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Drawing Z-13/20

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stickandrudder1(at)comcas
Guest

Posted: Sun Jul 17, 2011 4:45 pm Post subject: Drawing Z-13/20

Bob, just curious.  What was the reason drawing Z-13/20 was omitted from revision 12 of AEC?  

       [quote][b]

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stickandrudder1(at)comcas
Guest

Posted: Mon Jul 18, 2011 7:43 pm Post subject: Drawing Z-13/20

Forget my question (if you haven’t done so already) regarding why Z-13/20 went away with Revision 12 of AEC.  I found my answer.  I’m getting this Matronics Email-Serve thing figured out (i.e. search – Duh!).  You must have the patience of Job, being asked the same question over and over.  

   

That said, I did an analysis of Z-12, and it is quite similar to Z-13/20 with a few notable exceptions.  I have a couple of questions and observations regarding Z-12.  

   

The field for both alternators is fed from the main bus.  If the Aux alternator field was fed from the E-Bus, it would provide battery current should the Battery Contactor Fail (however unlikely), with no apparent downside to the overall design, other than the E-Bus alternate feed would need to be switched on.  Am I reading this right, or is there more to it?  This brings up a more basic question.   

   

What is the intended normal operating position of the E-Bus Alternate Feed Switch?  It would seem that it could be operated in the “On” position (enabled to provide battery power “when” the battery contactor fails) or Off position (requiring it to be turned on “when” the contactor fails).  

   

The Z-12 design powers both the main and E-Bus from both alternators.  Does this assume the pilot will shed load (if necessary) from the main bus necessary to stay below the output of the backup alternator in order to save the battery,  until those devices are required for approach and landing?  

   

Bob, I’m sure you know that when we ask these questions, it’s because (hopefully) we are thinking, which is a good thing.  I’m sure you’re beyond taking challenges/questioning of your designs personally.  I for one really appreciate you taking the time to answer questions and being here to educate.  

   

Thanks  

   

Paul         

   

   

   

   

       [quote][b]

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nuckolls.bob(at)aeroelect
Guest

Posted: Tue Jul 19, 2011 8:13 am Post subject: Drawing Z-13/20

At 10:39 PM 7/18/2011, you wrote:

  	  Quote: 	
		   Forget my question (if you haven’t done so already) regarding why Z-13/20 went away with Revision 12 of AEC.  I found my answer.  I’m getting this Matronics Email-Serve thing figured out (i.e. search – Duh!).  You must have the patience of Job, being asked the same question over and over. 	


    It happens in every classroom semester after semester . . .



  	  Quote: 	
		    

 That said, I did an analysis of Z-12, and it is quite similar to Z-13/20 with a few notable exceptions.  I have a couple of questions and observations regarding Z-12.

  

 The field for both alternators is fed from the main bus.  If the Aux alternator field was fed from the E-Bus, it would provide battery current should the Battery Contactor Fail (however unlikely), with no apparent downside to the overall design, other than the E-Bus alternate feed would need to be switched on.  Am I reading this right, or is there more to it?  This brings up a more basic question. 	


    If the battery contactor fails -AND- you stall

    the alternator -AND- assuming it won't come up

    self-excited only -THEN- are you limited to what

    runs off the e-bus from energy contained in a

    well-maintained battery.



    I'm told that belt driven alternators running at

    10 KRPM will, for the most part, come up self

    excited.



  	  Quote: 	
		    

 What is the intended normal operating position of the E-Bus Alternate Feed Switch?  It would seem that it could be operated in the “On” position (enabled to provide battery power “when” the battery contactor fails) or Off position (requiring it to be turned on “when” the contactor fails). 	


    The original idea was to close the e-bus

    alternate feed during pre-flight to test

    the path (an perhaps get clearance delivery

    and ATIS). Then leave it off for remainder

    of flight.



  	  Quote: 	
		    

 The Z-12 design powers both the main and E-Bus from both alternators.  Does this assume the pilot will shed load (if necessary) from the main bus necessary to stay below the output of the backup alternator in order to save the battery,  until those devices are required for approach and landing? 	


    Correct. Z-12 was included in the Z-figures not

    so much because it was recommended for new design.

    It's an example of how the SD-20 can be added to

    and existing Z-11 style system (typical of most

    TC aircraft). Z-12 is installed in hundreds of

    TC aircraft as a factory options or aftermarket

    kit.



    However, Z-12 is a perfectly practical way to integrate

    the SD-20 into a single battery, two alternator system

    whether by system upgrade or new construction.  MUCH

    preferred over the abortive Z-13/20. If one is inclined

    to dual batteries, then Z-14 is a seamless way to

    get the two alternators wired up.



  	  Quote: 	
		    

 Bob, I’m sure you know that when we ask these questions, it’s because (hopefully) we are thinking, which is a good thing. 	


    Absolutely!



  	  Quote: 	
		     I’m sure you’re beyond taking challenges/questioning of your designs personally.  I for one really appreciate you taking the time to answer questions and being here to educate. 	


    A recipe for success built from the minimum

    numbers of simple-ideas defends itself. If

    a recipe has errors of fact in logic or performance,

    it needs to be fixed . . .



    The teacher's worst nightmare is to discover a long

    history of promoting a bad idea for lack of 

    study or errors in perception. Propagandists don't

    concern themselves with such things. 



 

   Bob . . .    [quote][b]

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