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Panel grounding

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benjamin.fremond(at)wanad
Guest

Posted: Sun Apr 09, 2006 3:06 am Post subject: Panel grounding

Hi all,



I build a Dyn'Aero MCR Sportster kit : this is a two seats carbon epoxy 

aircraft inspired from Michel Colomban's Bambi. It is Rotax 912 powered, 

and Z-16 wired. First flight expected in a few weeks ! Two years ago, 

before reading "The AeroElectric Connection" and subscribing to this list, 

I would never have thought of wiring it myself. And this is done ! And for 

the moment, in my garage, everything works well ! Many, many thanks to Bob 

Nuckolls and all the contributors of the list !

In this aircraft, the aluminium panel is electrically isolated from the 

airframe, due to the rubber shock-mounts and the composite structure.



I don't know whether the cases of  my VHF (Microair M760), transponder 

(Filser TRT600) and intercom (Flightcom 403 mc) are all internally grounded 

or not (to the avionics ground bus, via their respective D-sub connectors 

and harnesses) but if only one does, the panel itself is actually grounded 

too, via its case, and possibly tiny internal connections.



Is it then mandatory (or facultative) to add a big wire between the panel 

and the forest-of-ground-tabs ? My concerns are, in this order, security, 

protection of  expensive avionics and noise.



Any advice appreciated.



Thanks,



Benjamin Fremond

Rennes, France

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nuckollsr(at)cox.net
Guest

Posted: Sun Apr 09, 2006 12:11 pm Post subject: Panel grounding

At 01:09 PM 4/9/2006 +0200, you wrote:



 	  Quote: 	
		  

=?iso-8859-1?Q?Fr=E9mond?= <benjamin.fremond(at)wanadoo.fr>



Hi all,



I build a Dyn'Aero MCR Sportster kit : this is a two seats carbon epoxy

aircraft inspired from Michel Colomban's Bambi. It is Rotax 912 powered,

and Z-16 wired. First flight expected in a few weeks ! Two years ago,

before reading "The AeroElectric Connection" and subscribing to this list,

I would never have thought of wiring it myself. And this is done ! And for

the moment, in my garage, everything works well ! Many, many thanks to Bob

Nuckolls and all the contributors of the list !

In this aircraft, the aluminium panel is electrically isolated from the

airframe, due to the rubber shock-mounts and the composite structure.



I don't know whether the cases of  my VHF (Microair M760), transponder

(Filser TRT600) and intercom (Flightcom 403 mc) are all internally grounded

or not (to the avionics ground bus, via their respective D-sub connectors

and harnesses) but if only one does, the panel itself is actually grounded

too, via its case, and possibly tiny internal connections.



Is it then mandatory (or facultative) to add a big wire between the panel

and the forest-of-ground-tabs ? My concerns are, in this order, security,

protection of  expensive avionics and noise.


	




     If you never grounded it, as long as all other grounds get back

     to the single point firewall ground, you're not likely to perceive

     any problems with respect to noise or other functionality. However,

     as a matter of practice in big airplanes, we BOND large hunks of

     'floating' metal to heavier ground structures, mostly for lightning

     stroke issues. It's a toss up. Of course one never expects to get

     hit by the big one but when and if it does happen - See:



http://aeroelectric.com/articles/Anatomy_of_a_Lightning_Strike.pdf



     Then likelihood of your electronics surviving (or at least

     mitigating damage) goes up if you put a hefty ground conductor

     from panel to firewal. I'd suggest a 10AWG with its own bolt

     on the panel and a ring terminal on the other end to take it

     to the 5/16 brass firewall passthru bolt.



     The fact that all other grounds go to this same point means

     that you'll have no ground-loop generated noises in spite of

     the fact that multiple systems share common grounds at both

     ends (panel and firewall).



     Bob . . .

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