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Tunnel grounding

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woxofswa

Joined: 12 Aug 2008
Posts: 349
Location: AZ

Posted: Mon May 04, 2009 10:42 am Post subject: Tunnel grounding

Hi guys,



This is my first post on this forum.  I am looking forward to learning at the knees of the braintrust.



I just finished the 'lectric bible and really enjoyed it, (that which I could understand at least).



I am building an RV-10 and have settled for now on the one battery two alternator scheme, and am planning to run a #2 ground wire from the (rear) batt to a forest of grounds at the firewall.

I got started by buying the Van's wiring kit just to get my feet wet.



My specific question for today has to do with grounding items in the center tunnel, specifically, the fuel totalizer, fuel pump, flap actuator, flap position selector, and a flap position sensor (wouldn't it be great if those two could be combined into one geewhiz?)



At any rate, the question that I have on grounding those items is should I:



1.  Ground each locally?

2.  Run a separate ground for each to the front forest?

3.  Run each to a mini forest in the tunnel that has its own ground wire to either the front ground forest or back to the battery?



Thanks in advance.

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_________________
Myron Nelson
Mesa, AZ
Flew May 10 2014

MauleDriver(at)nc.rr.com
Guest

Posted: Mon May 04, 2009 12:20 pm Post subject: Tunnel grounding

Myron, I'm not an expert here but since I'm knee deep in my '10, I 

thought I'd share my thinking and doing at this  point....

- I'm locally (on the tunnel structure) grounding all of the items you 

mentioned except for my GRT fuel flow sensor which is grounded on my 

forest of tabs.  I figure the fuel flow sensor might be sensitive to 

ground issues.

- I have my 2 batteries well grounded to the airframe using the approach 

Bob has documented on his site

http://www.aeroelectric.com/articles/Battery_Grounds/Battery_Grounds.html

- I have a forest of tabs on the firewall but I ran a #8 cable to it.  

Most of my panel is run to it.  I'm depending on the engine being well 

grounded through the airframe for starting so I figure I don't need more 

than a #8.



btw, the FAA's Acceptable Methods has great detail on how to do airframe 

ground connections (lock washers, materials, etc)



Hope some of that helps.



Bill "going to run some wires" Watson

RV10 40605



woxofswa wrote:

 	  Quote: 	
		   



 Hi guys,



 This is my first post on this forum.  I am looking forward to learning at the knees of the braintrust.



 I just finished the 'lectric bible and really enjoyed it, (that which I could understand at least).



 I am building an RV-10 and have settled for now on the one battery two alternator scheme, and am planning to run a #2 ground wire from the (rear) batt to a forest of grounds at the firewall.



 My specific question for today has to do with grounding items in the center tunnel, specifically, the fuel totalizer, fuel pump, flap actuator, flap position selector, and a flap position sensor (wouldn't it be great if those two could be combined into one geewhiz?)



 At any rate, the question that I have on grounding those items is should I:



 1.  Ground each locally?

 2.  Run a separate ground for each to the front forest?

 3.  Run each to a mini forest in the tunnel that has its own ground wire to either the front ground forest or back to the battery?



 Thanks in advance.



 --------

 Myron Nelson

 Mesa, AZ

 Emp completed, legacy build fuse in progress





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p 42685#242685

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woxofswa

Joined: 12 Aug 2008
Posts: 349
Location: AZ

Posted: Fri May 08, 2009 5:05 pm Post subject: Re: Tunnel grounding

Thanks Bill,



I appreciate your suggestions, but I am still hoping that Bob also chimes in before I finish out the tunnel.



Best,

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_________________
Myron Nelson
Mesa, AZ
Flew May 10 2014

nuckolls.bob(at)aeroelect
Guest

Posted: Fri May 08, 2009 9:03 pm Post subject: Tunnel grounding

At 08:05 PM 5/8/2009, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "woxofswa" <woxof(at)aol.com>



 Thanks Bill,



 I appreciate your suggestions, but I am still hoping that Bob also chimes in before I finish out the tunnel.

 	


   I thought I had responded to this but I don't

   find the response on my computer here at home.

   Perhaps I crafted something on a trip machine

   and never got it sent. Anywho . . .



 

 I am building an RV-10 and have settled for now on the one battery two alternator scheme, and am planning to run a #2 ground wire from the (rear) batt to a forest of grounds at the firewall. 



     Not really necessary in an all metal airplane but

     works good . . .



 My specific question for today has to do with grounding items in the center tunnel, specifically, the fuel totalizer, fuel pump, flap actuator, flap position selector, and a flap position sensor (wouldn't it be great if those two could be combined into one geewhiz?) 



 At any rate, the question that I have on grounding those items is should I: 



 1. Ground each locally? 

 2. Run a separate ground for each to the front forest? 

 3. Run each to a mini forest in the tunnel that has its own ground wire to either the front ground forest or back to the battery? 

    

    None of these are especially vulnerable to

    ground loop noises so local grounds will probably

    be fine. The super clean approach is separate

    ground wires for each device to the forest

    of tabs on the firewall.



 

        Bob . . .



        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

        ----------------------------------------



     [quote][b]

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woxofswa

Joined: 12 Aug 2008
Posts: 349
Location: AZ

Posted: Sat May 09, 2009 2:27 pm Post subject: Re: Tunnel grounding

Thanks Bob.



I like super clean.

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_________________
Myron Nelson
Mesa, AZ
Flew May 10 2014

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