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Allen Fulmer
Joined: 10 Jan 2006
Posts: 79
Location: Alexander City, AL
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 Posted: Wed Sep 26, 2007 8:38 pm Post subject: Rear-Battery version of Z-19 |
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Bob,
On the Eggenfellner Subaru the starter contactor is on the starter. Should
I run the fat wire from the aft mounted battery contactor through the
firewall to the starter contactor or maybe stop at an insulated bus bar on
the cockpit side of the firewall and branch from there to starter contactor
and the main bus?
I am concerned that an engine fire might take out the fat wire and thus the
main bus.
Of course I guess that is no more catastrophic than any other cause of power
supply failure to the main bus?
Also, should I place an ANL current limiter between the output of the
battery contactor(s) and the fat wire going forward? Z19-RB does not show
any protection for the fat wire. Or is none needed and if so, why not?
Thanks,
Allen Fulmer
RV7 Subaru H6 turbo
Alexander City, AL
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_________________
RV7 QB Fuselage
Eggenfellner H6 on orde
N808AF reserved
Alexander City, AL |
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nuckolls.bob(at)cox.net
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| Posted: Thu Sep 27, 2007 1:23 pm Post subject: Rear-Battery version of Z-19 |
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At 10:49 PM 9/26/2007 -0500, you wrote:
| Quote: |
Bob,
On the Eggenfellner Subaru the starter contactor is on the starter. Should
I run the fat wire from the aft mounted battery contactor through the
firewall to the starter contactor or maybe stop at an insulated bus bar on
the cockpit side of the firewall and branch from there to starter contactor
and the main bus?
|
Your choice . . . you could tie the alternator b-lead feed to the
starter have only one wire to bring through to contactor behind
the firewall.
| Quote: | I am concerned that an engine fire might take out the fat wire and thus the
main bus.
Of course I guess that is no more catastrophic than any other cause of power
supply failure to the main bus?
|
If you have an engine fire, I suspect that loss of electrical
power is the least of your concerns. In fact, with any detected
fire, I'd be tempted to turn all the power off anyhow.
| Quote: | Also, should I place an ANL current limiter between the output of the
battery contactor(s) and the fat wire going forward? Z19-RB does not show
any protection for the fat wire. Or is none needed and if so, why not?
|
Wire as shown. FAT wires are not generally needing "protection"
in light aircraft and there have been no incidents that suggest
such protection needs to be added. See:
http://www.flightsimaviation.com/data/FARS/part_23-1357.html
. . . the fat wires for battery to starter and battery to
distribution bus fall into categories (1) and (2). This is
why you will not find the protection you've suggested in
about a 250,000 aircraft manufactured since 1945.
Bob. . .
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