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bvthomas(at)bigpond.com
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 Posted: Wed Aug 09, 2006 1:03 am Post subject: 701 Oil Canning Stiffeners701 Oil Canning Stiffeners |
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Hi Dave,
I added diagonal "L" stiffeners in each panel on0 the sides and top & bottom of my 701. A noticable improvement in the0 oil canning dept.howeven I then added a wire brace across and vertically in each0 section and twisted them to the point that they just applied0 inwards pressure on the panels, this eliminated the dreaded oil can problem, simple and light.
Regards Bruce Thomas
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Tommy Walker
Joined: 12 Jan 2006
Posts: 442
Location: Anniston, AL 36207
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| Posted: Wed Aug 09, 2006 3:50 pm Post subject: Re: 701 Oil Canning Stiffeners701 Oil Canning Stiffeners |
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Bruce do you have any pictures of the wire braces?
Thanks,
Tommy Walker in Alabama
Do Not Archive
| bvthomas(at)bigpond.com wrote: | Hi Dave,
I added diagonal "L" stiffeners in each panel on0 the sides and top & bottom of my 701. A noticable improvement in the0 oil canning dept.howeven I then added a wire brace across and vertically in each0 section and twisted them to the point that they just applied0 inwards pressure on the panels, this eliminated the dreaded oil can problem, simple and light.
Regards Bruce Thomas |
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_________________
Tommy Walker
N25A - Anniston, AL |
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n4546v(at)mindspring.com
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| Posted: Thu Aug 10, 2006 8:05 pm Post subject: 701 Oil Canning Stiffeners701 Oil Canning Stiffeners |
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Hello Tommy:
Here are a couple of more ways of looking at anti-oil-canning braces.
The first thing I did was to go out to the TAPCO brake with some of my
extensive .016 scrap inventory and bent up some really nice "Z" sections
which I then installed diagonally on the fuselage sides, bottom & top,
between the verticals. Since it was non-structural, I used #3 solid rivets
(cheaper) rather than Avex. This is shown in the attached picture before
riveting. I then proudly posted my results to the list and was immediately
talked out of using my newly formed "Z". I believe it was Chuck D who
advised that by using "L" rather than "Z", after installation, one could
make a trip back into the fuselage with their fluting pliers and slightly
flute the "L" which very gently "curves" each fuselage section outward,
thereby putting a bit of tension at each station. I thought this was
excellent advice, so much so that I scrapped all my newly formed "Z" and
made another trip to the brake with more .016 material from my extensive
stock of previously destroyed parts and formed the "L" section which is
shown in the photo. As this is non-structural, and as a "scrap-builder", I
used .016 material to save weight. Kit builders could easily use the
furnished .025 standard "L". I think the fluting operation has great value
and eliminates stringing wires across the rear fuse.
Best Regards,
Randy L. Thwing, Las Vegas
| Quote: | Bruce do you have any pictures of the wire braces?
Thanks,
Tommy Walker in Alabama
Do Not Archive
bvthomas(at)bigpond.com wrote:
> Hi Dave,
> I added diagonal "L" stiffeners in each panel on0 the sides and top &
bottom of my 701.
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jean-paul.roy4(at)tlb.sym
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| Posted: Fri Aug 11, 2006 3:27 am Post subject: 701 Oil Canning Stiffeners701 Oil Canning Stiffeners |
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Hello Randy, could you tell me what model of Tapco brake you have?
Thanks
Jean-Paul
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n4546v(at)mindspring.com
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| Posted: Fri Aug 11, 2006 7:29 am Post subject: 701 Oil Canning Stiffeners701 Oil Canning Stiffeners |
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I think it's a "pro-14", It's ten feet long and rated for .032 Al max.
They make one (pro-14 HD) that's rated for .040 Al. You have to build up
the nose for the proper ZA radius, see my pic. I bent all parts for the 701
EXCEPT the .040 longerons. The web site shows what are probably improved
models over mine which I bought used locally. When you go to the site,
there are links to download pdf manuals for each model. I have since bought
a Roper-Whitney 8' shop brake rated for .062 steel so I can bend all but the
gear. I still use the Tapco for most "thin" jobs as the nose is permanently
set up for the ZA radius and it works fine.
http://www.tapcotools.com/pro14.php
Regards,
Randy L. Thwing, Las Vegas
| Quote: | Hello Randy, could you tell me what model of Tapco brake you have?
Thanks
Jean-Paul
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cffd(at)pgrb.com
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| Posted: Fri Aug 11, 2006 8:05 am Post subject: 701 Oil Canning Stiffeners701 Oil Canning Stiffeners |
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Randy and Tommy,
Not only did I flute the .016 diagonal stiffeners I also fluted the
horizontal and vertical
.025 "L's" that make up the frames in the rear fuselage. Seems to work
fine.
Chuck D.
N701TX
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jean-paul.roy4(at)tlb.sym
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| Posted: Fri Aug 11, 2006 9:12 am Post subject: 701 Oil Canning Stiffeners701 Oil Canning Stiffeners |
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Thanks for the info
Regards
Jean-Paul
do not archive
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