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john(at)roadmapscoaching.
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 Posted: Wed Jun 04, 2008 5:31 am Post subject: J Channel & Bulkheads |
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I have had an interesting comment by both an A&P and and RV6 builder while looking over my plane. They pointed out that in the tailcone the edges of the J channels touch the bulkhead cutouts. They were concerned that the contact under vibration could create a crack in the bulkheads. They both suggested that I bend the J channel edges down to prevent the contact. This seems like a lot of work (especially in the tight tailcone). I am wondering if anyone else has been concerned about this or has bothered to bend J channels. Is there a building standard about contact between parts like this?
John Testement
jwt(at)roadmapscoaching.com (jwt(at)roadmapscoaching.com)
40321
Richmond, VA
Painting and final assembly
[img]cid:201144612(at)04062008-1D50[/img]
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pitts_pilot(at)bellsouth.
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| Posted: Wed Jun 04, 2008 6:14 am Post subject: J Channel & Bulkheads |
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That's a tough one! In my mind (may not be a good thing  ) any wear will become an 'interference fit' and won't be sharp-edged. The wear pattern would be smooth, like a fine file. and wouldn't be a source of stress cracks. If there was pressure to the face of the bulkhead, then I may see it a little differently. A little, little differently. Your buddy has good eyes, though!!!
Linn YMMV
do not archive
John Testement wrote: [quote] I have had an interesting comment by both an A&P and and RV6 builder while looking over my plane. They pointed out that in the tailcone the edges of the J channels touch the bulkhead cutouts. They were concerned that the contact under vibration could create a crack in the bulkheads. They both suggested that I bend the J channel edges down to prevent the contact. This seems like a lot of work (especially in the tight tailcone). I am wondering if anyone else has been concerned about this or has bothered to bend J channels. Is there a building standard about contact between parts like this?
John Testement
jwt(at)roadmapscoaching.com (jwt(at)roadmapscoaching.com)
40321
Richmond, VA
Painting and final assembly
[b]
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seipel(at)seznam.cz
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| Posted: Wed Jun 04, 2008 6:38 am Post subject: J Channel & Bulkheads |
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I noticed it during construction and filed the holes in the bulkheads a
little bigger so they didn't touch. Not sure if it is/was necessary though.
PJ Seipel
RV-10 #40032
John Testement wrote:
| Quote: | I have had an interesting comment by both an A&P and and RV6 builder
while looking over my plane. They pointed out that in the tailcone the
edges of the J channels touch the bulkhead cutouts. They were
concerned that the contact under vibration could create a crack in the
bulkheads. They both suggested that I bend the J channel edges down to
prevent the contact. This seems like a lot of work (especially in the
tight tailcone). I am wondering if anyone else has been concerned
about this or has bothered to bend J channels. Is there a building
standard about contact between parts like this?
John Testement
jwt(at)roadmapscoaching.com <mailto:jwt(at)roadmapscoaching.com>
40321
Richmond, VA
Painting and final assembly
Checked by AVG.
6/3/2008 7:00 AM
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Tim Olson
Joined: 25 Jan 2007
Posts: 2879
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| Posted: Wed Jun 04, 2008 3:50 pm Post subject: J Channel & Bulkheads |
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If you bend the J-channel, it will lose strength. The best way to
fix it is to file some gap into the bulkhead cutouts and then deburr
it. Yes, it's a lot of work, but the person/people who told you they
were worried about cracking are correct. Letting things "wear in"
just isn't right.
Tim Olson - RV-10 N104CD - Flying
do not archive
John Testement wrote:
| Quote: | I have had an interesting comment by both an A&P and and RV6 builder
while looking over my plane. They pointed out that in the tailcone the
edges of the J channels touch the bulkhead cutouts. They were concerned
that the contact under vibration could create a crack in the bulkheads.
They both suggested that I bend the J channel edges down to prevent the
contact. This seems like a lot of work (especially in the tight
tailcone). I am wondering if anyone else has been concerned about this
or has bothered to bend J channels. Is there a building standard about
contact between parts like this?
John Testement
jwt(at)roadmapscoaching.com <mailto:jwt(at)roadmapscoaching.com>
40321
Richmond, VA
Painting and final assembly
Checked by AVG.
6/3/2008 7:00 AM
------------------------------------------------------------------------
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toaster73(at)embarqmail.c
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| Posted: Thu Jun 05, 2008 2:51 pm Post subject: J Channel & Bulkheads |
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I'd second that. I found numerous instances of this contact. I even tested
it on a scrap piece by running it back and forth. Al to Al can produce an
edge on either piece bulkead or channel. I sometimes bent the channel just
enough to clear parts if it was only slight or I filed the bulkhead cutout
back some (rounded it out.).
In a couple instances I filed the edge of the j-channel down a little in a
clean large radius fashion. I saw this contact on the wings too.
To me over time the contact would fret and create a groove the width of the
j-channel stock. I was not comfortable with such a small radius groove.
-Chris Lucas
#40072 (home made overhead console mold and wiring)
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