Today's Message Index:
----------------------
1. 04:16 AM - FW: Wing Strut Attachment (Greg Cardinal)
2. 08:57 AM - Re: Wing Strut Attachment (jarheadpilot82)
3. 11:26 AM - Re: Wing Strut Attachment (Bill Church)
4. 03:22 PM - FW: Wing Strut Attachment (Greg Cardinal)
5. 03:38 PM - Re: Wing Strut Attachment (John C Black)
6. 04:02 PM - Re: No Title (jarheadpilot82)
7. 09:47 PM - Re: Re: No Title (Steven Dortch)
8. 09:48 PM - Re: Re: No Title (Steven Dortch)
Message 1
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Subject: | Wing Strut Attachment |
John,
A rod end bearing was used when the steel struts were replaced with the
Carlson aluminum struts on NX18235. The Aurora HX Series rod-end
bearing is a good choice because it has a wider ball dimension to fit
between the spar strap fitting.
A drilled and tapped =C2=BE=9D square steel bar was inserted in
the strut instead of using the Carlson aluminum block.
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.
Greg Cardinal
Minneapolis
From: owner-pietenpol-list-server@matronics.com
<mailto:owner-pietenpol-list-server@matronics.com>
[mailto:owner-pietenpol-list-server@matronics.com] On Behalf Of John C
Black
Sent: Thursday, January 4, 2018 10:15 AM
Subject: Pietenpol-List: Wing Strut Attachment
Today I am worrying about how to attach the Struts.
What are you guys doing to attach the Struts ?
The top Strut fitting is especially challenging.
I am using a Carlson Aircraft extrusion for my struts.
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
place. 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.
On the lower end I plan to use this wing strut adjustment fork from
Aircraft Spruce.
https://www.aircraftspruce.com/catalog/appages/strutadjfbsets2.php
The top end is more challenging. The wing may move forward or back to
adjust weight/balance. This movement changes the angle that the strut
meets 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 wonder about the loads on the fitting. The strongest Helm joint
that I could find is rated at 14,000 lbs :
That is a little weaker than the strut.
What are you guys doing ?
John
Message 2
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Subject: | Re: Wing Strut Attachment |
Oscar,
I know that you love this stuff, so how about doing all of us non-engineer types
a favor and do the math. I have done my initial w&b and my cabanes definitely
lean back so I am most likely going to need to use a ball joint rod end as well
for connecting at the wing strut end.
And Oscar, FWIW, my daughter is a Junior at Alabama and is a Metallurgical Engineering
major there. I told her that I couldn't even spell metallurgical engineering
without spell check, much less study it. And a 3.3 GPA to boot! (Statics
and Physics beat her up pretty good last semester.)
--------
Semper Fi,
Terry Hand
Athens, GA
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=477102#477102
Message 3
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Subject: | Re: Wing Strut Attachment |
The data posted on Carlson's website definitely appears to be suspect. The raw
material of the struts, 6061-T6 Aluminum has an Ultimate Tensile strength of about
42000 psi, which, when applied on a cross-sectional area of 0.431 square
inches would translate into an ultimate load of just over 18000 pounds (assuming
that the listed 0.431 square inch area is correct.)
The topic of appropriate size for rod ends on lift struts was discussed several
years ago. This link should answer the original question:
http://forums.matronics.com/viewtopic.php?t=50044&start=0
Bill C.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=477106#477106
Message 4
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Subject: | Wing Strut Attachment |
John,
A rod end bearing was used when the steel struts were replaced with the
Carlson aluminum struts on NX18235. The Aurora HX Series rod-end
bearing is a good choice because it has a wider ball dimension to fit
between the spar strap fitting.
A drilled and tapped =C2=BE=9D square steel bar was inserted in
the strut instead of using the Carlson aluminum block.
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.
Greg Cardinal
Minneapolis
From: owner-pietenpol-list-server@matronics.com
<mailto:owner-pietenpol-list-server@matronics.com>
[mailto:owner-pietenpol-list-server@matronics.com] On Behalf Of John C
Black
Sent: Thursday, January 4, 2018 10:15 AM
Subject: Pietenpol-List: Wing Strut Attachment
Today I am worrying about how to attach the Struts.
