Today's Message Index:
----------------------
0. 12:17 AM - What's My Contribution Used For? (Matt Dralle)
1. 07:04 AM - Re: Re: EFIS backup battery switch wiring (Robert L. Nuckolls, III)
2. 10:22 AM - Need advice on Z16 5amp circuit breaker (Geoff Heap)
3. 10:45 AM - Re: Need advice on Z16 5amp circuit breaker (Robert L. Nuckolls, III)
4. 10:53 AM - Matronics Fund Raiser (Robert L. Nuckolls, III)
5. 11:18 AM - Re: Need advice on Z16 5amp circuit breaker (Matt Prather)
6. 11:41 AM - Re: Need advice on Z16 5amp circuit breaker (Geoff Heap)
7. 12:56 PM - Re: Matronics Fund Raiser (Tim Olson)
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| Subject: | What's My Contribution Used For? |
Dear Listers,
Some have asked, "What's my Contribution used for?" and that's a good question.
Here are just a few examples of what your direct List support enables. It provides
for the very expensive, commercial-grade T1 Internet connection used on
the List insuring maximum performance and minimal contention when accessing List
services. It pays for the regular system hardware and software upgrades enabling
the highest performance possible for services such as the Archive Search
Engine, List Browser, and Forums. It pays for narly 20 years (yeah, I really
said *20* years) worth of online archive data available for instant random search
and access. And, it offsets the many hours spent writing, developing, and
maintaining the custom applications that power this List Service such as the List
Browse, Search Engine, Forums, and Wiki.
But most importantly, your List Contribution enables a forum where you and your
peers can communicate freely in an environment that is free from moderation,
censorship, advertising, commercialism, SPAM, and computer viruses. How many places
on the Internet can you make all those statements these days?
It is YOUR CONTRIBUTION that directly enables these many aspects of these valuable
List services. Please support it today with your List Contribution. Its one
of the best investments you can make in your Sport...
List Contribution Web Site:
http://www.matronics.com/contribution
Thank you for your support!
Matt Dralle
Email List Administrator
Message 1
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| Subject: | Re: EFIS backup battery switch wiring |
When crafting your project's electrical system architecture
it would be helpful to be aware of the marketplace for
to which avionics suppliers deliver most of their products.
99.9% of all light aircraft built feature an architecture
that has not changed materially in 40+ years when the
avionics bus and master switch was added to protect
transistors from will-o'-the-wisp spikes.
Those same aircraft are largely owned and operated
by individuals who know little if any more about their
airplanes than they do about their cars. Further, even
if they knew and understood a great deal about them,
they would not be permitted by regulation to make
any meaningful improvements upon them. Phrases
like "failure tolerance", "meeting design goals",
and "artful preventative maintenance for maintenance
of system reliability" might just as well be spoken
in Swahili.
Now we have the starry-eyed entrepreneur who
tailors a product for best-fit into spam-can/
FAA-trained aviation. Not only is the product marketed
and sold as the greatest accessory since sliced bread,
it may include a suite of "back up" features designed
to ward of a host of failures uncomfortable to contemplate.
Internal back up batteries are popular. Keep in
mind that internal batteries MIGHT make sense in
the spam-can/FAA-trained world of flight . . . but
we're OBAM aviation. We can craft power sources that
are exceedingly robust. In fact so robust that
flight-critical systems are more likely to become
unavailable due to internal failure than for lack of
ship's power.
Staying true to our design goals for failure tolerance:
If your are PLANNING for any accessory to be critical
to comfortable completion of flight, then your plan-B
for failure of that device needs to go BEYOND any
need for ship's power. If you have a system like Z-13/8
(and assuming further that you exercise due diligence for
battery maintenance) then the probability of the E-bus
ever becoming un-powered in flight is on the same
order as prop bolt failure.
At the same time, probability of some flight critical
system going down for for reasons OTHER than power
failure is decidedly higher.
With that reasoning in mind I'll suggest that fussing
over the optimum back-up battery installation for any
accessory is a distraction from the real task of
crafting a failure tolerant system.
If it were my airplane, I'd go for Z-13/8, ditch the
internal back-up batteries and figure out how I'm
going to comfortably deal with a failure of the LEDs
that light up the screen or a rate sensor that goes
south, etc. etc.
Bob . . .
---------------------------------------
( It's MATRONICS FUND RAISER MONTH! )
( Do your part to keep this marvelous )
( tool sharp and available to all our )
( brothers in the OBAM aviation )
( community. )
---------------------------------------
Message 2
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| Subject: | Need advice on Z16 5amp circuit breaker |
Ref Z16 schematic. There is a 5 amp circuit breaker on the wire from the main bus
to the S700-2-10 Master. Can I use an in line 5 amp fuse. I would appreciate
the advice. Thanks.....Geoff
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=273560#273560
Message 3
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| Subject: | Re: Need advice on Z16 5amp circuit breaker |
At 12:20 PM 11/18/2009, you wrote:
>
>Ref Z16 schematic. There is a 5 amp circuit breaker on the wire from
>the main bus to the S700-2-10 Master. Can I use an in line 5 amp
>fuse. I would appreciate the advice. Thanks.....Geoff
You're apparently unaware of why the breaker is even there . . .
The Z-figures are intended to display various ARCHITECTURES,
not recommended wiring diagrams and bills-of-materials. In
the case of Z-16, it shows the use of fuseblocks in combination
with a CROWBAR over voltage protection system. A panel re-setable
breaker is one of the installation requirements for a crowbar
ov protection system. So when combining with fuseblocks, the
solitary breaker illustrated is part of the system integration
task.
