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  #31  
Old 07-09-2022, 09:44 PM
yarddart yarddart is offline
 
Join Date: Jun 2006
Posts: 206
Default Rv3b

I had slight shimmy corrected with tire change to Goodyear and balancing them . Now 35psi
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  #32  
Old 07-10-2022, 09:50 AM
David Paule David Paule is offline
 
Join Date: Dec 2009
Location: Boulder, CO
Posts: 5,491
Default

Let us know if that holds once you've got some tire wear.

Dave
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  #33  
Old 07-10-2022, 11:39 AM
PilotjohnS PilotjohnS is offline
 
Join Date: Jan 2016
Location: Southwest, USA
Posts: 2,526
Default Thanks for participating

Thanks for all those participating in this thread.

I have decided to do this to my 9A; the data here is really helpful.
__________________
John S

WARNING! Information presented in this post is my opinion. All users of info have sole responsibility for determining accuracy or suitability for their use.

Dues paid 2022, worth every penny

RV9A- Status:
98% done, 2% left to go
To Go: wing mounting, engine baffles, wing tips, move to airport
www.pilotjohnsrv9.blogspot.com
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  #34  
Old 08-04-2022, 08:05 PM
wirejock's Avatar
wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 5,711
Default Adels

Quote:
Originally Posted by Ironflight View Post
<snip>...
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!
Paul
I'm getting ready to order parts for this. You mentioned seven Adel clamps each side, 18 to 12 size Adel clamps. Do you remember how many of each size Adel clamps were used? One each from 18 through 12? However, it may be pairs of certain sizes. I prefer keeping the rubber cushions. That probably changes the sizes as well. Guess I can order extra. Just trying to avoid more shipping charges from ACS.
Thanks.
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Larry Larson
Estes Park, CO
E-mail: wirejock at yahoo dot com
Builder Blog: http://wirejockrv7a.blogspot.com
Donated 12/01/2021, plus a little extra.
RV-7A #73391, N511RV reserved
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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  #35  
Old 08-04-2022, 09:00 PM
David Paule David Paule is offline
 
Join Date: Dec 2009
Location: Boulder, CO
Posts: 5,491
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Remember, Larry, Paul did this to his RV-3B, the small taidragger. Might differ for your -7A.

Rick B. has a -6A and did this, so he might be able to give you some info.

Dave
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  #36  
Old 08-04-2022, 10:09 PM
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Ironflight Ironflight is offline
VAF Moderator / Line Boy
 
Join Date: Jan 2005
Location: Dayton, NV
Posts: 13,230
Default

Quote:
Originally Posted by wirejock View Post
Paul
I'm getting ready to order parts for this. You mentioned seven Adel clamps each side, 18 to 12 size Adel clamps. Do you remember how many of each size Adel clamps were used? One each from 18 through 12? However, it may be pairs of certain sizes. I prefer keeping the rubber cushions. That probably changes the sizes as well. Guess I can order extra. Just trying to avoid more shipping charges from ACS.
Thanks.
I brute forced the project Larry - I ordered four of each size from -21 to -9 from B&B and had enough of everything, plus a bunch left over (I was low on stock anyway, and they are cheap, so it all worked out….). I used one of each size on each gear leg - no repeats.
__________________
Paul F. Dye
Editor at Large - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)
http://Ironflight.com
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  #37  
Old 10-29-2022, 03:44 PM
PilotjohnS PilotjohnS is offline
 
Join Date: Jan 2016
Location: Southwest, USA
Posts: 2,526
Default My way

I followed Paul Dye’s lead and used adel clamps, one of each size and one layer of gorrilla tape instead of the rubber inserts. I wanted some adhesive that would grip the legs and not let the clamps wiggle down the tapered leg.

I bent the adel clamps so the gap was centered on the hoop, if that makes sense. I ended up putting the metal between the adel clamps to align the metal with the centroid of the legs.

For screws I used steel button head allen type 10-32s and thin (shear) self locking nuts.

The clamps worked out to be exactly the same distance apart with the total distance between top clamp and lowest about 20.25”

I am really happy with the way it turned out, but proof is in the first flight. Tell then….
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__________________
John S

WARNING! Information presented in this post is my opinion. All users of info have sole responsibility for determining accuracy or suitability for their use.

Dues paid 2022, worth every penny

RV9A- Status:
98% done, 2% left to go
To Go: wing mounting, engine baffles, wing tips, move to airport
www.pilotjohnsrv9.blogspot.com

Last edited by PilotjohnS : 10-30-2022 at 06:15 PM.
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  #38  
Old 11-19-2022, 08:46 PM
Cloudboy Cloudboy is offline
 
Join Date: Dec 2021
Location: Deer Park, Washington on WT-21
Posts: 34
Default Results?

My RV-3B has the shimmy problem. I've collected the Adel clamps and aluminum bar, read all the posts and puzzled about what it means to decouple lateral force from fore and aft shimmy. Rather than balance the wheel pants, run my tire pressure so low I strain to push the airplane, etc., I would rather remove the wooden stiffeners and install the aluminum. All that's holding me back is the lack of exuberant endorsement, ringing praise or a declaration that the problem is cured once and for all. So far it seems the results are positive but subject to further testing.
Are any of you satisfied that the aluminum stiffeners have solved your shimmy problem?
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  #39  
Old 11-20-2022, 12:06 AM
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Ironflight Ironflight is offline
VAF Moderator / Line Boy
 
Join Date: Jan 2005
Location: Dayton, NV
Posts: 13,230
Default

Quote:
Originally Posted by Cloudboy View Post
My RV-3B has the shimmy problem. I've collected the Adel clamps and aluminum bar, read all the posts and puzzled about what it means to decouple lateral force from fore and aft shimmy. Rather than balance the wheel pants, run my tire pressure so low I strain to push the airplane, etc., I would rather remove the wooden stiffeners and install the aluminum. All that's holding me back is the lack of exuberant endorsement, ringing praise or a declaration that the problem is cured once and for all. So far it seems the results are positive but subject to further testing.
Are any of you satisfied that the aluminum stiffeners have solved your shimmy problem?
While there is still some noticeable “flexibility” to the main gear with the metal dampers, on our airplane, they are a huge upgrade from the wooden stiffeners. With the wood, which was actually beginning to delaminate (so not doing a lot of good) there were taxi speeds that I really didn’t want to spend any time at. Now, I find the airplane is fine in all operations.

The only real caveats I’ll give is that no two RV-3’s are identical, and so far, no two installations of metal dampers have been identical, so we’re still experimenting, and results coudl vary. But I have yet to hear anyone say that they want to tear out the metal and go back to wood.

Paul
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Paul F. Dye
Editor at Large - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)
http://Ironflight.com
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  #40  
Old 11-20-2022, 10:59 AM
1rv4 1rv4 is offline
 
Join Date: Jul 2005
Posts: 34
Default Shimmy?

Getting closer to mounting the gear on my 3/ 3B and after reading through this thread was wondering if all RV3's suffer from the shimmy in varying degrees, if not ,why some and not others? Any thoughts or theories?
Chris
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