Today's Message Index:
----------------------
1. 05:22 AM - Re: OV protection for PM alternators (Ken)
2. 08:23 AM - Re: Off Topic....Quo Vadis? (beecho@beecho.org)
3. 10:30 AM - Transformer (Mickey Billings)
4. 11:27 AM - Re: Transformer (Richard E. Tasker)
5. 12:49 PM - Re: Transformer (Mickey Billings)
6. 04:13 PM - Re: OV protection for PM alternators (David Carter)
7. 05:15 PM - Re: Re: Switched Pot (Robert L. Nuckolls, III)
8. 05:23 PM - Posting dwg drawings or pdf images to a website for other builders to view (David Carter)
9. 05:36 PM - Re: Transformer (Richard E. Tasker)
10. 06:08 PM - Re: Posting dwg drawings or pdf images to a website for other builders to view (Jon Finley)
11. 06:12 PM - Re: Transformer (Ron Koyich)
12. 06:22 PM - Re: Posting dwg drawings or pdf images to a website for other builders to view (Jon Finley)
13. 07:15 PM - SCR for a Hobbs meter (Tom Brusehaver)
14. 07:19 PM - Re: Posting dwg drawings or pdf images to a website for other builders to view (cgalley)
15. 07:52 PM - Re: OV protection for PM alternators (Robert L. Nuckolls, III)
16. 07:55 PM - Re: SCR for a Hobbs meter (Robert L. Nuckolls, III)
17. 08:00 PM - Re: OV protection for PM alternators (Ken)
18. 09:10 PM - Re: Posting dwg drawings or pdf images to a website for other builders to view (David Carter)
19. 11:04 PM - RG (Fergus Kyle)
Message 1
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| Subject: | Re: OV protection for PM alternators |
on juliet
--> AeroElectric-List message posted by: Ken <klehman@albedo.net>
Hi David
While it seemed like a good idea to fuse the wires from the PM
alternator I don't think that accomplishes anything. If the fuse(s) can
handle max alternator output then they likely won't pop if the regulator
develops a short. A fuse on the output of the VR would protect the VR
from excessive battery sourced current though in the event of a VR
short. That is why I was musing that it might be better to put the OV
disconnect relay on the alternator output wires. I still don't know if a
VR short is in fact a significant risk on a John Deere VR though...
For what it's worth I'm finding that the architecture diagrams have to
considered together with component placement. ie. Which side of the
firewall is the component and how long will the wires be. That largely
made the decision for me whether to use manual or electric contactors
for instance. And the components don't always seem to fit where I
planned them either ;)
Ken
David Carter wrote:
>--> AeroElectric-List message posted by: "David Carter"
<dcarter@datarecall.net>
>
>Ken,
>
>I was up past midnight last night (this morning) modifying my Z-13.
>Elimintated the starter contactor and removed jumper between top of
solenoid
>& side and ran wire from starter switch to side of solenoid.
Eliminated PM
>Alternator Sw (just grounded bottom of 5 amp CB associated with OVM).
Then
>I started working on the PM alternator circuitry - spent lot of time
moving
>the OVM stuff way off to right of diagram to make room to shift other
stuff
>left. Was planning to insert the OVM in between the PM Alt and the VR -
>then realized - "That stuff coming out of the alternator is not
regulated -
>so why would I put an OVM in there!!??" My mental "what if'ing" and
>"analysis" still lacks something - I hope it is ONLY lack of
experience with
>this electrical stuff and that I'll get better. I then clicked "Undo"
a LOT
>to return the OVM to original place in Z-13 and quit for the night.
>
>Someone else suggested fusing the 2 AC wires between the PM alternator
& its
>VR - sounds OK to me as long as we don't introduce a corrosion, high
>resistance, failure point. Solder in a "fusable link" or "fusable
wire" or
>connect in an ANL limiter or some such - I need to re-read the
Aeroelectric
>Connection about those things.
