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Z13 / 8 Revisions - I've Been Gone

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Paul Valovich

Joined: 11 Jan 2006
Posts: 75

Posted: Tue Mar 03, 2009 8:41 am Post subject: Z13 / 8 Revisions - I've Been Gone

Bob,  

I wired my yet-to-fly RV-8A according to previous Z 13 architectures. Still have some final tweaking to do – mainly involving lighting. For the past 9 months or so I have been doing other “stuff” on the airplane and have not paid much attention to ‘tron postings. However, I did download the latest Z diagrams and a quick comparison shows a relay between the battery and E-buses vice just a switch.  

   

I’m sure there have been discussions and postings regarding this change, but I can’t seem to find them. Can you (again) provide a short summary regarding the logic for this change – and I guess more importantly, the dangers / disadvantages of maintaining the previous wiring scheme? I was pretty happy with the previous E-bus logic. Have you discovered some sneak circuit that will turn my wiring into a smoking mass of non-functionality?  

   

Changing things after the fact may or may not be easy – it’s just not something that mentally appeals to me right now. Canopy / cowl wars have been giving me as much fun as I can stand.  

Paul Valovich  

N192NM Reserved (again)   

      [quote][b]

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nuckolls.bob(at)aeroelect
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Posted: Tue Mar 03, 2009 3:56 pm Post subject: Z13 / 8 Revisions - I've Been Gone

At 10:39 AM 3/3/2009, you wrote:

 	  Quote: 	
		  Bob,

I wired my yet-to-fly RV-8A according to 

previous Z 13 architectures. Still have some 

final tweaking to do – mainly involving 

lighting. For the past 9 months or so I have 

been doing other “stuff” on the airplane and 

have not paid much attention to ‘tron postings. 

However, I did download the latest Z diagrams 

and a quick comparison shows a relay between the 

battery and E-buses vice just a switch.


	


   The original incarnation of the e-bus had a design

   goal of using up fuel aboard in a battery only

   scenario. When major flight instruments were still

   vacuum powered, the notion of getting your electro-

   whizzy loads down to 3 amps or so wasn't an

   unreasonable thing to contemplate.



   The 3A e-bus was easily powered up through a long

   feeder from the always hot battery bus through

   a 5A or so fuse. When Z-13/8 came along, the e-bus

   loads of 8A or more could be supported . . . even

   say 10-11 amps by using the alternator + battery

   combined.



   This pushed the long, always hot feeder to current

   levels that made a flying fuzz uncomfortable . . .

   traditionally, we've tried to keep always hot long

   wires protected at 5A or below.



   Hence the addition of Z-32, Heavy-Duty E-Bus Feed

   which has been incorporated into the present version

   of Z-13/8 as well. If your ebus loads are under 5A

   or if you choose not to embrace the traditional

   design goals, then you can leave the relay out and

   simply wire and fuse your E-bus alternate feed wire

   as necessary to support whatever loads you've

   settled on.

        Bob . . .



        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

        ----------------------------------------

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