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Subject: RE: [FlyRotary] Z-19 questions
Date: Sat, 25 Nov 2006 07:56:15 -0600
Message-ID: <5B59870CA143DD408BD6279374B74C8B010C2036@MAIL02.austin.utexas.edu>
Thread-Topic: [FlyRotary] Z-19 questions
Thread-Index: AccPzsRRh/zh8m+5TOWQhjjyaPolcgAyIpHj
References: <list-1598981@logan.com>
From: "Mark R Steitle" <mark.steitle@austin.utexas.edu>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>

This is a multi-part message in MIME format.

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Hi Bill,=20
Have you checked out Aero-Electric's Z-14 architecture?  Dual =
alternators, dual batteries.  The two PC-680 Odyssey batteries are =
independent of each other, but can be connected by flipping a crossover =
switch on the panel in the event of an alternator failure.  The second =
battery automatically kicks in during starting.  This is what I did on =
my ES and it seems to be working pretty well so far (10 hrs of ground =
running, no flight time, yet). =20
=20
One modification I made to the Z-14 design (at the suggestion of Ed =
Anderson) was to put all the engine critical items on a separate "always =
hot" bus, with breakers.  Each fuel pump has its own breaker, leading =
and trailing coils have their own as do the primary and secondary =
injectors.=20
=20
I also used dual EFI fuel pumps, plumbed in parallel.  They feed into =
two stainless GM efi filters.  The pumps are controlled by a pressure =
switch and relay.  In other words, they are both switches are on, but =
only one pump is running during normal operation.  In case of a low =
pressure event (pressure sag), the relay turns the second fuel pump on =
before you can say "wazzzzup".  It also lights an LED on the panel to =
tell you that the boost pump is running.  You must manually reset it =
back to single pump mode.  This is the Eggenfelner design and you can =
get part numbers and schematics on their site, if you're interested.
=20
Mark S.   =20

________________________________

From: Rotary motors in aircraft on behalf of Bill Bradburry
Sent: Fri 11/24/2006 7:45 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Z-19 questions


OK, This is my fall back position.  I have posed this question on the
Aerolectric list for a couple of days and no answer. (although the email
did get caught up in an embarrasing event!)  90% of you guys have
already wired your planes and followed Bob N's advice, so how did you do
the redundancy on the fuel pumps, coils, and injectors?

from the AE list:

   "I am installing a fuel injected Mazda rotary engine and trying to =
follow the Z-19 guidelines for dual battery, single alternator.  Looking =
at the engine primary and secondary circuit, I need to install a primary =
and secondary fuel pump, plus I want to power the coils and the =
injectors
    off of the battery buss.
    How should I do this?  I suppose I could take the fuel pump diode =
output and switch it to either of the two fuel pumps???
    What about the coils and injectors?  Should I set up similar =
circuits
    for them, or is there a better way to reduce parts???
    I would appreciate any guidance you guys could give me.
    Thanks and Happy Thanksgiving!
    Bill B


--
Homepage:  http://www.flyrotary.com/
Archive and UnSub:   http://mail.lancaironline.net/lists/flyrotary/


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