>
>
Message 2
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| Subject: | Re: Off Topic....Quo Vadis? |
--> AeroElectric-List message posted by: beecho@beecho.org
Hi Eric
I see you have considered San Luis Obispo. Great place, a truly wonderful climate
and two home building groups. The one in Paso Robles a bit North is much more
active and on a great non towered airport. (PRB) As in most of Southern
CA, home prices are excessive. We can use your expertise!!
Tom Friedland, Atascadero CA Europa mono/Jabiru N96V
----- Original Message -----
From: Walter Tondu <walter@tondu.com>
Subject: Re: AeroElectric-List: Off Topic....Quo Vadis?
--> AeroElectric-List message posted by: Walter Tondu <walter@tondu.com>
On 08/28 7:24, Eric M. Jones wrote:
> --> AeroElectric-List message posted by: "Eric M. Jones" <emjones@charter.net>
>
>
> Life's vicissitudes have marooned me in Massachusetts. (Wife left, cat went
> feral, got fired).
>
> New England is a good place to raise children, and it has good schools,
> lobsters, oaks, proximity to NYC, and a short flight to Europe.
>
> None of these really suit my needs anymore. I am 57 and single again; have
> been running a small business on the internet, and can locate anywhere I
> want. Financially I am okay.
>
> I prefer the West. I have lived in Los Angeles. I love Tucson, but no longer
> know anyone there. I have a sister in Portland Oregon, but they are moving
> in a few years. I have a scattering of friends all over the place. I have
> looked at Prescott, Tucson, LA, San Luis Obispo, Cambria, Eureka, Portland,
> Seattle, Victoria BC. Small towns are better, with some access to big cities
> if necessary.
>
> I dont need much square footage. I need a place to build my Glastar and run
> my little internet business. I would like a very friendly community as well
> as proximity to an active homebuilder group.
>
> QUESTION: Where should I go? Where is the ideal place and why?
North Dallas. Cheap living. Airparks all around. Friendly people.
Close proximity to the big city should you require that. Tons of RVs
too. Not sure about Glastars. See you there in a couple of years.
Oh, you have to like heat, thunderstorms and the occasional hail storm.
> Please contact me offline:
> Eric M. Jones
> www.PerihelionDesign.com
> 113 Brentwood Drive
> Southbridge MA 01550-2705
> Phone (508) 764-2072
> Email: emjones@charter.net
>
>
>
>
>
--
Walter Tondu
http://www.rv7-a.com
Message 3
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--> AeroElectric-List message posted by: "Mickey Billings" <mbilli@cox.net>
Hey guys, does anyone know what the dots represent on a schematic
representing a audio transformer? The transformer is a 8 ohm to 500 ohm at
center taps. Therefore the Secondary has connections 1 2 & 3 with a DOT at
1 & 2 on the schematic. The Primary connections are 4 5 & 6 with a DOT on 4
& 5......I don't know what the dots represent! Can anyone help! The
application is to convert the output on the CD player (8) ohms to the input
on the Flightcom 403 (600) ohms in order to use headphones.
Thanks in advance
Mickey Billings RV7
N445BH
Message 4
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--> AeroElectric-List message posted by: "Richard E. Tasker" <retasker@optonline.net>
The dots mark the phasing of the windings. That is, they mark the
direction of the windings. Or, from an electrical point of view: If
you apply a sine wave to the primary, when the signal waveform is rising
at the dotted end of the primary, it will also be rising at the dotted
end of the secondary.
Assuming you are connecting a CD output to a monaural headphone the dots
make no difference..
However, if you have a stereo CD output you want to connect to stereo
headphones, you will need two transformers and then it makes a
difference. Both transformers should be wired so the dots are
consistent. Connect the transformers so all the dots are connected to
common (or all the opposite). If you connect them differently from each
other your stereo music will sound a little strange - sort of more
spread out.
