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Old 06-30-2022, 09:40 PM
PilotjohnS PilotjohnS is offline
Join Date: Jan 2016
Location: Southwest, USA
Posts: 2,592
Default OK

Originally Posted by David Paule View Post
so the most weight efficient material for buckling resistance is the lowest density of these.


I have seen too many old 914s go up in flames with wheel fires, so I wont be using magnesium. I guess aluminum is best. Now should it be 6061 or 7xxx?
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 2023, worth every penny

RV9A- Status:
98% done, 2% left to go
To Go: wing mounting, engine baffles, wing tips, move to airport
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Old 07-01-2022, 06:29 AM
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DanH DanH is offline
Join Date: Oct 2005
Location: 08A
Posts: 11,216

Originally Posted by PilotjohnS View Post
I guess aluminum is best. Now should it be 6061 or 7xxx?
At the practical level, they are effectively the same modulus, the property of interest here.
Dan Horton
Barrett IO-390
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Old 07-01-2022, 07:53 AM
eric.the.blonde eric.the.blonde is offline
Join Date: Mar 2017
Location: Ann Arbor
Posts: 56
Default I'm not sure.

I like it and wish I had the training of a suspension engineer. It seems you have succeeded in stiffening the spring in the same direction the system's dampeners (tires) perform poorly. The higher inflation pressure suggests/confirms a shift in the harmonic.

It will be interesting to see how much the system wears over time. A failure of one leg's stiffener could prove scary.

I have no training for proper analysis so nothing has or will be acted on: I have often wondered whether a urethane encapsulated gear leg would improve stiffness in the fore-aft direction while also improving dampening. I have also wondered whether welding a rod to the leg (in place of the mechanically attached bar) would achieve the same result.
Eric G.
Ann Arbor, MI
RV-9A under construction (QB fuse)
President, EAA Chapter 333 Flying Stinkers
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Old 07-01-2022, 09:21 AM
David Paule David Paule is offline
Join Date: Dec 2009
Location: Boulder, CO
Posts: 5,559

As for the material, what DanH said.



You'd destroy the heat-treatment of it and add a stress concentration. In fact, except for the RV-3 slider, there's no welding on any part of any of the RVs, as far as I know.

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Old 07-01-2022, 10:27 AM
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EdH EdH is offline
Join Date: Jun 2010
Location: Wiltshire, UK.
Posts: 267

Thanks for this… will be a job on mine at sometime.
RV-3B G-LILB - Ex-N159SJ UK import Sept 2022
RV-3B G-CCTG - Purchased May 2020
RV-8 G-MIRV - Finished July 2019 - sold
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Old 07-01-2022, 11:01 AM
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KiloWhiskey1 KiloWhiskey1 is offline
Join Date: Mar 2006
Location: Kennesaw, GA
Posts: 280

Planning on doing this next week on our 3.

Has anyone used a taper pin in place of the gear leg/engine mount bolt? If so, could you please post the part number?
Keith Ward
Current: RV-10 N253RV, RV-3 N235RV
Sold: RV-7 N818PA, RV-7 N818KW, RV-8 N626JL, Christen Eagle II N56RJ
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Old 07-01-2022, 01:13 PM
Ralph Inkster Ralph Inkster is offline
Join Date: Feb 2008
Location: Calgary, Alberta
Posts: 2,000
Default AntiSplat?

Maybe AL at AntiSplat should consider this issue as thought for a future product offering...
I think his clamping method would be more superior for this than the Adell clamp approach.
built a few RVs, rebuilt a few more, hot rodded more, & maintained/updated a big bunch more
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Old 07-01-2022, 02:59 PM
Larry DeCamp Larry DeCamp is offline
Join Date: Apr 2010
Location: Clinton, Indiana
Posts: 1,291
Default Antisplat clamp ?

`Can you describe the clamp concept in case Antisplat doesn’t chime in. It is my opinion you can optimize bending modulus and section modulus to perfection, but loose it all with minuscule slack that decouples the beam from the gear leg.
Larry DeCamp
RV3B sold
RV-4 fastback in process w/ Superior roller 360/AFP/G3X/CPI/Catto3b
Clinton, IN
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Old 07-01-2022, 05:34 PM
Ralph Inkster Ralph Inkster is offline
Join Date: Feb 2008
Location: Calgary, Alberta
Posts: 2,000

I was referring to the style of clamp Al used for mounting his bar to the gear leg.

I guess AntiSplat has discontinued his Nose Job product. I assume the market for that product dried up with the introduction of the new style nose gear from Vans.
You can still view it on the AntiSplat website or on his videos.
built a few RVs, rebuilt a few more, hot rodded more, & maintained/updated a big bunch more
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Old 07-01-2022, 06:23 PM
scsmith scsmith is offline
Join Date: Jan 2008
Location: Ashland, OR
Posts: 3,354

I wonder about introducing some actual damping into this system. For example, if the holes in the aluminum plate were drilled 5/16" and then filled with short rubber bushings made from 5/16" neoprene vacuum tubing, or even better some harder rubber, or Delrin, with a 3/16" ID, then put the AN3 hardware through that.

With the rubber cushions removed from the Adel clamps, the only remaining damping is from the Gorilla tape and any slippage. I would anticipate that the Gorilla tape will get cut thru by the Adel clamp edges fairly quickly, leaving the clamps to chafe on the gear leg. I also wouldn't be surprised to find that the Adel clamps fatigue and crack at the 90-degree bend in the clamp.
Steve Smith
Aeronautical Engineer
RV-8 N825RV
IO-360 A1A
WW 200RV
"The Magic Carpet" Flying since Sept. 2009
Hobbs 725
1/4 share in 1959 C-182B (tow plane)
LS6-15/18W sailplane SOLD
bought my old LS6-A back!!
VAF donation Dec 2022
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