Today's Message Index:
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1. 09:06 PM - Re: Ground Question (Robert L. Nuckolls, III)
2. 09:06 PM - Re: Single shunt for two alternators? (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: Ground Question |
At 03:54 PM 9/16/2010, you wrote:
>Hi all,
>
>I was re-reading the aeroelectric section on grounding the other day
>and was left with a question. I am building an RV 8, rear mounted
>battery. I have grounded the battery to a longeron locally. I plan
>to put a brass bolt through the firewall, bring the engine ground
>strap to that and the forest of tabs ground on the other side. I
>got to wondering if the electrical connection of the firewall to the
>longeron is going to sufficiently ground the battery. Has this been
>the standard arrangement for everyone with a rear mounted, locally
>grounded battery?
Yes, that's no problem . . .
http://aeroelectric.com/Pictures/Batteries/Battery_Install_OBrien_1.jpg
http://aeroelectric.com/Pictures/Batteries/Battery_Install_OBrien_2.jpg
http://aeroelectric.com/Pictures/Batteries/Battery_Install_OBrien_3.jpg
Bob . . .
Message 2
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| Subject: | Re: Single shunt for two alternators? |
>Bob and Gang,
>
>I'm building an RV-7A using with an Advanced Flight System (AFS)
>Advanced Deck 4500s. The 4500s supports a single shunt and has the
>option for a hall effect transducer to read the output of a second
>alternator. AFS recommends mounting the hall effect transducer on
>the cabin side of the firewall and that means bringing the B-lead of
>one alternator through the firewall.
My bad. I thought we were talking ONE current
measurement channel using a hall sensor. If
you can accommodate BOTH a shunt for
one alternator and a hall sensor for a second
alternator then there's no problem for
potential ambiguity of the display . . . I presume
each alternator has its own display.
The hall sensors generally live quite well
under the cowl. We do it all the time on the
TC aircraft. I can't imagine that AFS would
choose an extra-ordinarily fragile device.
Bob . . .
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