Dick Tasker
Mickey Billings wrote:
>--> AeroElectric-List message posted by: "Mickey Billings" <mbilli@cox.net>
>
>Hey guys, does anyone know what the dots represent on a schematic
>representing a audio transformer? The transformer is a 8 ohm to 500 ohm at
>center taps. Therefore the Secondary has connections 1 2 & 3 with a DOT at
>1 & 2 on the schematic. The Primary connections are 4 5 & 6 with a DOT on 4
>& 5......I don't know what the dots represent! Can anyone help! The
>application is to convert the output on the CD player (8) ohms to the input
>on the Flightcom 403 (600) ohms in order to use headphones.
>
>Thanks in advance
>Mickey Billings RV7
>N445BH
>
>
Message 5
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--> AeroElectric-List message posted by: "Mickey Billings" <mbilli@cox.net>
Dick, thank you for the quick response. I do have 2 transformers and I am
using it for stereo. So are you saying the dots do not matter as long as I
keep both transformers wired exactly the same?
Mickey Billings
RV7 N45BH
----- Original Message -----
From: "Richard E. Tasker" <retasker@optonline.net>
Subject: Re: AeroElectric-List: Transformer
> --> AeroElectric-List message posted by: "Richard E. Tasker"
<retasker@optonline.net>
>
> The dots mark the phasing of the windings. That is, they mark the
> direction of the windings. Or, from an electrical point of view: If
> you apply a sine wave to the primary, when the signal waveform is rising
> at the dotted end of the primary, it will also be rising at the dotted
> end of the secondary.
>
> Assuming you are connecting a CD output to a monaural headphone the dots
> make no difference..
>
> However, if you have a stereo CD output you want to connect to stereo
> headphones, you will need two transformers and then it makes a
> difference. Both transformers should be wired so the dots are
> consistent. Connect the transformers so all the dots are connected to
> common (or all the opposite). If you connect them differently from each
> other your stereo music will sound a little strange - sort of more
> spread out.
>
> Dick Tasker
>
> Mickey Billings wrote:
>
> >--> AeroElectric-List message posted by: "Mickey Billings"
<mbilli@cox.net>
> >
> >Hey guys, does anyone know what the dots represent on a schematic
> >representing a audio transformer? The transformer is a 8 ohm to 500 ohm
at
> >center taps. Therefore the Secondary has connections 1 2 & 3 with a DOT
at
> >1 & 2 on the schematic. The Primary connections are 4 5 & 6 with a DOT
on 4
> >& 5......I don't know what the dots represent! Can anyone help! The
> >application is to convert the output on the CD player (8) ohms to the
input
> >on the Flightcom 403 (600) ohms in order to use headphones.
> >
> >Thanks in advance
> >Mickey Billings RV7
> >N445BH
> >
> >
>
>
Message 6
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| Subject: | Re: OV protection for PM alternators |
--> AeroElectric-List message posted by: "David Carter" <dcarter@datarecall.net>
Ken, comments and agreement embedded below.
David
----- Original Message -----
From: "Ken" <klehman@albedo.net>
Subject: Re: AeroElectric-List: OV protection for PM alternators on juliet
> --> AeroElectric-List message posted by: Ken <klehman@albedo.net>
>
> Hi David
>
> While it seemed like a good idea to fuse the wires from the PM
> alternator I don't think that accomplishes anything. If the fuse(s) can
> handle max alternator output then they likely won't pop if the regulator
> develops a short.
........Agree
> A fuse on the output of the VR would protect the VR
> from excessive battery sourced current though in the event of a VR
> short.
.........Z-13 already has a fuselink (16awg wire in a 12 awg main
alternator-to-battery circuit) that does what you want - no need to add
anything, i.e., if VR fried and shorted, and there was no longer any output
from "main output" terminal of VR, and output from PM alternator could not
get out of the VR box, and if the postulated short existed in the VR box,
then there would be a massive short from the battery to that new "unplanned"
ground - & the fuselink would do its job and melt.
> That is why I was musing that it might be better to put the OV
> disconnect relay on the alternator output wires.
........I think we agree that we can't see a need for putting anything,
especially the OV system, between PM alternator & regulator.
> I still don't know if a
> VR short is in fact a significant risk on a John Deere VR though...
