Today's Message Index:
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1. 12:42 PM - Re: Ragwing Ultra-Piet (cdlwingnut)
2. 02:27 PM - Heim bearings for landing gear struts. (Steven Dortch)
3. 09:02 PM - Re: Heim bearings for landing gear struts. (taildrags)
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| Subject: | Re: Ragwing Ultra-Piet |
A picture of my ribs and fuselage side
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http://forums.matronics.com/viewtopic.php?p=469225#469225
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http://forums.matronics.com//files/20170503_175635_resized_549.jpg
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| Subject: | Heim bearings for landing gear struts. |
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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| Subject: | Re: Heim bearings for landing gear struts. |
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
Medford, OR
Air Camper NX41CC "Scout"
A75 power, 72x36 Culver prop
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