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phapp(at)yhpb.com
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 Posted: Tue Apr 23, 2019 3:54 am Post subject: FOT Hardware |
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Hi,
I have B&C's FOT on my RV-8 firewall. It comes with brass hardware.
However I need a longer bolt for the thickness of the connectors for the standard battery and engine grounds. In AC 43.13-1B (11-76 11-79) I see very specific material types called out for bonding connection hardware.
Question is, do I need to stick with brass or can I go with the standard cadmium plated AN hardware we use everywhere else in our homebuilts? If Bob suggests brass, what's a good supplier?
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Kellym
Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
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| Posted: Tue Apr 23, 2019 4:15 am Post subject: FOT Hardware |
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With large current connectors, such as battery ground and engine ground
you do NOT need to connect to the FOT. Connect to any bolt going through
the firewall and you will be fine. The FOT grounds are for avionics that
are low current, prone to ground loops etc. Your high current
connections are fine using the metal airframe for ground. AN hardware is
also fine for those connections. If you try to stack those large
connectors all together with the bolt going through your FOT you are
asking for something not connecting well. On my RV-10 Vans has the
engine ground using the engine mount firewall bolts as the engine ground
connection. Maybe not ideal, but it works.
On 4/23/2019 4:52 AM, Paul Happ wrote:
| Quote: | Hi,
I have B&C's FOT on my RV-8 firewall. It comes with brass hardware.
However I need a longer bolt for the thickness of the connectors for the
standard battery and engine grounds. In AC 43.13-1B (11-76 11-79) I
see very specific material types called out for bonding connection
hardware.
Question is, do I need to stick with brass or can I go with the
standard cadmium plated AN hardware we use everywhere else in our
homebuilts? If Bob suggests brass, what's a good supplier?
|
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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD |
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ceengland7(at)gmail.com
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| Posted: Tue Apr 23, 2019 4:43 am Post subject: FOT Hardware |
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What diameter are the B&C bolts? I made my own FOT using a brass blank switchplate & tabs from an electronic supplier, and for the bolt, I used a 5/16" brass bolt soldered to the plate. The bolts are available in pairs, complete with brass nuts, from your local hardware store or big box store. You just need to look in an unconventional area to find them. 
https://www.google.com/search?q=toilet+hold+down+bolts&oq=toilet+hold+down+bolts&aqs=chrome.0.0l6.8822j0j7&sourceid=chrome&ie=UTF-8
Charlie
 Virus-free. www.avast.com [url=#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2][/url]
On Tue, Apr 23, 2019 at 6:58 AM Paul Happ <phapp(at)yhpb.com (phapp(at)yhpb.com)> wrote:
| Quote: | Hi,
I have B&C's FOT on my RV-8 firewall. It comes with brass hardware.
However I need a longer bolt for the thickness of the connectors for the standard battery and engine grounds. In AC 43.13-1B (11-76 11-79) I see very specific material types called out for bonding connection hardware.
Question is, do I need to stick with brass or can I go with the standard cadmium plated AN hardware we use everywhere else in our homebuilts? If Bob suggests brass, what's a good supplier?
|
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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kenryan
Joined: 20 Oct 2009
Posts: 426
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| Posted: Tue Apr 23, 2019 7:34 am Post subject: FOT Hardware |
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Please remind me, what is FOT?
On Tue, Apr 23, 2019, 04:20 Kelly McMullen <kellym(at)aviating.com (kellym(at)aviating.com)> wrote:
| Quote: | --> AeroElectric-List message posted by: Kelly McMullen <kellym(at)aviating.com (kellym(at)aviating.com)>
With large current connectors, such as battery ground and engine ground
you do NOT need to connect to the FOT. Connect to any bolt going through
the firewall and you will be fine. The FOT grounds are for avionics that
are low current, prone to ground loops etc. Your high current
connections are fine using the metal airframe for ground. AN hardware is
also fine for those connections. If you try to stack those large
connectors all together with the bolt going through your FOT you are
asking for something not connecting well. On my RV-10 Vans has the
engine ground using the engine mount firewall bolts as the engine ground
connection. Maybe not ideal, but it works.
On 4/23/2019 4:52 AM, Paul Happ wrote:
> Hi,
>
> I have B&C's FOT on my RV-8 firewall. It comes with brass hardware.
>
> However I need a longer bolt for the thickness of the connectors for the
> standard battery and engine grounds. In AC 43.13-1B (11-76 11-79) I
> see very specific material types called out for bonding connection
> hardware.
>
> Question is, do I need to stick with brass or can I go with the
> standard cadmium plated AN hardware we use everywhere else in our
> homebuilts? If Bob suggests brass, what's a good supplier?
>
>
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art(at)zemon.name
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| Posted: Tue Apr 23, 2019 8:50 am Post subject: FOT Hardware |
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forest of tabs
On Tue, Apr 23, 2019 at 10:51 AM Ken Ryan <keninalaska(at)gmail.com (keninalaska(at)gmail.com)> wrote:
| Quote: | Please remind me, what is FOT?
|
--
https://CheerfulCurmudgeon.com/"Love wins. Love always wins." Morrie Schwartz
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bobnoffs
Joined: 04 Jul 2012
Posts: 132
Location: northern wi.
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| Posted: Tue Apr 23, 2019 1:54 pm Post subject: FOT Hardware |
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forest of tabs
On Tue, Apr 23, 2019 at 11:54 AM Art Zemon <art(at)zemon.name (art(at)zemon.name)> wrote:
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