...........as noted above, we are covered, regardless of risk.
<snip>
> Ken
Message 7
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| Subject: | Re: Switched Pot |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <rnuckolls@aeroelectric.com>
At 07:30 PM 8/27/2004 -0700, you wrote:
>--> AeroElectric-List message posted by: Geoff Evans
><hellothaimassage@yahoo.com>
>
>Bob.
>
>Thanks for the response.
>
> >>
>Don't want lights? Turn them down to min output of 4v and call them "off"
><<
>
>Regarding that.. Does the LM-317 put out more heat at at low voltage output
>(dim) settings or high voltage output (bright) settings?
>
>If it makes more heat at high settings, then no problem. If it makes more
>heat at low settings, then will having the LM-317 and heatsink setting there
>cooking 75% of the time result in any problems?
Not if the heatsink is adequate.
If an adjustable regulator like the LM317 were driving a purely
resistive load, then output current is directly proportional to
output voltage. In this case, power dissipated in the LM317
peaks and is equal to power in load when output voltage
is 1/2 the supply voltage.
Since the lamp's voltage resistance characteristics are
not linear, then driving a bank of lamps with a linear
regulator has a characteristic something like this:
Volts Volts Amps Watts Watts
In Lamp Total Reg Lamp
14.0 1.0 .14 1.82 .14
14.0 2.0 .17 2.04 .34
14.0 3.0 .19 2.09 .57
14.0 4.0 .21 2.10 .84
14.0 5.0 .24 2.16 1.2
14.0 6.0 .26 2.08 1.7
14.0 7.0 .28 1.96 1.96
14.0 8.0 .29 1.74 2.32
14.0 9.0 .31 1.55 2.79
14.0 10.0 .33 1.32 3.30
14.0 11.0 .34 1.02 3.74
14.0 12.0 .36 0.72 4.32
14.0 13.0 .37 0.37 4.81
14.0 14.0 .39 0.0 5.46
With this particular lamp load, it's easy to see that
power dissipated in the regulator peaks at something
on the order of 35% of full output due effects of
lamp's strong positive temperature coefficient of
resistance. This exercise also demonstrates
the fact that peak power dissipated in the regulator
is less than 1/2 total power for the lamps.
So, a lamp load of say 1.5 amps (21 watts) would
be expected to produce a maximum power dissipation
in the controller of less than 10 watts. This value
is what sizes the heat sink.
Bob . . .
---
Message 8
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| Subject: | Posting dwg drawings or pdf images to a website for |
other builders to view
--> AeroElectric-List message posted by: "David Carter" <dcarter@datarecall.net>
I have an unsophisticated website and am trying to learn how to add stuff to
it. I can post .jpg stuff OK. Today, I tried posting a .dwg file (my mod
to Z-13) - it wouldn't open with Autocad (actually, Intellicad clone of
Autocad). Converted to .pdf and uploaded - still won't display. I think I
don't have the source coding for that image correct in my "Builder's Log".
My website url for that page is
http://www.datarecall.net/~dcarter/Builder's%20Log.html
- Anyone have either of these type images posted - I'd like to go to
your site and "copy source" and see how you do it.
David
Message 9
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--> AeroElectric-List message posted by: "Richard E. Tasker" <retasker@optonline.net>
Yes, that is correct!
Dick
Mickey Billings wrote:
>--> AeroElectric-List message posted by: "Mickey Billings" <mbilli@cox.net>
>
>Dick, thank you for the quick response. I do have 2 transformers and I am
>using it for stereo. So are you saying the dots do not matter as long as I
>keep both transformers wired exactly the same?
>
>Mickey Billings
>RV7 N45BH
>
>----- Original Message -----
>From: "Richard E. Tasker" <retasker@optonline.net>
>To: <aeroelectric-list@matronics.com>
>Subject: Re: AeroElectric-List: Transformer
>
>
>
>
>>--> AeroElectric-List message posted by: "Richard E. Tasker"
>>
>>
><retasker@optonline.net>
>
>
>>The dots mark the phasing of the windings. That is, they mark the
>>direction of the windings. Or, from an electrical point of view: If
>>you apply a sine wave to the primary, when the signal waveform is rising
>>at the dotted end of the primary, it will also be rising at the dotted
>>end of the secondary.
