Today's Message Index:
----------------------
1. 02:48 AM - Re: (Robert L. Nuckolls, III)
2. 02:59 AM - SPA-400 wiring (Peter Mather)
3. 05:25 AM - Re: SPA-400 wiring (Vernon Little)
4. 07:22 AM - Re: (Dj Merrill)
5. 10:52 AM - Re: (Robert L. Nuckolls, III)
6. 12:05 PM - Re: Wing Wiring Clamps and Brackets (Eric M. Jones)
7. 12:09 PM - Re: (Aaron Gustafson)
8. 12:23 PM - Proper Wire Size for 60 Amp Alt? Aeroelectric Discrepancy? (tx_jayhawk)
9. 01:18 PM - Re: Wing Wiring Clamps and Brackets (messydeer)
10. 01:31 PM - Battery Question? (BobsV35B@aol.com)
11. 02:22 PM - Re: Battery Question? (BobsV35B@aol.com)
12. 02:38 PM - Re: Battery Question? (BobsV35B@aol.com)
13. 03:29 PM - Re: Wing Wiring Clamps and Brackets (Eric M. Jones)
14. 03:32 PM - Re: Battery Question? (Richard T. Schaefer)
15. 03:33 PM - Re: Proper Wire Size for 60 Amp Alt? Aeroelectric Discrepancy? (Robert L. Nuckolls, III)
16. 07:58 PM - Re: Battery Question? (Robert L. Nuckolls, III)
17. 08:07 PM - Re: Battery Question? (Robert L. Nuckolls, III)
18. 08:41 PM - Re: Battery Question? (BobsV35B@aol.com)
19. 08:45 PM - Re: Battery Question? (BobsV35B@aol.com)
20. 09:55 PM - Re: Battery Question? (Robert L. Nuckolls, III)
21. 09:55 PM - Re: Battery Question? (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: ectric-List: |
At 08:51 PM 12/15/2007 -0500, you wrote:
>
>Robert L. Nuckolls, III wrote:
>
> >>>>> heat shrink and hot gun trick that you've published to make
> >>>>> connections <<<
> >>
>
> >
> > Don't recognize the sentence. In what context was
> > it used? I.e., where did you see it published.
> >
>
>Hi Bob,
> It is published on your website at
>http://www.aeroelectric.com/articles/macservo/macservo.html
Okay, what is your question?
Bob . . .
Message 2
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Hi all
I'm installing a Sigtronics SPA-400 intercom and need help on a couple of
questions.
First the intercomunit only has one ground connection rather than a separate
power ground and an avionics ground. The radio has both. My plan is to
create an avionics ground plane using a DSUB adjacent to the intercom, wire
this to the power ground and then terminate the intercom's only ground and
the radio avionics ground on this - does this make sense? What should I use
as the shield on the wires to the radio - a separate connections to the
avionics ground plane left unterminated at the radio?
Secondly, based on the Sigtronics wiring diagram, the headphone output from
the SPA-400 ties directly to the headphone output from the radio and all of
the headphone sockets hang off this conection. Every other intercom/audio
panel I've seen has the radio headphone output as an input and then has one
or more separate outputs for the phone sockets. How does this work ifor the
SPA-400? Is the SPA-400 making some assumptions about the electrical
characteristics of headphone output of the radio? It seems odd to be tying
two outputs together but since there are so many SPA-400's around I assume
its OK?
Any comments gratefully appreciated
Best Regards
Peter
Message 3
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Hi Peter, the SPA-400 works fine as long as you follow their appnotes. Most
comm radios will require a resistor (500 ohms or so) in series with the
output in order to function properly. The Sigtronics intercoms use a
passive bus technique which has the advantage of working even with an
electrical failure in the intercom circuit. As with most intercoms, wiring
all of those shielded wires is a major pain.
You can check out the AMX-1A from Vx Aviation here: http://vx-aviation.com/
It solves all of the grounding and matching required to connect a number of
different audio sources, and makes shield connections simple. It' sold by
Aircraft Extras http://www.aircraftextras.com
Thanks,
Vern Little
RV-9A
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Peter
Mather
Sent: December 16, 2007 2:59 AM
Subject: AeroElectric-List: SPA-400 wiring
--> <peter@mather.com>
Hi all
I'm installing a Sigtronics SPA-400 intercom and need help on a couple of
questions.
First the intercomunit only has one ground connection rather than a separate
power ground and an avionics ground. The radio has both. My plan is to
create an avionics ground plane using a DSUB adjacent to the intercom, wire
this to the power ground and then terminate the intercom's only ground and
the radio avionics ground on this - does this make sense? What should I use
as the shield on the wires to the radio - a separate connections to the
avionics ground plane left unterminated at the radio?
Secondly, based on the Sigtronics wiring diagram, the headphone output from
the SPA-400 ties directly to the headphone output from the radio and all of
the headphone sockets hang off this conection. Every other intercom/audio
panel I've seen has the radio headphone output as an input and then has one
or more separate outputs for the phone sockets. How does this work ifor the
SPA-400? Is the SPA-400 making some assumptions about the electrical
characteristics of headphone output of the radio? It seems odd to be tying
two outputs together but since there are so many SPA-400's around I assume
its OK?
