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Rear-Battery version of Z-19

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Allen Fulmer

Joined: 10 Jan 2006
Posts: 79
Location: Alexander City, AL

Posted: Wed Sep 26, 2007 8:38 pm Post subject: Rear-Battery version of Z-19

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

nuckolls.bob(at)cox.net
Guest

Posted: Thu Sep 27, 2007 1:23 pm Post subject: Rear-Battery version of Z-19

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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