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ENDURANCE BUS ALTERNATIVE

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user9253

Joined: 28 Mar 2008
Posts: 1924
Location: Riley TWP Michigan

Posted: Sun Feb 24, 2019 5:20 pm Post subject: ENDURANCE BUS ALTERNATIVE

If the main purpose of the Endurance Bus is to reduce pilot workload in case the 

alternator fails, then there is an alternative solution.  Arrange the switches in 

order of importance and color code them.  When the alternator fails, the pilot 

finishes his coffee, then starts shutting off switches on the far right and 

works his way to the left.  Several switches could be shut off with one motion 

of the hand.  A physical barrier or open space could separate essential 

switches from non-essential ones.  The advantage of this architecture is a 

simplified electrical system, only one bus, no diodes, and yes, even reduced 

pilot workload.  She will not have to remember which loads are connected to 

which bus.  Some loads could be essential or not depending on the flight 

conditions.  Just turn them on or off as needed.

_  What about the backup-electrical-current path that the E-Bus relay 

provides?  No problem, just install a 40 amp automotive relay (disabled 

during starting) in parallel with the battery contactor.  The master switch 

would have 3 positions: down-off, center-relay, up-contactor.

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Joe Gores

henador_titzoff(at)yahoo.
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Posted: Mon Feb 25, 2019 4:53 am Post subject: ENDURANCE BUS ALTERNATIVE

Joe,

Your description of one common bus with multiple switches to select singular on and offs is brilliant!  It assumes that one has plenty of time to determine what to turn on and off, but it's typically true in light emergencies such as an alternator failure. I'm not sure what you mean by the "backup-electrical-current" path that the E-bus relay provides.  Can you please explain it?

I'm not saying that the E-bus concept is a failure.  It's being used successfully today in many experimentals and when certain failure modes occur, I'm sure it validates itself.  From a pilot's point of view, it's a much simpler interface, and simplicity is good in dire emergencies.



Henador Titzoff



         



                  

                                                                    On Sunday, February 24, 2019, 8:37:01 PM EST, user9253 <fransew(at)gmail.com> wrote:                 

                 



                 



                 --> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com (fransew(at)gmail.com)>



If the main purpose of the Endurance Bus is to reduce pilot workload in case the 



alternator fails, then there is an alternative solution.  Arrange the switches in 



order of importance and color code them.  When the alternator fails, the pilot 



finishes his coffee, then starts shutting off switches on the far right and 



works his way to the left.  Several switches could be shut off with one motion 



of the hand.  A physical barrier or open space could separate essential 



switches from non-essential ones.  The advantage of this architecture is a 



simplified electrical system, only one bus, no diodes, and yes, even reduced 



pilot workload.  She will not have to remember which loads are connected to 



which bus.  Some loads could be essential or not depending on the flight 



conditions.  Just turn them on or off as needed.



_  What about the backup-electrical-current path that the E-Bus relay 



provides?  No problem, just install a 40 amp automotive relay (disabled 



during starting) in parallel with the battery contactor.  The master switch 



would have 3 positions: down-off, center-relay, up-contactor.



--------



Joe Gores



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user9253

Joined: 28 Mar 2008
Posts: 1924
Location: Riley TWP Michigan

Posted: Mon Feb 25, 2019 7:28 am Post subject: Re: ENDURANCE BUS ALTERNATIVE

Thanks for your reply Henador.  Most of Bob's "Z" figures have an Endurance 

Bus which can receive electrical power from the battery via two possible paths.  

Using Z-13/8 as an example, the normal path is from the battery, through the 

battery contactor and though a diode to the Endurance Bus.  The alternate 

current path is from the battery bus, through the E-Bus relay to the Endurance 

Bus.  There is certainly nothing wrong with Bob's architecture.  In fact, many 

builders are better off using one of his proven wiring diagrams instead of 

designing their own.  Some builder architecture has a hidden flaw that only 

becomes apparent under certain conditions.  The more complicated the 

electrical architecture is, the greater the chance of pilot error when the mind 

goes blank in in a emergency.

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