Now, if your choice of power distribution protection is
breakers instead of fuses then the 5A breaker would be
right on the bus and labeled ALT FIELD. If you're
going to use some form of field disconnect ov protection
system, then yes, the 5A breaker could be a fuse . . . but
not an in-line . . . it would be one of many fuses on the
main bus.
The simple answer to your question depends on the
combination of components you're planning to use. In
all cases, an in-line fuse is not a recommended
substitute in any case. If you're using fuse blocks
AND have crowbar ov protection, then you need the breaker
as suggested.
Bob . . .
---------------------------------------
( It's MATRONICS FUND RAISER MONTH! )
( Do your part to keep this marvelous )
( tool sharp and available to all our )
( brothers in the OBAM aviation )
( community. )
---------------------------------------
Message 4
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| Subject: | Matronics Fund Raiser |
The month is half-gone and Matt's receipts are running
about 20% behind last year . . . while the costs of
maintaining his system have, no doubt, gone up.
If you haven't already contributed to this worthy cause,
please do so. $5 will barely buy a lunch at McD's.
There are 1800+ folks subscribing to this List alone . . . .
a $5 donation from each of us would make sure that
this magnificent system stays healthy. It just
takes a few minutes to insure continuance of a system
that supports tens of thousands of person-hours per
year in volunteer effort.
Bob . . .
---------------------------------------
( It's MATRONICS FUND RAISER MONTH! )
( Do your part to keep this marvelous )
( tool sharp and available to all our )
( brothers in the OBAM aviation )
( community. )
---------------------------------------
Message 5
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| Subject: | Re: Need advice on Z16 5amp circuit breaker |
Bob,
Questions about the field breaker are a relatively common. I know you
cover the reasoning for the breaker in the discussion about over voltage
protection but it seems there ends up being a disconnect when people look
at the Z diagrams. I kind of suspect that many more people look at the Z
diagrams (seeking a wiring diagram/recipe) than read all parts of the
Aeroelectric connection book, so some may miss the part about crowbars,
etc. I see that you have a descriptive note (18) regarding the crowbar
module..
Maybe it would help people if there were an additional note next to the
field breaker that said something about this being part of the crowbar OV
circuit functionality - maybe refer to your discussion about controlling
alternators. I realize you don't mind answering the same question
multiple times (in the interest of educating an ever changing classroom),
but this could be a place where a tiny amount of additional documentation
speeds the whole process.
Regards,
Matt-
> <nuckolls.bob@aeroelectric.com>
>
> At 12:20 PM 11/18/2009, you wrote:
>> <stol10@comcast.net>
>>
>>Ref Z16 schematic. There is a 5 amp circuit breaker on the wire from
>>the main bus to the S700-2-10 Master. Can I use an in line 5 amp
>>fuse. I would appreciate the advice. Thanks.....Geoff
>
> You're apparently unaware of why the breaker is even there . . .
>
> The Z-figures are intended to display various ARCHITECTURES,
> not recommended wiring diagrams and bills-of-materials. In
> the case of Z-16, it shows the use of fuseblocks in combination
> with a CROWBAR over voltage protection system. A panel re-setable
> breaker is one of the installation requirements for a crowbar
> ov protection system. So when combining with fuseblocks, the
> solitary breaker illustrated is part of the system integration
> task.
>
> Now, if your choice of power distribution protection is
> breakers instead of fuses then the 5A breaker would be
> right on the bus and labeled ALT FIELD. If you're
> going to use some form of field disconnect ov protection
> system, then yes, the 5A breaker could be a fuse . . . but
> not an in-line . . . it would be one of many fuses on the
> main bus.
>
> The simple answer to your question depends on the
> combination of components you're planning to use. In
> all cases, an in-line fuse is not a recommended
> substitute in any case. If you're using fuse blocks
> AND have crowbar ov protection, then you need the breaker
> as suggested.
>
>
> Bob . . .
>
> ---------------------------------------
> ( It's MATRONICS FUND RAISER MONTH! )
> ( Do your part to keep this marvelous )
> ( tool sharp and available to all our )
> ( brothers in the OBAM aviation )
> ( community. )
> ---------------------------------------
>
>
Message 6
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| Subject: | Re: Need advice on Z16 5amp circuit breaker |
Thanks for the info Bob. Correct. I did not know why it is there......Geoff
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=273584#273584
Message 7
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| Subject: | Re: Matronics Fund Raiser |
Heck I think last year he was down, too....so if it's 20% behind
last year, it could be getting even tougher.
Tim Olson - (Proud to be a donor)
do not archive
Robert L. Nuckolls, III wrote:
> <nuckolls.bob@aeroelectric.com>
>
> The month is half-gone and Matt's receipts are running
> about 20% behind last year . . . while the costs of
> maintaining his system have, no doubt, gone up.
>
> If you haven't already contributed to this worthy cause,
> please do so. $5 will barely buy a lunch at McD's.
> There are 1800+ folks subscribing to this List alone . . . .
> a $5 donation from each of us would make sure that
> this magnificent system stays healthy. It just
> takes a few minutes to insure continuance of a system
> that supports tens of thousands of person-hours per
> year in volunteer effort.
>
>
>
> Bob . . .
>
> ---------------------------------------
> ( It's MATRONICS FUND RAISER MONTH! )
> ( Do your part to keep this marvelous )
> ( tool sharp and available to all our )
> ( brothers in the OBAM aviation )
> ( community. )
> ---------------------------------------
>
>
>
>
>
>
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