Today's Message Index:
----------------------
1. 02:00 PM - z13 battery bus protection (mmcelrea)
2. 02:00 PM - Re: A bit of aviation history worth reviewing (speedy11@aol.com)
3. 03:41 PM - Re: z13 battery bus protection (Robert L. Nuckolls, III)
4. 04:00 PM - Re: z13 battery bus protection (Charlie England)
5. 04:01 PM - Re: Diy AOA, anyone ? (Robert L. Nuckolls, III)
Message 1
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| Subject: | z13 battery bus protection |
Hi.
On the Z13 design the wire from the contactor to the battery bus is recommended
to be 6" or less. I don't want to put the battery bus on the fwf but on a panel
with the other fuseblocks which will require a significantly longer wire. Is
it acceptable or necessary to protect this wire with a fuse link and if so what
size wire should I use? Max potential load will be about 15 amps.
Does the main bus wire require similar protection? I'm using a 4.5ft length of
6awg for it.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=479345#479345
Message 2
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| Subject: | Re: A bit of aviation history worth reviewing |
Bob,
Thanks for that video link. It was very interesting.
Stan Sutterfield
Time: 11:30:21 AM PST US
From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
Subject: AeroElectric-List: A bit of aviation history worth reviewing
https://youtu.be/F4KD5u-xkik
Bob . . .
Message 3
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| Subject: | Re: z13 battery bus protection |
At 03:59 PM 4/15/2018, you wrote:
>
>Hi.
>On the Z13 design the wire from the contactor to the battery bus is
>recommended to be 6" or less. I don't want to put the battery bus on
>the fwf but on a panel with the other fuseblocks which will require
>a significantly longer wire. Is it acceptable or necessary to
>protect this wire with a fuse link and if so what size wire should I
>use? Max potential load will be about 15 amps.
A battery bus is located proximal to the battery, else
it's not a battery bus. Fuseblocks on the panel? Why?
When would you EVER find value in fiddling with fuses
or breakers in flight? Have you read . . .
https://goo.gl/ytEfZJ
https://goo.gl/utXVam
https://goo.gl/L6VpN4
>Does the main bus wire require similar protection? I'm using a 4.5ft
>length of 6awg for it.
Study the z-figures . . . no such protection is required
or recommended for crew controlled FAT wires . . . i.e. they
go cold when the master is OFF.
Bob . . .
Message 4
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| Subject: | Re: z13 battery bus protection |
On 4/15/2018 5:40 PM, Robert L. Nuckolls, III wrote:
> At 03:59 PM 4/15/2018, you wrote:
>> <mmcelrea@hotmail.com>
>>
>> Hi.
>> On the Z13 design the wire from the contactor to the battery bus is
>> recommended to be 6" or less. I don't want to put the battery bus on
>> the fwf but on a panel with the other fuseblocks which will require a
>> significantly longer wire. Is it acceptable or necessary to protect
>> this wire with a fuse link and if so what size wire should I use? Max
>> potential load will be about 15 amps.
>
> A battery bus is located proximal to the battery, else
> it's not a battery bus. Fuseblocks on the panel? Why?
> When would you EVER find value in fiddling with fuses
> or breakers in flight? Have you read . . .
>
> https://goo.gl/ytEfZJ
>
> https://goo.gl/utXVam
>
> https://goo.gl/L6VpN4
>
>> Does the main bus wire require similar protection? I'm using a 4.5ft
>> length of 6awg for it.
>
> Study the z-figures . . . no such protection is required
> or recommended for crew controlled FAT wires . . . i.e. they
> go cold when the master is OFF.
>
>
> Bob . . .
>
Hi Bob,
Not to speak for the OP, but....
Note that he says *a* panel; not *the* panel. I can see the wiring logic
in a single firewall penetration wire and multiple feeds on the cold
side of the firewall from that battery bus. Perhaps there's a disconnect
(pardon the pun) in how each of you is defining a 'battery bus'. I can
think of at least one bus I'd want to bypass my master contactor: the
engine bus for an electrically dependent engine that's using automotive
style fuel injection. I fed mine using a fusible link to feed an engine
bus switch, which feeds the engine bus. (With a switched alternate feed
from the main bus.) 15 amps is a safe number for fuel pump, controller,
injectors, coils, etc.
Charlie
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Message 5
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| Subject: | Re: Diy AOA, anyone ? |
At 08:52 AM 4/12/2018, you wrote:
>
>Hi all,
>
>One of my building buddies just challenged me concerning the
>following Pitot angle of attack (AOA) device
>
>https://www.thingiverse.com/thing:1121786
>
>Of course 3D printing the device is the easiest part. But does
>anyone here happen to have implemented, programmed, etc. an AOA
>indicator, and with what success ?
>
>BTW, some years ago I had the opportunity to make a study for such a
>device based on differential pressure between upper and lower wing
>surface. At the time the study involved a University wind tunnel,
>hotwire profiles, several students, but nowadays my approach needs
>to be much much "lower tech" as I no longer have access to such facilities.
>
>Thanks for your inputs,
We had some discussions here on the List about
various AOA sensor/display options about 15 years
ago. During and since that time I'd collected some
articles on the topic which I posted here
https://goo.gl/5XdU1y
One of the articles cloned a sensor mast that
was popular with Piper as I recall. Don't recall
the manufacturer off hand.
Emacs!
This probe was mounted under a wing on an inspection
plate. Pretty easy to build. I recall that I offered to carve
one out for a builder . . . but he never took me up on it.
Something I've found quite useful before launching
on any new development effort is to explore history
of the practice. Patents are a useful place to lay foundations
for refining the next generation . . .
Bob . . .
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