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Main Gear Shimmy - While Braking

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jkreidler

Joined: 13 Feb 2008
Posts: 151
Location: Sheboygan Falls WI

Posted: Tue Nov 24, 2009 6:19 pm Post subject: Main Gear Shimmy - While Braking

We have been working on solving a main gear shimmy while braking.  First just to clarify our symptoms, after landing, after the nose wheel comes down, as soon as we went to the brakes we got a shimmy.  If we did not use the brakes we did not have a shimmy.  We visually confirmed it was main gear shimmy.  We also had a scalloped wear patter starting on our mains (80 hours TT).



I may be stating something very obvious, but the fix was very simple, we had to re-torque our axle nuts.  Tightened up the nuts, and the shimmy is gone.



Just passing along an experience.....

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_________________
Jason Kreidler
4 Partner Build - Sheboygan Falls, WI
Tony Kolar, Kyle Hokel, Wayne Elser, Jason Kreidler
N44YH - Flying - #40617

Strasnuts

Joined: 10 Feb 2009
Posts: 502
Location: Salt Lake City, UT

Posted: Tue Nov 24, 2009 7:12 pm Post subject: Main Gear Shimmy - While Braking

This is why I think a lot of the gear legs are misaligned.  My right gear was toed in and my left was toed out until I drilled the left gear to match the right at 1.10 degrees in. 

---

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40936
RV-10 SB N801VR Flying
780 Hours
SuperSTOL 60 hours

jkreidler

Joined: 13 Feb 2008
Posts: 151
Location: Sheboygan Falls WI

Posted: Wed Nov 25, 2009 4:17 am Post subject: Re: Main Gear Shimmy - While Braking

I am not sure I understand your statement....  Please expand.



My point in passing this along was really to say that for us (again for us), the fix was as simple as tightening the axle nut.  This solution came after checking toe, contemplating balancing tires, researching brake failure modes, etc.



In the end after hours of head scratching it was just a basic maintenance item.  Possibly everyone on the list who has faced main gear shimmy issues has a different problem, but I could not find this solution anywhere.  I also couldn't find a case of someone who changed their toe setting and solved the problem.

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_________________
Jason Kreidler
4 Partner Build - Sheboygan Falls, WI
Tony Kolar, Kyle Hokel, Wayne Elser, Jason Kreidler
N44YH - Flying - #40617

indigoonlatigo(at)msn.com
Guest

Posted: Wed Nov 25, 2009 9:52 am Post subject: Main Gear Shimmy - While Braking

I see that on mine also Rt In C Lf Out. Problem is not necessarily corrected by changing the hole location as it may be the bend in the gear leg itself.

[quote] To: rv10-list(at)matronics.com

 Subject: Re: Main Gear Shimmy - While Braking

 From: sean(at)braunandco.com

 Date: Wed C 25 Nov 2009 03:06:28 +0000

 --> RV10-List message posted by: sean(at)braunandco.com

 This is why I think a lot of the gear legs are misaligned. My right gear was toed in and my left was toed out until I drilled the left gear to match the right at 1.10 degrees in. 

 ---

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Strasnuts

Joined: 10 Feb 2009
Posts: 502
Location: Salt Lake City, UT

Posted: Wed Nov 25, 2009 7:14 pm Post subject: Re: Main Gear Shimmy - While Braking

jkreidler,

Sorry about the reply, I received it on my phone and didn't see your fix from the weird format on my phone.  I just thought you had a shimmy and you didn't know what was wrong.

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_________________
40936
RV-10 SB N801VR Flying
780 Hours
SuperSTOL 60 hours

ajs_pvt_1(at)sbcglobal.ne
Guest

Posted: Wed Nov 25, 2009 7:34 pm Post subject: Main Gear Shimmy - While Braking

Not obvious so some of the lesser experienced here (i.e. me).  Thanks 

for the info!



Andrew Stryker

Building - Empennage



jkreidler wrote:

 	  Quote: 	
		   



 We have been working on solving a main gear shimmy while braking.  First just to clarify our symptoms, after landing, after the nose wheel comes down, as soon as we went to the brakes we got a shimmy.  If we did not use the brakes we did not have a shimmy.  We visually confirmed it was main gear shimmy.  We also had a scalloped wear patter starting on our mains (80 hours TT).



 I may be stating something very obvious, but the fix was very simple, we had to re-torque our axle nuts.  Tightened up the nuts, and the shimmy is gone.



 Just passing along an experience.....



 --------

 Jason Kreidler

 4 Partner Build - Sheboygan Falls, WI

 Tony Kolar, Kyle Hokel, Wayne Elser, Jason Kreidler

 N44YH - Flying - #40617





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p 74711#274711

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