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nuckolls.bob(at)aeroelect
Guest

Posted: Mon Mar 01, 2010 5:05 am Post subject: Z8

At 08:02 PM 2/28/2010, you wrote:

  	  Quote: 	
		   Bob:

  

 Is it going to have 2 LR-3's or an LR-3/SB-1 combination?  What's the timeframe before we get a peek? 	


    I'm deliberating the ease with which a pair

    of IR alternators can be incorporated into a

    dual battery, dual alternator, three bus system.

    

    The design goal embraces legacy protocols for

    having all fat wires "cold" with switches OFF

    and no always hot wires fused at over 7A. The

    IR alternator crowbar OV (and ultimately 9011)

    integration calls for a b-lead contactor. If

    this contactor were mounted next to a battery

    contactor it could tie an alternator to the battery

    side of the battery contactor instead of the bus

    side. 



    The simplest system would utilize two IR alternators

    of any size. Adding external regulators wouldn't

    drive up complexity much.



    The architecture offers two battery busses

    supported directly by their respective alternators.

    Each would be operable independently of the other

    and of the main bus. No e-bus is needed. I've

    about got the drawing done but I'll be out of

    town today. Might get it posted late tonight.



    Bob . . .    [quote][b]

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Noah

Joined: 02 Jul 2009
Posts: 18
Location: Rhode Island

Posted: Wed Mar 03, 2010 12:10 pm Post subject: Re: Z8

Two questions regarding Z-8.



1. I assume this "new" Z-8 is different from the Z-8 published in 1999 in your document "All Electric Airplane on a Budget" at:

http://www.matronics.com/aeroelectric/articles/allelect.pdf

If this is the case, why not give the new Z-8 a new name to eliminate confusion?



2. What is the minimum practical battery capacity that would be recommended in a system as described above, on the bus with the smaller alternator (SD-20 in my case)?  I am not asking from a battery-only loads & endurance standpoint, but rather from a battery-as-an-alternator-reservoir/voltage-stabilizer standpoint.



I am loathe to install a second battery, contactor, and additional components when I think my requirements are met without them, but I will certainly have a long hard look at what is proposed and do some soul searching.



Part of my question stems from the fact that my 16 A-Hr battery is already pretty much integrated into my platform.

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_________________
Highest Regards,

Noah Forden
RV-7A
Rhode Island

nuckolls.bob(at)aeroelect
Guest

Posted: Wed Mar 03, 2010 4:46 pm Post subject: Z8

At 02:10 PM 3/3/2010, you wrote:

 	  Quote: 	
		  



Two questions regarding Z-8.



1. I assume this "new" Z-8 is different from the Z-8 published in 

1999 in your document "All Electric Airplane on a Budget" at:

http://www.matronics.com/aeroelectric/articles/allelect.pdf

If this is the case, why not give the new Z-8 a new name to 

eliminate confusion?


	


    Many moons ago, the z-figures went from Z-1 to 10 and somewhere

    around revision 8 or 9 were replaced with Z-11 and on as they

    were redrawn to be more consistent with each other. The suite

    of drawings was extended upward from Z-11.  It was my plan

    at some time to fill the lower numbers back in later. Z-8

    was the predecessor to Z-13/8. It only appears in the 1999

    article and very old issues of the 'Connection which should

    have been updated several times over.

 	  Quote: 	
		  2. What is the minimum practical battery capacity that would be 

recommended in a system as described above, on the bus with the 

smaller alternator (SD-20 in my case)?  I am not asking from a 

battery-only loads & endurance standpoint, but rather from a 

battery-as-an-alternator-reservoir/voltage-stabilizer standpoint.


	


    Technically, any size battery is adequate to the task

    of tickling an alternator to life. Batteries are of little

    value in noise abatement or voltage stabilization.

    Further, the smaller they get, the more they suffer

    the 'abuse' of short but heavy charge/discharge

    events. Having offered that, I have no idea what would

    be considered useful to your task. You'll need to put

    some sort of preventative maintenance program on it

    or (ugh!) throw a new one in ever so often. It may

    be that a tiny (6 a.h. or less) battery wouldn't

    support this application for a year . . . I just don't

    know. You can just pick one, check it from time to

    time and see how it goes. There some small products

    by Dekka that feature robust terminals indicative

    of an ability to source/sink the transients.

 	  Quote: 	
		  I am loathe to install a second battery, contactor, and additional 

components when I think my requirements are met without them, but I 

will certainly have a long hard look at what is proposed and do some 

soul searching.


	


    The answer lies not with the soul but with calculated

    and considered assembly of ingredients into a recipe

    for success that meets your design goals.



    The task before you is the same that evolved the

    Z-figures over the years. You can look forward

    a sifting the details in search of the stable

    configuration.



    Bob . . .

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