Today's Message Index:
----------------------
1. 03:10 AM - Re: Lithium Ion Battery for OBAM aircraft pr oject (jan)
2. 08:19 AM - Re: Z13/8 all electric airplane (jonlaury)
3. 10:05 AM - Re: Re: Z13/8 all electric airplane (Bob McCallum)
4. 11:20 AM - Re: Lithium Ion Battery for OBAM aircraft pr oject (Robert L. Nuckolls, III)
5. 11:38 AM - Re: Re: Z13/8 all electric airplane (Robert L. Nuckolls, III)
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Subject: | Lithium Ion Battery for OBAM aircraft pr oject |
Hi Bob,
I am going to the US next month for 2 weeks with work - was thinking of
picking up a copy of your book. From a previous post - I noted that you are
working on a 'complete update' - (or maybe I got this wrong ??) ..
If a new book will be available - will it be so in time for my visit ?? I
am going to Kansas
Have a good weekend !
Jan
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L.
Nuckolls, III
Sent: 11 May 2013 23:56
Subject: RE: AeroElectric-List: Lithium Ion Battery for OBAM aircraft
project
I believe that they mean UL1642.
http://ulstandardsinfonet.ul.com/scopes/scopes.asp?fn=1642.html
<http://ulstandardsinfonet.ul.com/scopes/scopes.asp?fn=1642.html>
Could be. Thanks. I'll see if I can track down
either one . . .
Bob . . .
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<p class=MsoNormal><font size=2 color=navy face=Arial><span
style='font-size:
10.0pt;font-family:Arial;color:navy'>Hi <st1:PersonName
w:st="on">Bob</st1:PersonName>,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span
style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span
style='font-size:
10.0pt;font-family:Arial;color:navy'>I am going to the
<st1:country-region
w:st="on"><st1:place w:st="on">US</st1:place></st1:country-region>
next month
for 2 weeks with work – was thinking of picking up a copy of your
book. From
a previous post – I noted that you are working on a
‘complete
update’ – (or maybe I got this wrong ??)
..<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span
style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span
style='font-size:
10.0pt;font-family:Arial;color:navy'>If a new book will be available
–
will it be so in time for my visit ?? I am going to <st1:State
w:st="on"><st1:place
w:st="on">Kansas</st1:place></st1:State><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span
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10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span
style='font-size:
10.0pt;font-family:Arial;color:navy'>Have a good weekend
!<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span
style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span
style='font-size:
10.0pt;font-family:Arial;color:navy'>Jan<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span
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10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span
style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
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face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Robert L. Nuckolls,
III<br>
<b><span style='font-weight:bold'>Sent:</span></b> 11 May 2013
23:56<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName
w:st="on">aeroelectric-list@matronics.com</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> RE:
AeroElectric-List:
Lithium Ion Battery for OBAM aircraft
project</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span
style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal><b><font size=3 face="Times New Roman"><span
style='font-size:12.0pt;font-weight:bold'><br>
</span></font></b>I believe that they mean UL1642.<br>
<br>
<a
href="http://ulstandardsinfonet.ul.com/scopes/scopes.asp?fn=1642.htm
l">http://ulstandardsinfonet.ul.com/scopes/scopes.asp?fn=1642.html</a>
<o:p></o:p></p>
</blockquote>
<p class=MsoNormal><font size=3 face="Times New Roman"><span
style='font-size:
12.0pt'><br>
Could be. Thanks. I'll see if I can track down<br>
either one . . .<br>
<br>
<br>
<o:p></o:p></span></font></p>
<x-sigsep>
<p></x-sigsep><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>
<st1:PersonName w:st="on">Bob</st1:PersonName> . . .
<o:p></o:p></span></font></p>
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Message 2
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Subject: | Re: Z13/8 all electric airplane |
[/quote]
yep, here's a thread from 2008...
Bob . . . [quote]
Bob,
My question was less about electron directional flow than it was about the fellow's
intention to connect the switch/breaker to GND. Unless he is switching/breaking
the GND to control the alternator field, which I thought in most instances
was bad practice, isn't he wiring up a dead short that will trip the breaker
everytime the alt field is switched on?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=400944#400944
Message 3
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Subject: | Re: Z13/8 all electric airplane |
Jon;
Did you look at schematic Z13/8 to see what is being discussed?? There is
no "field" associated with the AUX alternator as it's a PM type. (Dynamo in
the dwg) The schematic clearly shows the breaker and switch connected
between the alternator "B" lead relay and ground. And yes, when the over
voltage module operates it causes a direct short to ground through this
breaker tripping it.
Bob McC
> -----Original Message-----
> From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-
> server@matronics.com] On Behalf Of jonlaury
> Sent: Sunday, May 19, 2013 11:19 AM
> To: aeroelectric-list@matronics.com
> Subject: AeroElectric-List: Re: Z13/8 all electric airplane
>
>
> [/quote]
> yep, here's a thread from 2008...
>
>
>
> Bob . . . [quote]
>
> Bob,
> My question was less about electron directional flow than it was about the
fellow's
> intention to connect the switch/breaker to GND. Unless he is
switching/breaking the
> GND to control the alternator field, which I thought in most instances was
bad
> practice, isn't he wiring up a dead short that will trip the breaker
everytime the alt
> field is switched on?
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=400944#400944
>
>
>
>
>
>
>
> _-
> ====================================================
> ======
> _-
> ====================================================
> ======
> _-
> ====================================================
> ======
> _-
> ====================================================
> ======
>
>
Message 4
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Subject: | Lithium Ion Battery for OBAM aircraft pr oject |
At 05:21 AM 5/19/2013, you wrote:
>Hi Bob,
>
>I am going to the US next month for 2 weeks with
>work ' was thinking of picking up a copy of your
>book. From a previous post ' I noted that you
>are working on a =91complete update=92 ' (or maybe I got this wrong ??)
..
yes but several months out yet . . .
>
>If a new book will be available ' will it be so
>in time for my visit ?? I am going to Kansas
Where in Ks?
Bob . . .
Message 5
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Subject: | Re: Z13/8 all electric airplane |
>My question was less about electron directional flow than it was
>about the fellow's intention to connect the switch/breaker to GND.
>Unless he is switching/breaking the GND to control the alternator
>field, which I thought in most instances was bad practice, isn't he
>wiring up a dead short that will trip the breaker everytime the alt
>field is switched on?
As Bob suggests . . . trace the circuit.
The alternator control switch is used to
energize a relay that connects the PM
alternator to the BUS.
The control relay coil is paralleled with
a crowbar OVM . . . open circuit 99.99%
of the time but becomes a dead short
when voltage across the device exceeds
about 16.4 volts.
The "short" across the relay coil would
indeed force it to relax the contacts and
disconnect the offending alternator from
the bus. But it would also burn the wires
that supply power to the relay coil through
the closed switch.
The goal for keeping one's cockpit smoke free
suggest some form of fault current mitigation
like a fuse, breaker, polyswitch, etc.
In this case it's a breaker which can be ANYWHERE
along the series path from bus to ground.
Actually, I've been contemplating replacement of
the breaker in that drawing with a polyswitch.
Given the low current demands for driving the
relay coil, this would be an excellent place
to incorporate a polyswitch. I'm wrestling
with annunciation issues. A popped breaker is,
not a great annunciator but it's not bad. If
we 'hide' a tripped condition by going solid
state polyfuse, then perhaps some form of OV
TRIP indication is called for.
I've got some ideas and will incorporate the
most elegant configuration into the Z-figures
that control PM alternators with the RELAY/OVM
combination.
Bob . . .
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