () based at RHV
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Mi Vida Loca wrote:
>
> At 09:12 AM 2/12/99 -0700, you wrote:
> >Roger Carson wrote:
> >
> >> Recently changed C-85 engines which now has approx 80 hours. Always
> >getting
> >> a vibration on the recently installed engine between 1800-2200 RPM
> >Received alot of ideas and alot recommended that we move the prop one
hole
> >and try, etc. Since alot said this we thought this would be the first
thing
> >to try. Worked like a charm....
> Had an interesting thing happen today. A friend who recently had his
prop
> overhauled complained that he was experiencing more vibration than
before
> the overhaul...
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