Today's Message Index:
----------------------
1. 01:05 PM - Re: Engine Vibration (Guy Buchanan)
2. 01:51 PM - Re: Engine Vibration (Roger Lee)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Engine Vibration |
At 03:14 AM 6/13/2008, you wrote:
>It seems the bolts attaching prop to engine were fractionally too
>long so that torquing them up wasn't tightening them properly. We
>are talking microns here but enough to allow a resonance on certain
>days given certain conditions. A little wear on the washers reduced
>the tension causing the sudden change. Temperature may have been
>expanding or contracting various bits such as hub and bolts to make
>more or less tension as well. A little wear on the hub and "smoke"
>on the back of the hub suggested that things were moving.
Geoff,
Thanks for posting this. I believe I have the same problem,
but couldn't figure out the "smoke".
Guy Buchanan
San Diego, CA
K-IV 1200 / 582-C / Warp / 100% done, thanks mostly to Bob Ducar.
Do not archive
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Engine Vibration |
Hi Guys,
If you have smokey bolts, rivets or whatever it usually means something is lose
and rubbing. It may not look or feel lose to the touch, but it is under stress
or vibration.
We just had a Lightening aircraft crash here in the Tucson area. The Lightening
is a low wing ELSA homebuilt. It was fairly new with about
30-40 hours or so. It lost the prop in low level flight and from what I have been
told second hand was that he tried to turn back toward a landing site with
a 180 degree turn. He was way too low and went in hard. It was a fatality. He
would have been better off staying straight and stalling into the low ground cover
bushes. He may have turned over, but he would have walked away. I won't make
a 180 turn less than 400' in my FDCT and you better be doing things right
at that altitude. Sometimes a messed up plane is imminent, but picking the lesser
of the evils for a landing site and saving your skin is a better choice.
It's sad when anyone dies enjoying what they love.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Service Center
520-574-1080
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=188003#188003
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|