nuckollsr(at)cox.net
Guest
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 Posted: Sat Nov 25, 2006 3:30 pm Post subject: Second Pump Option on Z-19 |
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At 09:20 AM 11/25/2006 -0600, you wrote:
| Quote: |
<nuckollsr(at)cox.net>
At 08:11 AM 11/25/2006 -0500, you wrote:
>
><bbradburry(at)allvantage.com>
>
>My original question has generated absolutely no interest!! Lots of
>discussion of measurement systems, are you grounded when only one foot is
>on the floor, etc., but my silly little question has been ignored for
>days even when it was embroiled in the screwup of the month! {:<(
>
>Surely you guys don't want me to have to go and figure this out on my
>own!! My blood would be on your hands!! {:<)
>
>Here tis' again:
Yes it has. I've been pondering the underlying
philosophy behind what I will offer later today.
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Without knowing more about how tollerant your engine
engine is with various failures of hardware, I'm presuming
that you're interested in Figure Z-19 but noted that it supports
only one fuel pump.
After some pondering of the failure modes, it seems practical
that your second pump simply be added to one of the battery
busses (in this case the Main Battery bus) as shown in revision
M to Figure Z-19 as posted here . . .
http://www.aeroelectric.com/PPS/ACAD_Architecture_Dwgs/Z19M.dwg
http://www.aeroelectric.com/PPS/Adobe_Architecture_Pdfs/Z19M_1.pdf
http://www.aeroelectric.com/PPS/Adobe_Architecture_Pdfs/Z19M_2.pdf
The primary pump and ECS both get supplied from dual power
sources with no single points of failure upstream of the
diodes as before. Obviously, failure of #1 pump stops the
engine so if you want a second pump, it's sufficient to
power it from one of the battery busses through it's own switch.
I presume you'll have a fuel pressure gage so to pre-flight,
you turn on the #2 pump momentarily to watch for rise in fuel
pressure before you power up the engine using the #1 pump
in normal operation.
Bob . . .
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