>>
>>Assuming you are connecting a CD output to a monaural headphone the dots
>>make no difference..
>>
>>However, if you have a stereo CD output you want to connect to stereo
>>headphones, you will need two transformers and then it makes a
>>difference. Both transformers should be wired so the dots are
>>consistent. Connect the transformers so all the dots are connected to
>>common (or all the opposite). If you connect them differently from each
>>other your stereo music will sound a little strange - sort of more
>>spread out.
>>
>>Dick Tasker
>>
>>Mickey Billings wrote:
>>
>>
>>
>>>--> AeroElectric-List message posted by: "Mickey Billings"
>>>
>>>
><mbilli@cox.net>
>
>
>>>Hey guys, does anyone know what the dots represent on a schematic
>>>representing a audio transformer? The transformer is a 8 ohm to 500 ohm
>>>
>>>
>at
>
>
>>>center taps. Therefore the Secondary has connections 1 2 & 3 with a DOT
>>>
>>>
>at
>
>
>>>1 & 2 on the schematic. The Primary connections are 4 5 & 6 with a DOT
>>>
>>>
>on 4
>
>
>>>& 5......I don't know what the dots represent! Can anyone help! The
>>>application is to convert the output on the CD player (8) ohms to the
>>>
>>>
>input
>
>
>>>on the Flightcom 403 (600) ohms in order to use headphones.
>>>
>>>Thanks in advance
>>>Mickey Billings RV7
>>>N445BH
>>>
>>>
>>>
>>>
>>
>>
>
>
>
>
Message 10
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| Subject: | Posting dwg drawings or pdf images to a website |
for other builders to view
--> AeroElectric-List message posted by: "Jon Finley" <jon@finleyweb.net>
Hi David,
Lots of good HTML help online but to get you started:
The images that you have on your page are "shown" thru the use of an IMG
(image tag). One of your links is:
<img src="/%7Edcarter/PhotoAlbum/ElevTrim3.jpg"
alt="CableComingOutOfTunnelInBagArea" width="288" height="216">
Typical image type (jpg, bmp, gif, etc...) links work as browsers know
how to display these file types. A browser does not know how to display
an ACAD drawing. So, you generally have to display a link to these files
using a hyperlink tag (A :
Q2 Front Hinged Canopy
Most browsers figure out that they don't know how to display this file
so they ask if you would like to open or save the file (if open, what
program to use).
There are a millions of things that can be done via HTML, the key is
finding the thing that works! :-)
Jon Finley
N90MG Q2 - Subaru EJ-22 DD - 461 Hrs. TT
Apple Valley, Minnesota
http://www.FinleyWeb.net/Q2Subaru
> -----Original Message-----
> From: owner-aeroelectric-list-server@matronics.com
> [mailto:owner-aeroelectric-list-server@matronics.com] On
> Behalf Of David Carter
> Sent: Sunday, August 29, 2004 7:22 PM
> To: aeroelectric-list
> Subject: AeroElectric-List: Posting dwg drawings or pdf
> images to a website for other builders to view
>
>
> --> AeroElectric-List message posted by: "David Carter"
> --> <dcarter@datarecall.net>
>
> I have an unsophisticated website and am trying to learn how
> to add stuff to it. I can post .jpg stuff OK. Today, I
> tried posting a .dwg file (my mod to Z-13) - it wouldn't open
> with Autocad (actually, Intellicad clone of Autocad).
> Converted to .pdf and uploaded - still won't display. I
> think I don't have the source coding for that image correct
> in my "Builder's Log". My website url for that page is
> http://www.datarecall.net/~dcarter/Builder's%20Log.html
> - Anyone have either of these type images posted - I'd
> like to go to your site and "copy source" and see how you do it.
