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Z-101 schematic question

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heedh23

Joined: 05 Sep 2014
Posts: 4
Location: Washington, USA

Posted: Thu Nov 11, 2021 8:06 am Post subject: Z-101 schematic question

Hi all-



Following the current Z-101 / RV-10 discussion with interest, as I am beginning to plan out my own electrical system.



Two n00b questions for my education-



1.  What is the significance of the ‘B’ in a circle symbol near the aux/engine bus feeder diode, the primary alternator field breaker, and the aux bus relay?  I couldn’t find a definition for that symbol in my copy of the Aeroelectric Connection.



2.  I am currently flying an OBAM SeaRey, which has long battery runs from nose battery to pusher engine, plus a composite hull.  The RV-10 reverses the position of the battery / engine, but has similar long power runs.  I got used to running thick wire through the hull . My question - if the main bus fuse distribution occurs just behind the firewall and the battery is in the rear, why not power the main bus via the heavy gauge wire running from the alternator B lead/starter solenoid back to the hot side of the battery contactor rather than running a separate bus feed from the rear-mounted contactor back to the bus?  I recognize that the weight of the smaller gauge bus power lead is small, and inexpensive, but it seems like a similar optimization is already happening between the starter and B lead.  Merely curious.



Thanks in advance,

-Ed

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Ceengland

Joined: 11 Oct 2020
Posts: 378
Location: MS

Posted: Thu Nov 11, 2021 10:50 am Post subject: Z-101 schematic question

On 11/11/2021 10:07 AM, heedh23 wrote:

 	  Quote: 	
		   



 Hi all-



 Following the current Z-101 / RV-10 discussion with interest, as I am beginning to plan out my own electrical system.



 Two n00b questions for my education-



 1.  What is the significance of the â€˜Bâ€™ in a circle symbol near the aux/engine bus feeder diode, the primary alternator field breaker, and the aux bus relay?  I couldnâ€™t find a definition for that symbol in my copy of the Aeroelectric Connection.



 2.  I am currently flying an OBAM SeaRey, which has long battery runs from nose battery to pusher engine, plus a composite hull.  The RV-10 reverses the position of the battery / engine, but has similar long power runs.  I got used to running thick wire through the hull . My question - if the main bus fuse distribution occurs just behind the firewall and the battery is in the rear, why not power the main bus via the heavy gauge wire running from the alternator B lead/starter solenoid back to the hot side of the battery contactor rather than running a separate bus feed from the rear-mounted contactor back to the bus?  I recognize that the weight of the smaller gauge bus power lead is small, and inexpensive, but it seems like a similar optimization is already happening between the starter and B lead.  Merely curious.



 Thanks in advance,

 -Ed

No clue on the B symbol, but I think you're describing the 'typical' 
	


wiring method for rear bat/firewall main bus. The master contactor is at 

the battery, and the load side wire comes forward to the starter 

solenoid's hot side, and from there it can feed the main bus. Here's an 

old hand drawn 'rear battery' setup that Bob did years ago for the Z14 

diagram. Not the exact thing you're describing, but electrically the 

same, if you eliminate the extra battery & crossfeed contactor.



Charlie

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Charlie

johnbright

Joined: 14 Dec 2011
Posts: 165
Location: Newport News, VA

Posted: Thu Nov 11, 2021 1:24 pm Post subject: Re: Z-101 schematic question

 	  heedh23 wrote: 	
		  ...What is the significance of the ‘B’ in a circle symbol near the aux/engine bus feeder diode, the primary alternator field breaker, and the aux bus relay?...



Thanks in advance,

-Ed 	




The circled Bs are changes at rev B. At rev A there was no diode part number, the aux bus feeder was 18 awg, and the main alternator field was thru 16 awg FLW followed by 12 awg hookup wire to the 5A breaker.



BTW, in former times, Bob used shop-made 22 awg fuse links followed by 18 awg hookup wire. He went to store-bought fuselink wire recently and the smallest available in small quantities is 20 awg.

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_________________
John Bright, RV-6A, at FWF, O-360
Z-101 single batt dual alt SDS EM-5-F.
john_s_bright@yahoo.com, Newport News, Va
N1921R links

heedh23

Joined: 05 Sep 2014
Posts: 4
Location: Washington, USA

Posted: Fri Nov 12, 2021 9:54 am Post subject: Re: Z-101 schematic question

Thanks Charlie and John - that helps a lot.

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