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n7cr(at)bellsouth.net
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 Posted: Sat Mar 25, 2006 5:37 pm Post subject: Cortec 373 and airframe ground continuity |
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Has anyone using Cortec 373 primer had any problems with high airframe ground
resistance or intermittent grounding?
Cortec being a plastic (insulator), doesn't it electrically isolate each side of
the metal joint if applied between the two halves, with ground continuity
relying on the rivets and scratches/imperfections in the primer?
I'm getting ready to close up the first wing on my 701 kit and in the process of
installing the strobe box and fuel tank grounding got to thinking about this. I
scraped away the layer of primer at the grounding points but then realized all
the ribs and channels may be electrically isolated from each other. This could
make for noisy radio comms or odd electrical faults in the future.
Any comments?
Rory
Lacombe, LA
CH701 Working on wings
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Tim Juhl
Joined: 21 Mar 2006
Posts: 488
Location: "Thumb" of Michigan
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| Posted: Sat Mar 25, 2006 6:11 pm Post subject: Re: Cortec 373 and airframe ground continuity |
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Just my opinion, but since all the metal pieces in a Zenith are held together by numerous rivets, I would think they are very well grounded.
If you are concerned, you can always run a separate ground wire to a central grounding point but I think it would be unnecessary.
If possible, I would use shielded wire to carry the +12 volts to the strobe units (making sure the shielding is grounded.) I have had problems with strobes generating radio noise. Also, keep the antenna coax away from power wires when possible.
Tim
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Champ L16A flying
Zodiac XL - Jabiru 3300A
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gfmjr_20(at)hotmail.com
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| Posted: Sun Mar 26, 2006 4:04 am Post subject: Cortec 373 and airframe ground continuity |
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Rory
No problems on my plane with use or cortex. I insure at all termiinations
that
the cortex is removed to insure good electrical contact and have run all
grounds where practical to a common point.
George May
601XL 912s
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pacificpainting(at)comcas
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| Posted: Sun Mar 26, 2006 7:31 am Post subject: Cortec 373 and airframe ground continuity |
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What exactly is Cortec 373? Is it primer? I just use self etching primer
for aluminum.
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