Today's Message Index:
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1. 01:12 AM - FT nose gear shimmy (MPPalmer@aol.com)
2. 09:35 AM - Re: FT nose gear shimmy (N16cd@aol.com)
Message 1
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| Subject: | FT nose gear shimmy |
--> Glasair-List message posted by: MPPalmer@aol.com
> Sounds like it's a little to tight.
Agreed. I forget the details of this shimmy problem. I assume everything
was okay for a while and then started recently?
We noticed the shimmy when braking thru about 40 KIAS on landing. I did all
the things I reported last time, and mitigated. The last thing I did which
stopped it for good was to really shim those new nose strut shocks. IIRC, they
calling for something like 3/8" shims top and bottom! (Require longer thru
bolts.) I had to get the instructions from Cliff for the new shocks. If you're
still running the old back to back welded Corvair engine mounts, you don't
have the new shocks.
If you're getting shimmy all the time, there's a wheel balance problem
(bearing bad?) or sagging geometry. Or a broken part.
Might want to try a new nose tire. (I assume you've taken the nose pivot
assembly apart and used copious amounts of brake cleaner on the friction pad?)
Or maybe the tube is ballooning inside?
We've done well for 1500 hours and it was only after changing the nose gear
tire (the Spruce Chinese manufacture) that we started having problems. I still
suspect the tire is out of balance, but since the problem has gone away,
haven't played with trying to achieve a static balance.
Hope this helps,
Mike Palmer <><
Excellence in Ergonomics
2035 hrs, Glasair 1 + 1/2 (Part GI, Part GII)
Message 2
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| Subject: | Re: FT nose gear shimmy |
--> Glasair-List message posted by: N16cd@aol.com
I get a nose wheel shimmy when my nose wheel tire pressure is low. I have to
keep 50 to 60 pounds of tire pressure in order to not have a shimmy problem.
Note: I had one of those pesky engine oil leaks that took me for ever to
find. It turned out to be a broken flange on one of the cylinder rocker valve
chamber oil return lines. The aluminum flange was broken inside of the coupling
sleeve.
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