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Thom Riddle
Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
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 Posted: Sun Apr 20, 2008 8:23 am Post subject: nose gear shimmy |
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For the first time ever, I had a bit of nose gear shimmy after landing. Our Allegro is the oldest one in the USA so perhaps no one else has yet experienced this. Ours has 565 hours on it. Upon inspecting, I found the "drawbar attachment bearing" allowing a little fore/aft movement. Ours is factory built so I've not had to install or remove this part which is referred to as "store number" 06-03 and "catalogue number" 6001260 in my assembly manual.
My questions:
1) Have you had any nose gear shimmy?
2) If so, was this the cause or was it something else?
3) For those who built their Allegro, what is involved in removing the old one and installing the new part? It looks like removing the fork and the lower "spacer" will allow it to be slid off the nose gear tube.
4) I've asked B Bar D for price and availability but have not hear back from them yet.
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_________________
Thom Riddle
Buffalo, NY (9G0)
Don't worry about old age... it doesn't last very long.
- Anonymous |
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Thom Riddle
Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
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| Posted: Tue Apr 22, 2008 3:20 am Post subject: nose gear shimmy |
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Hugh,
It sounds like you've paid your dues on the drawbar.
When I inspected the nose gear after the shimmy developed the only
place I saw any relative movement was between the drawbar bearing and
the nose gear tube. I"ll inspect more carefully all the drawbar
connection points to confirm there is none there too. I can see how
the drawbar is installed/removed. My question was about removing the
drawbar bearing, not the drawbar itself. Unless I discover relative
motion elsewhere it appears that the sleeve bearing material, which
appears to be made of nylon, Delrin, UHMW or something of the sort,
has worn out. If that is the case, which seems likely, then replacing
that bearing or at least the sleeve material should resolve the problem.
I will take you up on your offer of faxing me what you have. My fax
number is (425) 920-8010. I'd like to see if what you have is the same
as what is in the PDF file of the assembly manual that B Bar D finally
sent me a couple years ago after begging them for more useful
information. I've still not heard back from them on my request for
price and delivery of the bearing so I'll call them. If you don't have
the PDF file (only paper copy?) and would like it, let me know and
I'll send it to you. I also strong armed them into giving me their
spreadsheet file with part numbers. If you don't have that and want
it, let me know.
There is now a second Allegro in western New York, about 65 air miles
south of me. He bought it from the first owner who had very little
time in type when he broke it during a hot landing without flaps.
Apparently he had not learned how good a glider the Allegro is and
couldn't get it to come down so he forced it on, nose wheel first. The
pilot was not injured but the airplane had major structural damage,
including fuselage, main gear, nose gear and firewall, and prop. He
hauled the fuselage to a composite expert in New Mexico and had it all
repaired. I saw the airplane last weekend and it looked brand new,
inside and out. That composite guy in New Mexico really knows his
stuff. Now the current owner is waiting (still) for a new nose wheel
from B Bar D, which broke during the accident last year. It has been
inspected and is ready to fly again except for the wheel.
Thom in Buffalo
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_________________
Thom Riddle
Buffalo, NY (9G0)
Don't worry about old age... it doesn't last very long.
- Anonymous |
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hgmckay
Joined: 23 May 2006
Posts: 397
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| Posted: Tue Apr 22, 2008 5:33 am Post subject: nose gear shimmy |
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Thom:
Sorry I did not clearly understand your email. I may still not understand
the item in question. Are you talking about the small swivel bearing that is
pressed in the back end of the draw bar, or are you talking about the large
nylon (?) sleeve bushing that is on the front gear aluminum pipe which
attaches to the front end of the draw bar? If it is the small swivel
bearing, I believe it is pressed in the back end piece of the draw bar. If
it is the large nylon (?) bushing, it can easily be replaced.
I will fax you the two sheets from my assembly manual. The quality of the
two sketches and the numbering system was not very clear, so I have marked
the numbers in a clearer manner. If you have any questions email or call me
at 704-483-9509 (home), or 704-661-8271 (cell). Yes, I would like a copy of
your pdf file for the assembly manual, and parts list spread sheet. I only
have one paper copy of the assembly manual. Even though I have numerous
notes and additional hand written information on my paper copy, if it ever
was lost I would at least have a back up pdf of the manual itself. I'll fax
the two sheets today.
Hugh
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