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thesupe(at)hotmail.com
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 Posted: Wed Jul 23, 2008 11:52 am Post subject: corrosion proofing wing spars questions |
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Hi all C I'm just wondering what I should do about the wing spars C I did look in the archives C not a lot of info that I found. There were some posts about sloshing the insides C although it seems some thought it didn't need to be done. I'm wondering about inside and outside. I didn't run accross anything in the manual about it. What do you think? I'm ready to drop the tanks into the wings now. Thanks C Jim Chuk Kitfox 4 Mn | Quote: |
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michaega(at)verizon.net
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| Posted: Wed Jul 23, 2008 1:43 pm Post subject: corrosion proofing wing spars questions |
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Jim,
My kitfox 7 (June 2002) manual gives this information; If you plan on using your Kitfox on floats or live near coastal areas where corrosion may be high then coat the inside of the spar with Alodine and then Epoxy Chomate to protect. Stuff a tennis ball in one end to slosh around to get the mess all over you and the garage floor. Hopefully you won't need to do this or maybe someone has something easier.
George
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n85ae
Joined: 14 Mar 2007
Posts: 403
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| Posted: Wed Jul 23, 2008 1:46 pm Post subject: Re: corrosion proofing wing spars questions |
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The simplest thing to do would be to get some long term corrosion
protective like CRC Corrosion Shell which will dry into a brown
waxy film and shoot that into the spars.
Or slosh with some Zinc Chromate, which is probably the best. It
is MEK soluble, but that's not an issue since you won't be putting
fabric on the spars.
Some people slosh with Epoxy primer, but that's not really necessary.
The spars are 6061, and I have some test scraps of 6061 that have been
weathering outside on the fence since I built mine 6 years ago, and they
show no signs of corrosion at all. So you could simply do nothing.
On my new airplane I'm building I use a waterborne corrosion protective
Cortec 373 which would be ideal to slosh the spars with, but it's hard
to find. You could get it from www.zenithaircraft.com. A quart would be
plenty, and it can be thinned 50/50 with alcohol. It creates a corrosion
inhibiting vapor, and is pretty nice stuff to use. It dries clear and feels like
you have a coat of plastic on what you coat with it.
If you're wings aren't fabric'd yet I'd probably be inclined to slosh with
Zinc Chromate, or Corte 373. Mainly because of the dissimilar corrosion
issue with the rivets the spar attach points use.
Regards,
Jeff
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jlfernan
Joined: 10 Jun 2006
Posts: 51
Location: MIAMI
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| Posted: Wed Jul 23, 2008 4:25 pm Post subject: Re: corrosion proofing wing spars questions |
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I'm getting the quickbuild wings. Any suggestion on how to "slosh" zinc chromate around without damaging the wings or killing yourself?
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Jorge Fernandez
Supersport
Fuselage/Forward Controls
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lcfitt(at)sbcglobal.net
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| Posted: Wed Jul 23, 2008 5:27 pm Post subject: corrosion proofing wing spars questions |
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Jorge,
The tennis ball slosh idea came out on the list after I did mine. The best
I could come up with was a wad of shearling lamb on a string. I stood the
wings on end and dropped the weighted string down the spar - twice, once on
each side of the I beam - and after saturating the lambs wool with the
primer pulled it through. Actually, I think I did it from each end twice.
A bit of plastic on the floor kept things pretty clean.
An electrician's fish tape or a long piece of wire would work as well.
Lowell
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n85ae
Joined: 14 Mar 2007
Posts: 403
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| Posted: Wed Jul 23, 2008 8:00 pm Post subject: Re: corrosion proofing wing spars questions |
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Simple cap the ends pour it in rock & roll the wings. slop the stuff all
over and you're done. Trust me, by the time you get done fabric
covering (if you use the polyfiber system), you concerns about
toxic chemicals will long be past. 
This stuff is not so scary, just where gloves, and a mask if you're
worried. The worst with the zinc chromate is in aerosol form, which
will not be a problem in this case. The smell is mostly MEK and a
few other solvents, and they won't kill you if you don't concentrate
the stuff and breathe it.
I prep aluminum parts for riveting with it all the time with a brush,
you just do it in a well ventilated area and keep it off your skin. No big
deal.
Of course I was out in the garage acetylene welding in a tee shirt, shorts
and a pair of crocs the other night without gloves, so maybe I'm not
the best advisor...
Regards,
Jeff
| Quote: | I'm getting the quickbuild wings. Any suggestion on how to "slosh" zinc chromate around without damaging the wings or killing yourself?
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pwmac(at)sisna.com
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| Posted: Wed Jul 23, 2008 8:23 pm Post subject: corrosion proofing wing spars questions |
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Takes 2 guys . Many of us have done it. Each guy raise and lower his
end and rotate the wing in unison. No big deal at all.
Paul
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At 06:25 PM 7/23/2008, you wrote:
| Quote: |
I'm getting the quickbuild wings. Any suggestion on how to "slosh"
zinc chromate around without damaging the wings or killing yourself?
--------
Jorge Fernandez
Supersport
Waiting on delivery
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=194636#194636
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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
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| Posted: Thu Jul 24, 2008 6:35 am Post subject: corrosion proofing wing spars questions |
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There is also a product called "Invisible Gloves #1211" that can be
rubbed on your hands. The label on my container is almost worn out,
but I can still almost make out "Sun Magic International..." There
is a NSN #6850-01-416-8443 on the container. I got it with some model
airplane stuff from Stits a few years back. In the video that I
followed for covering my models, it said to rub the Invisible Gloves
on your hands and "you can almost wash your hands in MEK without
concern." This video went ot great lengths to warn against breathing
the stuff (MEK), so to say you could almost wash in MEK is giving
this Glove stuff" a pretty good report.
Thanks to this thread, I just looked for and found my can of the
stuff, and because I'm touching up some hangar rash on my 'fox, I'll
be using it again.
Lynn Matteson
Kitfox IV Speedster
Jabiru 2200
Status: flying w/550+ hrs
On Jul 24, 2008, at 12:00 AM, n85ae wrote:
| Quote: | The smell is mostly MEK and a
few other solvents, and they won't kill you if you don't concentrate
the stuff and breathe it.
I prep aluminum parts for riveting with it all the time with a brush,
you just do it in a well ventilated area and keep it off your skin.
No big
deal.
Of course I was out in the garage acetylene welding in a tee shirt,
shorts
and a pair of crocs the other night without gloves, so maybe I'm not
the best advisor...
Regards,
Jeff
> I'm getting the quickbuild wings. Any suggestion on how to "slosh"
> zinc chromate around without damaging the wings or killing yourself?
>
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=194660#194660
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Lynn
Kitfox IV-Jabiru 2200
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FlyboyTR
Joined: 04 Nov 2006
Posts: 215
Location: Mobile, Alabama
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| Posted: Fri Jul 25, 2008 6:09 am Post subject: Re: corrosion proofing wing spars questions |
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Just a side note about MEK. Always....ALWAYS...wear eye protection when mixing, pouring, stirring, etc. One drop has the potential to destroy your vision. Acetone, lacquer thinner, etc will make your eyes burn and hurt for a day or two...but MEK will make you blind!
Travis
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Travis Rayner
Mobile, AL
Skystar Vixen, N-789DF
Continental IO-240, Prince P-Tip Prop
ADI-II Autopilot
AnyWhereMap Navigation with weather
www.enotam.net (My Flying Info Website) |
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