>
> David
Message 11
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--> AeroElectric-List message posted by: "Ron Koyich" <Ron@Koyich.com>
I just have to ask: why are folks are still using transformers for audio
distribution in aircraft (or ??)
Message 12
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| Subject: | Posting dwg drawings or pdf images to a website |
for other builders to view
--> AeroElectric-List message posted by: "Jon Finley" <jon@finleyweb.net>
That hyperlink didn't come thru so well! :-)
One more try, with quotes this time (don't include the quotes in your
html):
"File to upload"
Jon
DO NOT ARCHIVE
> -----Original Message-----
> From: owner-aeroelectric-list-server@matronics.com
> [mailto:owner-aeroelectric-list-server@matronics.com] On
> Behalf Of Jon Finley
> Sent: Sunday, August 29, 2004 8:08 PM
> To: aeroelectric-list@matronics.com
> Subject: RE: AeroElectric-List: Posting dwg drawings or pdf
> images to a website for other builders to view
>
>
> --> AeroElectric-List message posted by: "Jon Finley"
> --> <jon@finleyweb.net>
>
> Hi David,
>
> Lots of good HTML help online but to get you started:
>
> The images that you have on your page are "shown" thru the
> use of an IMG (image tag). One of your links is:
>
> <img src="/%7Edcarter/PhotoAlbum/ElevTrim3.jpg"
> alt="CableComingOutOfTunnelInBagArea" width="288" height="216">
>
> Typical image type (jpg, bmp, gif, etc...) links work as
> browsers know how to display these file types. A browser does
> not know how to display an ACAD drawing. So, you generally
> have to display a link to these files using a hyperlink tag (A :
>
> Q2 Front Hinged Canopy
>
> Most browsers figure out that they don't know how to display
> this file so they ask if you would like to open or save the
> file (if open, what program to use).
>
> There are a millions of things that can be done via HTML, the
> key is finding the thing that works! :-)
>
> Jon Finley
> N90MG Q2 - Subaru EJ-22 DD - 461 Hrs. TT
> Apple Valley, Minnesota
> http://www.FinleyWeb.net/Q2Subaru
Message 13
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| Subject: | SCR for a Hobbs meter |
--> AeroElectric-List message posted by: Tom Brusehaver <cozytom@mn.rr.com>
I'm finishing a canard aircraft, and am about to hook up
the hobbs meter. Electric tach, so I don't have another
hour meter.
I don't like the extra oil pressure lines, Tee's and
wiring. Seems like one more place to have a leak
and more stuff to put in the back of the plane.
I am thinking of using an SCR to trigger the start of
the Hobbs meter. The trigger would be the starter switch.
Simple, light weight, and relable.
It does risk leaving the master switch on, and having
a few extra hours added to the time. Hopefully I'll
actually use a shutdown checklist everytime, and that
won't happen.
Message 14
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| Subject: | Re: Posting dwg drawings or pdf images to a website |
for other builders to view
--> AeroElectric-List message posted by: "cgalley" <cgalley@qcbc.org>
I use PDFs all the time for forms on www.qcbc.org. Click on the left hand
Heartland Century link. You do have to have adobe Acrobat reader installed
to see a PDF. The newsletter link has a link to Adobe's site to get the free
reader.
As the reader has to load before display of the PDF, it takes a while and
sometime you might think it isn't working because ot the time lag.
Cy Galley - Webmaster www.qcbc.org
----- Original Message -----
From: "David Carter" <dcarter@datarecall.net>
Subject: AeroElectric-List: Posting dwg drawings or pdf images to a website
for other builders to view
> --> AeroElectric-List message posted by: "David Carter"
<dcarter@datarecall.net>
>
> I have an unsophisticated website and am trying to learn how to add stuff
to
> it. I can post .jpg stuff OK. Today, I tried posting a .dwg file (my mod
> to Z-13) - it wouldn't open with Autocad (actually, Intellicad clone of
> Autocad). Converted to .pdf and uploaded - still won't display. I think
I
> don't have the source coding for that image correct in my "Builder's Log".
