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  #11  
Old 03-11-2019, 07:25 AM
BillL BillL is offline
 
Join Date: Sep 2007
Location: Central IL
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Quote:
Originally Posted by GWZ View Post
Hi Phil, Iím thinking of doing the same. Did you have to balance the wheel spinning machine itself? I was wondering how much vibration would be coupled from the spinner upper machine to the tire. Did you use a turned aluminum drive cylinder as shown in the video. I was thinking of using a hard rubber tire from the aviation isle of harbor freight.
Thanks
You should probably think again, depending on the speed alone. The smooth surface allows some slip and will avoid the instant jerk if the friction were higher. I used the type of tire spinner extensively on autos. It will also be perfectly round.
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  #12  
Old 03-11-2019, 10:57 AM
GWZ GWZ is offline
 
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Location: Greenfield, IN
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Yep, youíre probably right, at this point just pondering options for quick and easy. Iím just planning on doing my own so Iím not looking to build a commercial quality setup. Iíll report back if whatever I come up with actually works...
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  #13  
Old 03-11-2019, 11:45 AM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is offline
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
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Exact same thing happened to the guy who bought my RV-10. Considering my caution to him on his landing technique was ignored, I did not find this surprising.
Luckily the RV-10 is now in the hands of itís third owner who seems to be interested in my counsel.

Carl
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  #14  
Old 03-11-2019, 12:21 PM
TimO TimO is offline
 
Join Date: Feb 2005
Location: Wisconsin
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Is it just me who thinks those breaks seem awfully straight, like maybe along a fiberglass layup line or something? I'm surprised that it was that defined.
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  #15  
Old 03-11-2019, 01:04 PM
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
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Nose wheel shimmy can be a very violent event. It is very similar to control surface flutter and as shown, can do damage to a wheel pant or nose gear assembly in the same way.

I have not looked at the production drawing for the aft portion of the wheel pant, but I would not be surprised if there isn't a reduction in layup thickness in the vicinity of the failure line shown in the photos.

That does not mean that the wheel pant is badly designed.... it just means that like everything else on the airplane it is designed to specific limits that would never be exceeded as long as everything is maintained properly, and the airplane is operated inside of the limits of normal operations,
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  #16  
Old 03-11-2019, 01:07 PM
rocketman1988 rocketman1988 is offline
 
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Location: Sunman, IN
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Default Bulkhead

Isnít there a bulkhead just aft of that break?
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  #17  
Old 03-11-2019, 01:39 PM
Gusmax Gusmax is offline
 
Join Date: Jun 2014
Location: Sherwood Park, Alberta
Posts: 39
Default RE: Wheel Balancer

I used a 6" x 3" caster like this https://www.casterland.com/collectio...x-3-drpu60lv24

I replaced the bearing with a solid bushing machined on my lathe and I balanced the assembly.

Phil
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  #18  
Old 03-11-2019, 03:05 PM
Michael Wellenzohn's Avatar
Michael Wellenzohn Michael Wellenzohn is offline
 
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Location: Zuerich, Switzerland
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I found a potential reason why it broke, shimmy was the cause but at least a contributing factor to the failure might have been that the brackets were not between the washers 062 25783054 and the fork.
So lesson learned when you mount the rear nose wheel fairing make sure its captured in between the nosewheel fork and the washers 062 25783054.

Bracket
https://photos.app.goo.gl/bdFNagd6oKH8KHBr6?.jpg

Drawing (thanks Dominik)
https://photos.app.goo.gl/AVRYGZAQnTpcLbKt5?.jpg

I hope that learning from this mistake prevents other from having the same experience.

Regards
Michael
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Last edited by Michael Wellenzohn : 03-11-2019 at 03:07 PM.
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  #19  
Old 03-11-2019, 03:16 PM
leok leok is offline
 
Join Date: Apr 2013
Location: Clarkston, MI
Posts: 242
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Was the bracket not captured, or did it pull out with the shimmy? I assume if it puled out, the nut/bolt would be loose.
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  #20  
Old 03-11-2019, 04:40 PM
GWZ GWZ is offline
 
Join Date: May 2009
Location: Greenfield, IN
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Quote:
Originally Posted by Gusmax View Post
I used a 6" x 3" caster like this https://www.casterland.com/collectio...x-3-drpu60lv24

I replaced the bearing with a solid bushing machined on my lathe and I balanced the assembly.

Phil
Thanks, Phil!
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