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Field of grounds with local bat ground

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floridawing

Joined: 10 Dec 2014
Posts: 5

Posted: Wed Dec 31, 2014 11:52 am Post subject: Field of grounds with local bat ground

Hello, I have a HR2. The battery is mounted in the back with a local ground. The engine is grounded to the engine mount with a strap through a engine mount bolt. There is a field of grounds mounted to the firewall. The field of grounds is only receiving its ground through the firewall and no other straps. All my avionics are grounded to this. My question is is the firewall a good enough ground for all the avionics? Thank you.

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voltar(at)vx-aviation.com
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Posted: Thu Jan 01, 2015 8:54 am Post subject: Field of grounds with local bat ground

I have a similar config, except I grounded the engine directly to the firewall using the brake reservoir bolt.  No problems.



I was reluctant to ground to the engine mount due to the remote possibility of increased corrosion of the highly stressed engine mount bolts.



Vern



====



 	  Quote: 	
		   On Dec 31, 2014, at 11:52 AM, floridawing <lb757(at)hotmail.com> wrote:

 

 

 

 Hello, I have a HR2. The battery is mounted in the back with a local ground. The engine is grounded to the engine mount with a strap through a engine mount bolt. There is a field of grounds mounted to the firewall. The field of grounds is only receiving its ground through the firewall and no other straps. All my avionics are grounded to this. My question is is the firewall a good enough ground for all the avionics? Thank you.

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=436461#436461

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ceengland7(at)gmail.com
Guest

Posted: Thu Jan 01, 2015 9:55 am Post subject: Field of grounds with local bat ground

Plus the fact that steel is a relatively poor conductor, and running 

current through it creates at least a mediocre magnet (fun for 

compasses, etc).

Charlie

On 1/1/2015 10:52 AM, Vern Little wrote:

 	  Quote: 	

 I have a similar config, except I grounded the engine directly to the firewall using the brake reservoir bolt.  No problems.

 I was reluctant to ground to the engine mount due to the remote possibility of increased corrosion of the highly stressed engine mount bolts.

 Vern

 ====

> On Dec 31, 2014, at 11:52 AM, floridawing <lb757(at)hotmail.com> wrote:

>

> 

>

> Hello, I have a HR2. The battery is mounted in the back with a local ground. The engine is grounded to the engine mount with a strap through a engine mount bolt. There is a field of grounds mounted to the firewall. The field of grounds is only receiving its ground through the firewall and no other straps. All my avionics are grounded to this. My question is is the firewall a good enough ground for all the avionics? Thank you.

>

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floridawing

Joined: 10 Dec 2014
Posts: 5

Posted: Thu Jan 01, 2015 1:01 pm Post subject: Re: Field of grounds with local bat ground

Thank you Vern and Charlie. Would I be better off adding a second ground strap to the engine and running it up to the field of grounds on the firewall or should I only use the one strap I have but remove the end attached to the engine mount and attach it instead to the field of grounds on the firewall? Thank you!

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jimkale(at)roadrunner.com
Guest

Posted: Thu Jan 01, 2015 5:02 pm Post subject: Field of grounds with local bat ground

Grounds can be tricky on composite or wood airplanes.  It is easy to get

different parts of the airplane with grounds not being well bonded to each

other.  In that case, grounds can have different voltages on them and you

get what is commonly referred to as GROUND LOOPS.  All sorts of funny things

happen to electrical equipment which don't want to operate like they should.

It is extremely difficult to trace the problems.  Be very careful to have

all ground points bonded to each other very well with redundant paths if

possible.  On metal airplanes, grounds are less difficult, but any metal

corrosion can cause the same problems.

--

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tim2542(at)sbcglobal.net
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Posted: Thu Jan 01, 2015 8:51 pm Post subject: Field of grounds with local bat ground

I would add be careful adding additional grounds between the engine case and battery. Any electrical equipment installed on the engine should be grounded to the engine. If you run separate grounds for other equipment and the main engine ground is compromised then your Pmag or whatever will begin to carry the starter and alternator loads. Unless it's sized for that load....smoke.

Tim 



[quote] On Jan 1, 2015, at 5:01 PM, <jimkale(at)roadrunner.com> <jimkale(at)roadrunner.com> wrote:

 

 

 

 Grounds can be tricky on composite or wood airplanes.  It is easy to get

 different parts of the airplane with grounds not being well bonded to each

 other.  In that case, grounds can have different voltages on them and you

 get what is commonly referred to as GROUND LOOPS.  All sorts of funny things

 happen to electrical equipment which don't want to operate like they should.

 It is extremely difficult to trace the problems.  Be very careful to have

 all ground points bonded to each other very well with redundant paths if

 possible.  On metal airplanes, grounds are less difficult, but any metal

 corrosion can cause the same problems.

 

 

 --

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floridawing

Joined: 10 Dec 2014
Posts: 5

Posted: Fri Jan 02, 2015 6:24 am Post subject: Re: Field of grounds with local bat ground

Thank you everyone for the information!

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nuckolls.bob(at)aeroelect
Guest

Posted: Fri Jan 02, 2015 3:51 pm Post subject: Field of grounds with local bat ground

At 19:01 2015-01-01, you wrote:

 	  Quote: 	
		  



Grounds can be tricky on composite or wood airplanes.  It is easy to get

different parts of the airplane with grounds not being well bonded to each

other.  In that case, grounds can have different voltages on them and you

get what is commonly referred to as GROUND LOOPS.  All sorts of funny things

happen to electrical equipment which don't want to operate like they should.

It is extremely difficult to trace the problems.  Be very careful to have

all ground points bonded to each other very well with redundant paths if

possible.  On metal airplanes, grounds are less difficult, but any metal

corrosion can cause the same problems.


	


   Actually, DC POWER grounding in composite airplanes is stone simple.

   See chapter 15 of the 'Connection.



   BONDING for purposes of achieving grounds at radio frequencies

   and issues of LIGHTNING protection are another matter entirely

   . . . usually ignored in OBAM aircraft as physically, economically

   and operationally impractical.  Adding the necessary and useful

   ground plane under comm and xponder antennas is generally

   all that's required . . . also stone simple . . . see

   chapter 13 . . .



   Bob . . .

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jimkale(at)roadrunner.com
Guest

Posted: Fri Jan 02, 2015 6:47 pm Post subject: Field of grounds with local bat ground

It is only STONE SIMPLE if one knows where to get the information, can

understand and apply the information.  Thank you for the reference.



--

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