Any comments gratefully appreciated
Best Regards
Peter
Message 4
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| Subject: | Re: ectric-List: |
Robert L. Nuckolls, III wrote:
>> Hi Bob,
>> It is published on your website at
>> http://www.aeroelectric.com/articles/macservo/macservo.html
>
> Okay, what is your question?
>
> Bob . . .
A bit of confusion here I think... :-)
I mentioned using the heat shrink and glue approach using the 9 pin
D-subs in a post to you, and someone else asked where that information
was located since they could not find it in your book, and I replied
with the link to the website. You then asked where it was published, so
I just responded to your question...
-Dj
--
Dj Merrill
Sportsman 2+2 Builder #7118
http://deej.net/sportsman/
"Many things that are unexplainable happen during the construction of an
airplane." --Dave Prizio, 30 Aug 2005
Message 5
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| Subject: | Re: ectric-List: |
At 10:21 AM 12/16/2007 -0500, you wrote:
>
>Robert L. Nuckolls, III wrote:
>
> >> Hi Bob,
> >> It is published on your website at
> >> http://www.aeroelectric.com/articles/macservo/macservo.html
> >
> > Okay, what is your question?
> >
> > Bob . . .
>
> A bit of confusion here I think... :-)
Yup, I can usually keep 3 or 4 balls in the air at
once but I think I dropped one this time. Thanks!
Bob . . .
Message 6
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| Subject: | Re: Wing Wiring Clamps and Brackets |
I sell the Panduit LHMS "Lightening Hole Mounting Saddles" on my website to do
this wiring job. See:
http://www.periheliondesign.com/glastarparts.htm
I don't know who talked Panduit into making these-- they sell very few of these
per year. Panduit usually won't touch a part if they can't sell billions.
Free sample on prospect of selling a hundred or so.
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones@charter.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=152543#152543
Message 7
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| Subject: | Re: ectric-List: |
Thanks, Bob & Dj.
Aaron
----- Original Message -----
From: "Dj Merrill" <deej@deej.net>
Sent: Saturday, December 15, 2007 7:51 PM
Subject: Re: AeroElectric-List:
> Robert L. Nuckolls, III wrote:
>>>>>> heat shrink and hot gun trick that you've published to make
>>>>>> connections <<<
>> Don't recognize the sentence. In what context was
>> it used? I.e., where did you see it published.
> Hi Bob,
> It is published on your website at
> http://www.aeroelectric.com/articles/macservo/macservo.html
Message 8
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| Subject: | Proper Wire Size for 60 Amp Alt? Aeroelectric Discrepancy? |
I'm assuming this is a misprint in the book, but the discrepancy is causing me
to pause and question...
What is the proper B-lead wire size for a 60 amp alt (assuming everything is mounted
FW forward and wire lengths are "std")?
My copy of AC 43.13 says 6 AWG should be protected by 80 amps on CB and 70 amps
on fuse, and it seems 6 should be appropriate.
My Aeroelectric book rev 10A (and several current downloadable drawings) shows
6 AWG on some drawings with 60 amp (ref Z-12) and 4 AWG on others (ref Z-13).
In fact, Z-14 shows 4 AWG with a 40 amp alternator.
Given we know alternators are current limited (don't go above their rating...SD-20
aside), what would be the purpose to have 4 AWG in the above cases? Or, am
I correct to assume they are misprints?
Thanks,
Scott
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=152549#152549
Message 9
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| Subject: | Re: Wing Wiring Clamps and Brackets |
Looks interesting, Eric.
Does it provide the required 3/8" stand-off from the edge of the metal? I have
13 ribs per wing, so for the wires I'd only need 26. Maybe more if I could adapt
them to safely securing the 2 pitot tube lines. So 40 is the most I'd need
and would be happy with a sample.
Cheers,
Dan
--------
Dan
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=152556#152556
Message 10
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| Subject: | Battery Question? |
Good Afternoon,
I am sure this information is available somewhere in 'Lectric Bob's
extensive library, but my searching skills are almost non existent.
I have the need for a twenty-eight volt battery set up for testing purposes.
I would imagine something that would supply ten to fifteen ampere hours
would be more than enough.
I do have several controllable bench power supplies to provide reasonable
amperage and voltage, but a couple of twelve volt units in parallel would give
me a nice stabilizing and cushioning device.
Could any one suggest a source of low cost batteries that might be suitable
for use with a bench power supply?
Happy Skies,
Old Bob
AKA
Bob Siegfried
Ancient Aviator
Stearman N3977A
Brookeridge Air Park LL22
Downers Grove, IL 60516
630 985-8503
**************************************See AOL's top rated recipes
(http://food.aol.com/top-rated-recipes?NCID=aoltop00030000000004)
Message 11
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| Subject: | Re: Battery Question? |
Good Afternoon All,
Just as an addendum to my previous request, I did a google search and came
up with something I thought may work.
Interstate Batteries lists a Power Patrol battery that seems about the right
size. It is listed as being a 7.5 AH battery with a potential of handling 80
amps for up to five seconds and fifty amps continuously (For not long I would
suppose!)