> My website url for that page is
> http://www.datarecall.net/~dcarter/Builder's%20Log.html
> - Anyone have either of these type images posted - I'd like to go to
> your site and "copy source" and see how you do it.
>
> David
>
>
Message 15
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| Subject: | Re: OV protection for PM alternators |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <b.nuckolls@cox.net>
At 06:12 PM 8/29/2004 -0500, you wrote:
>--> AeroElectric-List message posted by: "David Carter"
><dcarter@datarecall.net>
>
>Ken, comments and agreement embedded below.
>
>David
>
>----- Original Message -----
>From: "Ken" <klehman@albedo.net>
>To: <aeroelectric-list@matronics.com>
>Subject: Re: AeroElectric-List: OV protection for PM alternators on juliet
>
>
> > --> AeroElectric-List message posted by: Ken <klehman@albedo.net>
> >
> > Hi David
> >
> > While it seemed like a good idea to fuse the wires from the PM
> > alternator I don't think that accomplishes anything. If the fuse(s) can
> > handle max alternator output then they likely won't pop if the regulator
> > develops a short.
>
>........Agree
Alternators never pop their own fuses. Note that the fusible link
is at the BUS END of the feeder. The fusible link protects the
feeder from current that comes from the BATTERY . . . not the alternator.
> > A fuse on the output of the VR would protect the VR
> > from excessive battery sourced current though in the event of a VR
> > short.
>
>.........Z-13 already has a fuselink (16awg wire in a 12 awg main
>alternator-to-battery circuit) that does what you want - no need to add
>anything, i.e., if VR fried and shorted, and there was no longer any output
>from "main output" terminal of VR, and output from PM alternator could not
>get out of the VR box, and if the postulated short existed in the VR box,
>then there would be a massive short from the battery to that new "unplanned"
>ground - & the fuselink would do its job and melt.
>
> > That is why I was musing that it might be better to put the OV
> > disconnect relay on the alternator output wires.
This would work fine too . . .
>........I think we agree that we can't see a need for putting anything,
>especially the OV system, between PM alternator & regulator.
>
> > I still don't know if a
> > VR short is in fact a significant risk on a John Deere VR though...
>
>...........as noted above, we are covered, regardless of risk.
Put the relay where ever it suits you to disconnect the alternator
in the event of regulator failure.
Bob . . .
---
Message 16
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| Subject: | Re: SCR for a Hobbs meter |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <b.nuckolls@cox.net>
At 04:14 PM 8/29/2004 -0500, you wrote:
>--> AeroElectric-List message posted by: Tom Brusehaver <cozytom@mn.rr.com>
>
>
>I'm finishing a canard aircraft, and am about to hook up
>the hobbs meter. Electric tach, so I don't have another
>hour meter.
>
>I don't like the extra oil pressure lines, Tee's and
>wiring. Seems like one more place to have a leak
>and more stuff to put in the back of the plane.
These have been pretty trouble free and the price
is right.
>I am thinking of using an SCR to trigger the start of
>the Hobbs meter. The trigger would be the starter switch.
>Simple, light weight, and relable.
>
>It does risk leaving the master switch on, and having
>a few extra hours added to the time. Hopefully I'll
>actually use a shutdown checklist everytime, and that
>won't happen.
It's pretty easy to build an "engine running" detector
for your tach signal line that will run the Hobbs only
while the engine is rotating above a certain speed.
Bob . . .
---
Message 17
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| Subject: | Re: OV protection for PM alternators |
on juliet
--> AeroElectric-List message posted by: Ken <klehman@albedo.net>
David
Actually I don't think we are seeing the same thing here.
Unless someone sees a problem with it, I am indeed going to put the OV
relay disconnect contacts between the alternator and the regulator. That
would enable me to manually stop the current flow from the alternator to
the Regulator if I should notice that the John Deere regulator above my
right foot is smoking. The Z-13 fuselink might already be melted at that
point due to a VR problem and I'm postulating that it makes sense to
insure that the alternator can't still feed 20 amps into the failed and
smoking regulator.
