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Matt Dovey
Joined: 13 May 2017
Posts: 48
Location: st albans, england
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 Posted: Thu Sep 03, 2020 8:58 am Post subject: Nose Wheel Shimmy |
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When landing on a hard runway I always get nose wheel shimmy. I've checked the friction on the on the nose wheel fork and found no problem. Has anyone else had similar problems?
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Burrilla
Joined: 25 Apr 2015
Posts: 184
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| Posted: Thu Sep 03, 2020 9:14 am Post subject: Nose Wheel Shimmy |
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I have never experienced any problems and have the friction set as per the book.
I do have a nose wheel spat, standard speed kit, and also hold the nose off the runway until the authority of the tailplane is lost.
Alan
G-OBJT
| Quote: | On 3 Sep 2020, at 17:58, Matt Dovey <mattdovey(at)hotmail.co.uk> wrote:
When landing on a hard runway I always get nose wheel shimmy. I've checked the friction on the on the nose wheel fork and found no problem. Has anyone else had similar problems?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=498144#498144
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Rocketman
Joined: 07 Sep 2010
Posts: 87
Location: USA, Earth
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| Posted: Thu Sep 03, 2020 1:27 pm Post subject: Nose Wheel Shimmy |
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A little swipe of Nyogel 774VH on both sides of the fiber washer then
torqued to spec will solve the problem.
Jeff
"I believe that forgiving them is God's function. Our job is to arrange
the meeting."
-Gen. Norman Schwarzkopf
On 9/3/2020 11:58 AM, Matt Dovey wrote:
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budyerly@msn.com
Joined: 05 Oct 2019
Posts: 286
Location: Florida USA
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| Posted: Sun Sep 06, 2020 6:16 am Post subject: Re: Nose Wheel Shimmy |
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Replace the plastic disk if it shows signs of wear. Inspect your fork properly.
The nose tire pressure has much to do with the shimmy. If below 20 pounds it is terrible. 35 pounds and it is a delight.
I set my dampener friction between 19 and 21 pounds of pull at the back of the tire. Use a loop of safety wire around the nut long enough to go around the back of the tire (wheel pant off please) and use a fish scale to do the pull test. Typically the break out force is higher than the running or turning force required to maintain the nose fork turn. If it breaks initially at 21 it is fine for asphalt surfaces and for use on grass go a bit lower. 16 pounds is a bit too low for initial break out in my opinion.
Various sticky greases Nylogel or similar help for dynamic steering and taxi ease with the rudder. I find them useful but not necessary with a nice slick plastic disk and smooth surfaces on the metal plates.
If the metal surface is worn with groves, fix it. If the spindle is loose, get a new fork or find someone to fix it dead vertical.
Finally, never inject grease under pressure to lube the nose fork. Grease blows by the O ring and screws up the friction and makes a mess. On my annual condition inspection, I simply remove my fork and tire, inspect the components, check for tightness and lube with a finger full of thick grease (Aeroshell 22) on the recess in the strut receptacle, and bearing area and I'm good for another year. It's been 14 years and still doing well enough.
Bud Yerly
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