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  #61  
Old 05-25-2022, 06:38 PM
riobison riobison is offline
 
Join Date: Jul 2011
Location: Oliver BC & Red Deer Alberta Canada
Posts: 453
Default wood to the metal

I'm wondering if anyone has gone from the wood to the metal and if there was any improvement?

Thanks
Tim
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  #62  
Old 06-26-2022, 11:57 AM
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Ironflight Ironflight is offline
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Join Date: Jan 2005
Location: Dayton, NV
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Quote:
Originally Posted by riobison View Post
I'm wondering if anyone has gone from the wood to the metal and if there was any improvement?

Thanks
Tim
I just finished doing this on our -3, and with only one test flight in the box, I can still give a pretty definitive “yes” to the question. Our wooden stiffeners were on there from day one, and with almost 800 hours, they had become loose, and were doign very little. The truth is, we have always had a shimmy with these spindly RV-3 legs - we just controlled it with lower tire pressure, braking, and avoiding certain taxi speeds.

Installing metal dampers was probably a total of about six hour’s work - I spread it out over a couple of days, but it was straightforward. Based on notes from Dave Paule, I used 1/8” x 1-1/2” aluminum, and seven Adel clamps. I removed the rubber from the Adel clamps, mostly because I was worried about the outside diameter affecting the fit of our gear leg fairings. Largest Adel is -18, smallest is -12, and they are spaced to where they are naturally tight on the gear leg for their diameter - note that this is NOT evenly spaced. There’s a single wrap of Gorilla Tape under each clamp, just to seat them better.

Spacers were required between the clamp and the metal bar stock to put the center of the bar stock through the center of the gear leg. Screws are low-profile #10 Allen heads, 1” long, and fastened with low profile nylon lock nuts. Washers and s machined bushings were used for spacers, and there was approximately a single washer difference between adjacent clamps. The existing gear leg fairing fit right back in place!

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Last edited by Ironflight : 06-26-2022 at 06:48 PM.
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  #63  
Old 06-26-2022, 01:10 PM
David Paule David Paule is offline
 
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Location: Boulder, CO
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Thanks, Paul, this is good to know.

Dave
RV-3B under construction, on gear, engine hung
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  #64  
Old 06-27-2022, 10:23 AM
riobison riobison is offline
 
Join Date: Jul 2011
Location: Oliver BC & Red Deer Alberta Canada
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Default wood to metal

Thanks as well Paul.

Tim
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  #65  
Old 06-27-2022, 01:31 PM
jrs14855 jrs14855 is offline
 
Join Date: Apr 2008
Location: Lake Havasu City AZ
Posts: 2,783
Default Shimmy

On my Wittman Tailwind the problem has always been the left gear. I tried the metal strip, no rubber padding, no gorilla tape. It seemed to help at first, then revferted back to not quite as bad as before.
I am now installing the wood strips with double wrap of 2" fiberglas tape with epoxy resin.
The shimmy occurs at relatively low speed, around 25 statute on the gps. It is not terrible but certainly annoying.
This is my second Tailwind which gives me 58 years total experience with the Wittman round gear.
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  #66  
Old 06-27-2022, 04:15 PM
RV8JD RV8JD is offline
 
Join Date: Jan 2005
Posts: 418
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"Hitt7A" used a fiberglass/carbon fiber stiffener with success:

https://vansairforce.net/community/s...d.php?t=186409
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