What are you guys doing to attach the Struts ?
The top Strut fitting is especially challenging.
I am using a Carlson Aircraft extrusion for my struts.
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
place. 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.
On the lower end I plan to use this wing strut adjustment fork from
Aircraft Spruce.
https://www.aircraftspruce.com/catalog/appages/strutadjfbsets2.php
The top end is more challenging. The wing may move forward or back to
adjust weight/balance. This movement changes the angle that the strut
meets 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 wonder about the loads on the fitting. The strongest Helm joint
that I could find is rated at 14,000 lbs :
That is a little weaker than the strut.
What are you guys doing ?
John
Message 5
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Subject: | Re: Wing Strut Attachment |
THANK YOU EVERYONE for great posts, but I still don=99t know
exactly what I should do.
I have read as suggested. learned a lot. I take back
my errors. Thank you again.
Here are the questions that I still have :
1) Is Aluminum 6061-T6 adequate for the 1=9Dx3/4=9D Bar
Stock that inserts into the Carlson Small Strut and is end drilled plus
tapped to accept the 7/16=9D 20 male end fittings ? Or do I need
to use steel which about triples the weight of the Bar Stock ? I get
lost trying to understand if at least 1=9D of 7/16=9D-20
threads in 6061-T6 aluminum is strong enough ? Or Is steel needed ?
2) Does the side wall of the Carlson Small Strut need to be reinforced
? If so, Is it enough to weld aluminum washers at the bolt holes or
should a 3/4=9D or 1=9D plate be welded on that spans all 3
of the 5/16=9D bolts that I plan to use ?
3) Who has a Tension Test machine ? I am beginning to look for a
Tension Test stand. I want to build a test piece and test it to
destruction.
Thank you Ken Bickers for reminding me that the aluminum strut
arrangement probably is adequate if it is stronger than the Sitka Spruce
struts that are flying around.
John
On Jan 4, 2018, at 8:14 AM, John C Black <john@jcblack.com> wrote:
Today I am worrying about how to attach the Struts.
What are you guys doing to attach the Struts ?
The top Strut fitting is especially challenging.
I am using a Carlson Aircraft extrusion for my struts.
To attach the strut, Carlson sells a 1=9Dx3/4=9D aluminum
6061-T6 bar that slides into the end of the strut. Then you bolt it in
place. I cut this bar into 8=9D lengths. I put this 8=9D
piece in the lathe and end drilled and tapped a 7/16 hole 2=9D
deep into the strut.
On the lower end I plan to use this wing strut adjustment fork from
Aircraft Spruce.
https://www.aircraftspruce.com/catalog/appages/strutadjfbsets2.php
<https://www.aircraftspruce.com/catalog/appages/strutadjfbsets2.php>
The top end is more challenging. The wing may move forward or back to
adjust weight/balance. This movement changes the angle that the strut
meets 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 wonder about the loads on the fitting. The strongest Helm joint
that I could find is rated at 14,000 lbs :
That is a little weaker (I was wrong apparently stronger) than
the strut.
What are you guys doing ?
John
Message 6
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Steve,
What? No pictures? I have never seen a mangled iPad before. ;0)
Congrats on the work that you did get finished. One more small step and youve got
it. Piece of cake!
--------
Semper Fi,
Terry Hand
Athens, GA
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=477116#477116
Message 7
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Message 8
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Pic 2
On Jan 5, 2018 11:47 PM, "Steven Dortch" <steven.d.dortch@gmail.com> wrote:
> Pics
>
> On Jan 5, 2018 6:03 PM, "jarheadpilot82" <jarheadpilot82@hotmail.com>
> wrote:
>
>> jarheadpilot82@hotmail.com>
>>
>> Steve,
>>
>> What? No pictures? I have never seen a mangled iPad before. ;0)
>>
>> Congrats on the work that you did get finished. One more small step and
>> you=99ve got it. Piece of cake!
>>
>> --------
>> Semper Fi,
>>
>> Terry Hand
>> Athens, GA
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=477116#477116
>>
>>
>>
>>
>>
>>
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