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Z-11

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tmurphy(at)greenhills.net
Guest

Posted: Mon Dec 18, 2006 9:32 am Post subject: Z-11

I'm a new builder considering the Z-11 system.  Appears the Endurance Bus is powered from two sources, the Main Power  Distribution Bus through the diode and or the Main Battery Bus through the  Endurance Bus Alternate Feed switch. Why ?  Is the Endurance Bus Alternate  Feed switch on for normal flight operations ? Tom

   [quote][b]

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nuckollsr(at)cox.net
Guest

Posted: Mon Dec 18, 2006 11:32 am Post subject: Z-11

At 11:31 AM 12/18/2006 -0600, you wrote:



 	  Quote: 	
		  I'm a new builder considering the Z-11 system. Appears the Endurance Bus 

is powered from two sources, the Main Power Distribution Bus through the 

diode and or the Main Battery Bus through the Endurance Bus Alternate Feed 

switch. Why ?  Is the Endurance Bus Alternate Feed switch on for normal 

flight operations ? Tom


	




    This is covered in the List archives, chapter 17 of the 'Connection,

    and various resources on http://aeroelectric.com



    Put "endurance bus" in the search box and hit "Google Search"



    The goal is to have two, independent sources of power for electro-whizzies

    that are useful for comfortable continuation of flight in battery-only

    operations . . . with endurance that meets your personal design goals

    for this mode of operation.



    The alternate feed switch and pathway should be pre-flight tested but left

    OFF for normal operations.



    Bob . . .

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

      < What is so wonderful about scientific truth...is that >

      < the authority which determines whether there can be   >

      < debate or not does not reside in some fraternity of   >

      < scientists; nor is it divine. The authority rests     >

      < with experiment.                                      >

      <                            --Lawrence M. Krauss       >

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

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dennis.glaeser(at)eds.com
Guest

Posted: Mon Dec 18, 2006 11:49 am Post subject: Z-11

Tom,



No, the Endurance Bus Alternate Feed switch is meant for 'battery only'

(alternator failed) operations.  The reasons for this approach are:

	- eliminates the battery contactor (saves the energy it would

otherwise draw)

	- configures your electrical system for battery-only operation

with the flip of 2 switches:

		- E-Bus Alternate feed ON

		- Master switch OFF

	- redundant feed for essential stuff if the battery contactor

fails



The E-Bus should have only the essential items for continued flight

(typically EFIS, radios, panel lights - if you fly at night.  The goal

is to have enough juice in the battery to last as long as your fuel

(fairly easy to do unless you have an electrically dependent engine).

When you arrive at your destination, if you want stuff that is not on

the E-Bus (i.e. flaps, landing light, ...) you can turn the master back

on for the last few minutes of flight.



Dennis Glaeser



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

-

From:      Tom Murphy (tmurphy(at)greenhills.net) 

Date:      Mon Dec 18 - 9:32 AM 



I'm a new builder considering the Z-11 system. Appears the Endurance Bus



is powered from two sources, the Main Power Distribution Bus through the



diode and or the Main Battery Bus through the Endurance Bus Alternate 

Feed switch. Why ?  Is the Endurance Bus Alternate Feed switch on for 

normal flight operations ? Tom

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JOHN TIPTON

Joined: 17 Sep 2006
Posts: 239
Location: Torquay - England

Posted: Mon Dec 18, 2006 1:18 pm Post subject: Z-11

..) you can turn the master back

on for the last few minutes of flight.



If the battery is flat - where is the power coming from ?



John



---

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trichmond(at)obermeyer.co
Guest

Posted: Mon Dec 18, 2006 2:54 pm Post subject: Z-11

Bob,



I've tried to figure this out, but what is the downside of running with the

essential bus closed?  The reason I ask is this, if I need to use the e-bus

there is a risk that I could open the battery master before closing the

e-bus (i.e. panic and hit the switches in the wrong order).  With a glass

panel this would temporarily interrupt all power and require a re-boot.

Thoughts?



Thanks,  



Todd R Richmond

RV-7A Fuse

--

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Dennis Glaeser

Joined: 10 Jan 2006
Posts: 53
Location: Rochester Hills, Michigan

Posted: Mon Dec 18, 2006 3:43 pm Post subject: Z-11

If you get immediate notification of alternator failure, and then minimize

power use with the E-Bus architecture hopefully your battery won't be dead

when you get to your destination.  At least that's the plan...



Dennis



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

--

Subject:      Re: Re: Z-11

From:      JOHN TIPTON (jmtipton(at)btopenworld.com)

Date:      Mon Dec 18 - 1:18 PM



..) you can turn the master back

on for the last few minutes of flight.



If the battery is flat - where is the power coming from ?



John

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nuckollsr(at)cox.net
Guest

Posted: Mon Dec 18, 2006 5:34 pm Post subject: Z-11

At 03:53 PM 12/18/2006 -0700, you wrote:



 	  Quote: 	
		  

<trichmond(at)obermeyer.com>



Bob,



I've tried to figure this out, but what is the downside of running with the

essential bus closed?  The reason I ask is this, if I need to use the e-bus

there is a risk that I could open the battery master before closing the

e-bus (i.e. panic and hit the switches in the wrong order).  With a glass

panel this would temporarily interrupt all power and require a re-boot.

Thoughts?



Thanks,


	


   It doesn't hurt to run with it closed . . .  but if one is subject

   to panic driven actions, then there is no magic pre-positioning

   of switches that will absolutely guarantee that don't do something that

   you'll later wish had been different.



   If you have active notification of alternator failure (low voltage

   warning light) then from the time your alternator quits (followed in

   seconds by low volts warning) to the time you begin to do something about

   it is not critical. Whether you take a minute or more to re-configure for

   battery only ops . . . or get 'er done in 2.3 seconds flat will have no

   appreciable difference in the outcome of the flight.



   In other words, it's an endurance bus, not an emergency bus. We're

   designing systems that are failure tolerant and have very low orders

   of probability of causing a bad day in the cockpit. So when the warning

   light flashes, fold the chart and finish the mouth-full of peanuts and

   Pepsi before you start flipping switches. The point is that we tend to

   worry (and even react badly) to situations not well understood. Know that

   an alternator failure need not be a big deal if you've done your homework

   for battery sizing, battery maintenance, and e-bus load sizing.



   Bob . . .

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