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Heim bearings for landing gear struts.

 
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steven.d.dortch(at)gmail.
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PostPosted: Thu May 11, 2017 1:27 pm    Post subject: Heim bearings for landing gear struts. Reply with quote

I have ordered material for my die spring struts. 

However, Terry hands pictures show heim bearings. Others don't. My current bungee system just has holes drilled in the tube.
Opinions?


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taildrags



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PostPosted: Thu May 11, 2017 8:01 pm    Post subject: Re: Heim bearings for landing gear struts. Reply with quote

Steve; if you'll read William's description of how he built the gear on (I believe it was) Terry's airplane, the ball end fittings were used to allow for perfect alignment and orientation of the landing gear geometry. If you were building a jig to produce numbers of this landing gear all the same, you would work out the exact weldment shapes and tubing lengths using the ball joints and once it was all dialed in, you would then jig it all up for production and eliminate the adjustability (and save a little weight in the process). Building a one-off, the ball end fittings give you a means of adjusting the geometry in almost all three axes to get it spot-on without having to rework joints and fiddle with it endlessly.

I'll have to go back and re-read the narrative, but I think that's what William was describing in the build-up using the ball end fittings.

If your welder does a careful job with jigging, welding, and measuring as he/she fabricates, you'll end up pretty good without the ball end fittings. If not, your airplane may not track straight or it might wear one tire faster than the other, or exhibit other slightly funny things. I could just say that Mr. Pietenpol never used ball end fittings on his landing gear, but then again I also reserve the right to get smarter and learn nifty tricks that other builders have developed in the years since 1929!


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Oscar Zuniga
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Air Camper NX41CC "Scout"
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jarheadpilot82



Joined: 21 Mar 2011
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Location: Athens, GA

PostPosted: Fri May 12, 2017 12:58 am    Post subject: Re: Heim bearings for landing gear struts. Reply with quote

In case others have not seen what Steve is talking about, here are photos of the ends of the die spring rods on my gear -

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Terry Hand
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PostPosted: Fri May 12, 2017 2:01 am    Post subject: Heim bearings for landing gear struts. Reply with quote

(at)font-face{font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;}
I reused my strut ends. There isn't much rotation on the assembly.
Ben

On May 11, 2017, at 5:29 PM, Steven Dortch <steven.d.dortch(at)gmail.com> wrote:
I have ordered material for my die spring struts. 

However, Terry hands pictures show heim bearings. Others don't. My current bungee system just has holes drilled in the tube.
Opinions?


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jarheadpilot82



Joined: 21 Mar 2011
Posts: 673
Location: Athens, GA

PostPosted: Sun May 14, 2017 6:31 pm    Post subject: Re: Heim bearings for landing gear struts. Reply with quote

Steve,

Let me give you the measurements as seen in the picture above -

The space between the plates that the bearing sits in is approximately 0.75 inch. The diameter of the bolt going through the bearing and both plates is 0.375 inch. The threads on the shank of the bearing are, I am guessing, 0.875 as the inner diameter of the 1.00 inch tubing with 0.83 wall thickness is 0.834 inch (I forgot to measure it.

Let me know if I need to measure anything else.


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Terry Hand
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