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nuckolls.bob(at)aeroelect
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 Posted: Thu Jul 29, 2010 2:03 pm Post subject: dual bus, single battery |
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At 01:52 PM 7/29/2010, you wrote:
>>Why not Z 13/8?
>>> Or Z8? See: http://www.aeroelectric.com/Laury/Z-Laury_A.pdf
While I will not be enjoying the quick load-shed capability that a
true endurance bus affords, it will get me an Avionics switch (I
know, Mr. Nuckolls, it will only take me 4 seconds to turn on and off
my avionics equipment, but I still can't seem to let go!)
>>> Are you planning to install avionics known to be
>>> so fragile that they cannot tolerate life in
>>> the "aircraft wild"?
Bob . . .
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andrew.d.zachar(at)gmail.
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| Posted: Thu Jul 29, 2010 5:45 pm Post subject: dual bus, single battery |
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Of course, all installed avionics will be aircraft wild tolerant... I do admit, the appeal of an AMS is purely aesthetic (convenience, really), one switch flip after engine start brings them all online, why have avionics on before the start if you dont have to? The second feed should cover me from the dreaded single point failure scenario.
But also, what I'm calling an AMS is really just an ebus alternate feed switch in other z drawings (the ebusses are always dual-fed), and I'm substituting a crossfeed contactor for the diode normally used to act as my backup bus feed. I'm just not splitting things up based on a load shed scenario, but rather a normal operations convenience scenario.
I thought I understood all of the heartburn about the AMS switch after reading the connection and some supplementary articles on the website... Am I still missing something?
Keep the thoughts coming, though; I haven't quite convinced myself that I should let convenience drive my architecture as opposed to some other factor (like fast load shedding!).
I appreciate everyone's replies (and of course, the opportunity to learn from all of the posts and discussions shared on the list).
__
Andrew Zachar
andrew.d.zachar(at)gmail.com
On Jul 29, 2010, at 6:02 PM, "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com> wrote:
| Quote: |
At 01:52 PM 7/29/2010, you wrote:
>>Why not Z 13/8?
>>> Or Z8? See: http://www.aeroelectric.com/Laury/Z-Laury_A.pdf
While I will not be enjoying the quick load-shed capability that a true endurance bus affords, it will get me an Avionics switch (I know, Mr. Nuckolls, it will only take me 4 seconds to turn on and off my avionics equipment, but I still can't seem to let go!)
>>> Are you planning to install avionics known to be
>>> so fragile that they cannot tolerate life in
>>> the "aircraft wild"?
Bob . . .
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nuckolls.bob(at)aeroelect
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| Posted: Fri Jul 30, 2010 6:27 am Post subject: dual bus, single battery |
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| Quote: | I thought I understood all of the heartburn about the AMS switch
after reading the connection and some supplementary articles on the
website... Am I still missing something?
|
Probably not. The design goals behind the Z-figures is to
minimize weight, complexity, cost and risk. I.e. the
elegant solution. Beyond that, one can make any number
of variations to suit personal tastes . . . it's like
picking paint colors and upholstery fabric. The only
caveat is to be sensitive to increases in risk . . .
which may be perfectly acceptable . . . it's your
choice.
| Quote: | Keep the thoughts coming, though; I haven't quite convinced myself
that I should let convenience drive my architecture as opposed to
some other factor (like fast load shedding!).
|
Speed in the load shedding activity is not a big
design driver. If you finished a cup of coffee with
the low voltage light flashing, it probably wouldn't
make any difference in the outcome of your flight.
Other than smoke in the cockpit or sparks from a
radio, no electrical failure is cause for heroic
action.
My advice to builders over the years is to take
a Z-figure (mature and well examined over the
years) that most closely meets your needs and
then identify shortfalls that my be unique to
your needs and desires.
If the shortfalls are just matters of preference
and do not drive risk to unacceptable levels,
why not modify accordingly? What we cannot do
as an advisory group is put weight on preferences
nor willingness to accept risk. We can't even
put numbers on risk.
All that can be said about the Z-figures is that
they've been pondered and proven over the past
20 years or so and offer comfortable recipes
for success. The Z-figures are not the ONLY
recipes for success. But a NEW recipe necessarily
starts the proofing task over.
Bob . . .
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