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1. 09:37 PM - Re: FW: Wing Strut Attachment (Jim Boyer)
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| Subject: | Re: Wing Strut Attachment |
Greg, what is the piece of metal that comes out of the strut and is then al
so bolted to the bolt through the wing lift strut straps? I am not referrin
g to the aluminim 3/4" that the lift strut fork is threaded into. It looks
like a separate metal strap from your 3/4" piece to the bolt in the spar li
ft straps. Thanks, Jim B.
> On January 5, 2018 at 3:21 PM Greg Cardinal <gcardinal@comcast.net> wrote
:
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> John,
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> A rod end bearing was used when the steel struts were replaced with t
he Carlson aluminum struts on NX18235. The Aurora HX Series rod-end bearin
g is a good choice because it has a wider ball dimension to fit between the
spar strap fitting.
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> A drilled and tapped =C2=BE=9D square steel bar was inserted in
the strut instead of using the Carlson aluminum block.
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> When doing the engineering analysis of your assembly pay attention to
the edge loading of the bolt holes that are drilled through the struts to
determine how many bolts to use to secure the strut to the insert.
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> Greg Cardinal
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> Minneapolis
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> From: owner-pietenpol-list-server@matronics.com mailto:owner-pietenpo
l-list-server@matronics.com [mailto:owner-pietenpol-list-server@matronics.c
om] On Behalf Of John C Black
> Sent: Thursday, January 4, 2018 10:15 AM
> To: pietenpol-list@matronics.com mailto:pietenpol-list@matronics.com
> Subject: Pietenpol-List: Wing Strut Attachment
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> Today I am worrying about how to attach the Struts.
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> What are you guys doing to attach the Struts ?
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> The top Strut fitting is especially challenging.
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> I am using a Carlson Aircraft extrusion for my struts.
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> To attach the strut, Carlson sells a 1=9Dx3/4=9D aluminum
extrusion that slides into the end of the strut. Then you bolt it in pla
ce. I cut this extrusion into 8=9D lengths. I put this 8
=9D piece in the lathe and end drilled and threaded a 7/16 hole 2=9D
deep into the strut.
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> On the lower end I plan to use this wing strut adjustment fork from A
ircraft Spruce. https://www.aircraftspruce.com/catalog/appages/strutadjfbse
ts2.php
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> The top end is more challenging. The wing may move forward or back t
o adjust weight/balance. This movement changes the angle that the strut me
ets the wing so the attachment needs to be flexible. I see that
some builders have used a helm joint. This is a simple solution, but I won
der about the loads on the fitting. The strongest Helm joint that I could
find is rated at 14,000 lbs :
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> That is a little weaker than the strut.
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> What are you guys doing ?
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> John
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