In fact with our discussion I now realize that since I've use a circuit
breaker instead of the Z-13 fuselink I can also pull that to manually
disconnect the battery from the VR if it doesn't pop by itself so I
think this is an improvement.
Ken
>.........Z-13 already has a fuselink (16awg wire in a 12 awg main
>alternator-to-battery circuit) that does what you want - no need to add
>anything, i.e., if VR fried and shorted, and there was no longer any output
>from "main output" terminal of VR, and output from PM alternator could not
>get out of the VR box, and if the postulated short existed in the VR box,
>then there would be a massive short from the battery to that new "unplanned"
>ground - & the fuselink would do its job and melt.
>
>
>
>> That is why I was musing that it might be better to put the OV
>>disconnect relay on the alternator output wires.
>>
>>
>
>........I think we agree that we can't see a need for putting anything,
>especially the OV system, between PM alternator & regulator.
>
>
>
>>I still don't know if a
>>VR short is in fact a significant risk on a John Deere VR though...
>>
>>
>
>...........as noted above, we are covered, regardless of risk.
>
>
Message 18
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| Subject: | Re: Posting dwg drawings or pdf images to a website |
for other builders to view
--> AeroElectric-List message posted by: "David Carter" <dcarter@datarecall.net>
Jon Finley & Cy Galley,
Thanks for the excellent tips. Just what I needed. I'll digest this stuff
tomorrow and mod my website until it works.
David
----- Original Message -----
From: "cgalley" <cgalley@qcbc.org>
<dcarter@datarecall.net>
Subject: Re: AeroElectric-List: Posting dwg drawings or pdf images to a
website for other builders to view
> --> AeroElectric-List message posted by: "cgalley" <cgalley@qcbc.org>
>
> I use PDFs all the time for forms on www.qcbc.org. Click on the left hand
> Heartland Century link. You do have to have adobe Acrobat reader
installed
> to see a PDF. The newsletter link has a link to Adobe's site to get the
free
> reader.
>
> As the reader has to load before display of the PDF, it takes a while and
> sometime you might think it isn't working because ot the time lag.
>
> Cy Galley - Webmaster www.qcbc.org
>
> ----- Original Message -----
> From: "David Carter" <dcarter@datarecall.net>
> To: "aeroelectric-list" <aeroelectric-list@matronics.com>
> Subject: AeroElectric-List: Posting dwg drawings or pdf images to a
website
> for other builders to view
>
>
> > --> AeroElectric-List message posted by: "David Carter"
> <dcarter@datarecall.net>
> >
> > I have an unsophisticated website and am trying to learn how to add
stuff
> to
> > it. I can post .jpg stuff OK. Today, I tried posting a .dwg file (my
mod
> > to Z-13) - it wouldn't open with Autocad (actually, Intellicad clone of
> > Autocad). Converted to .pdf and uploaded - still won't display. I
think
> I
> > don't have the source coding for that image correct in my "Builder's
Log".
> > My website url for that page is
> > http://www.datarecall.net/~dcarter/Builder's%20Log.html
> > - Anyone have either of these type images posted - I'd like to go
to
> > your site and "copy source" and see how you do it.
> >
> > David
> >
> >
>
>
Message 19
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|
--> AeroElectric-List message posted by: "Fergus Kyle" <VE3LVO@rac.ca>
Time: 08:10:39 PM PST US
From: "Dan Checkoway" <dan@rvproject.com>
Subject: Re: AeroElectric-List: BNC Connector
--> AeroElectric-List message posted by: "Dan Checkoway" <dan@rvproject.com>
> PPS: Extra credit goes to the first student who posts what the letters RG
stand for on the coax cable used with these connectors.
Ooh, me, me, me, me! (hand raised)
RG=Radio Guide
(dogpile toolbar is cool)
do not archive
)_( Dan
damn
Ferg
do not archive
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