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                           AeroElectric-List Digest Archive
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                     Total Messages Posted Fri 09/17/10: 2
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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  _____________________________________


Time: 09:06:46 PM PST US
From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
Subject: Re: AeroElectric-List: 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  _____________________________________


Time: 09:06:49 PM PST US
From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
Subject: Re: AeroElectric-List: 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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