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tmurphy(at)greenhills.net
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 Posted: Mon Dec 18, 2006 9:32 am Post subject: Z-11 |
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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
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| Posted: Mon Dec 18, 2006 11:32 am Post subject: Z-11 |
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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
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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
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| Posted: Mon Dec 18, 2006 11:49 am Post subject: Z-11 |
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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
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| Posted: Mon Dec 18, 2006 1:18 pm Post subject: Z-11 |
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..) 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
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| Posted: Mon Dec 18, 2006 2:54 pm Post subject: Z-11 |
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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
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| Posted: Mon Dec 18, 2006 3:43 pm Post subject: Z-11 |
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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
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| Posted: Mon Dec 18, 2006 5:34 pm Post subject: Z-11 |
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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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