They also have a nice, though more expensive, unit that has an 18 AH rating
and can handle 250 amps for five seconds, eighty amps continuously.
The big one would probably even handle a gear retraction or two!
I am leaning toward the purchase of a couple of the smaller ones. Any
comments at all?
Happy Skies,
Old Bob
AKA
Bob Siegfried
Ancient Aviator
Stearman N3977A
Brookeridge Air Park LL22
Downers Grove, IL 60516
630 985-8503
In a message dated 12/16/2007 3:33:44 P.M. Central Standard Time,
BobsV35B@aol.com writes:
Could any one suggest a source of low cost batteries that might be suitable
for use with a bench power supply?
**************************************See AOL's top rated recipes
(http://food.aol.com/top-rated-recipes?NCID=aoltop00030000000004)
Message 12
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| Subject: | Re: Battery Question? |
OOOPS!!
Should have said series as in:
"I do have several controllable bench power supplies to provide reasonable
amperage and voltage, but a couple of twelve volt units in series would give
me a nice stabilizing and cushioning device."
Happy Skies,
Old Bob
AKA
Bob Siegfried
Ancient Aviator
Stearman N3977A
Brookeridge Air Park LL22
Downers Grove, IL 60516
630 985-8503
In a message dated 12/16/2007 3:33:44 P.M. Central Standard Time,
BobsV35B@aol.com writes:
I do have several controllable bench power supplies to provide reasonable
amperage and voltage, but a couple of twelve volt units in parallel would give
me a nice stabilizing and cushioning device.
**************************************See AOL's top rated recipes
(http://food.aol.com/top-rated-recipes?NCID=aoltop00030000000004)
Message 13
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| Subject: | Re: Wing Wiring Clamps and Brackets |
> Posted: Sun Dec 16, 2007 3:15 pm Post subject: Re: Wing Wiring Clamps and
Brackets Looks interesting, Eric.
> So 40 is the most I'd need and would be happy with a sample.
>
> Cheers,
> Dan
Dan, send address and email me offlist at emjones@charter.net
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones@charter.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=152580#152580
Message 14
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| Subject: | Battery Question? |
You can get 12V 7.5 Amp/Hour batteries in lots of places cheap.
They are used for:
Emergency Exit Signs and Uninterruptable Power Supply (UPS) for
computers.
Check at your local big box hardware store in the electrical department or a
local electrical or lighting supply house or check if there is a Batteries R
US (Or something like that) near you.
Series for big volts, parallel for big amps :-)
r.t.s.
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
BobsV35B@aol.com
Sent: Sunday, December 16, 2007 4:36 PM
Subject: Re: AeroElectric-List: Battery Question?
OOOPS!!
Should have said series as in:
"I do have several controllable bench power supplies to provide reasonable
amperage and voltage, but a couple of twelve volt units in series would give
me a nice stabilizing and cushioning device."
Happy Skies,
Old Bob
AKA
Bob Siegfried
Ancient Aviator
Stearman N3977A
Brookeridge Air Park LL22
Downers Grove, IL 60516
630 985-8503
In a message dated 12/16/2007 3:33:44 P.M. Central Standard Time,
BobsV35B@aol.com writes:
I do have several controllable bench power supplies to provide reasonable
amperage and voltage, but a couple of twelve volt units in parallel would
give me a nice stabilizing and cushioning device.
_____
See AOL's top
<http://food.aol.com/top-rated-recipes?NCID=aoltop00030000000004> rated
recipes and easy
<http://body.aol.com/fitness/winter-exercise?NCID=aoltop00030000000003>
ways to stay in shape for winter.
Message 15
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| Subject: | Re: Proper Wire Size for 60 Amp Alt? Aeroelectric |
Discrepancy?
At 12:14 PM 12/16/2007 -0800, you wrote:
>
>I'm assuming this is a misprint in the book, but the discrepancy is
>causing me to pause and question...
>
>What is the proper B-lead wire size for a 60 amp alt (assuming everything
>is mounted FW forward and wire lengths are "std")?
>
>My copy of AC 43.13 says 6 AWG should be protected by 80 amps on CB and 70
>amps on fuse, and it seems 6 should be appropriate.
>
>My Aeroelectric book rev 10A (and several current downloadable drawings)
>shows 6 AWG on some drawings with 60 amp (ref Z-12) and 4 AWG on others
>(ref Z-13). In fact, Z-14 shows 4 AWG with a 40 amp alternator.
>
>Given we know alternators are current limited (don't go above their
>rating...SD-20 aside), what would be the purpose to have 4 AWG in the
>above cases? Or, am I correct to assume they are misprints?
The Z-figures are ARCHITECTURE drawings and not
intended to specify the size of anything. Having
said that, I would wire with 4AWG for all fat wires
'cause it's easily acquired at the welding supply
store in nice, soft and easily worked wire. But
if it rings your chimes to chase down a piece of
6AWG for that short run of wire, that's certainly
okay too.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
Message 16
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| Subject: | Re: Battery Question? |
At 05:20 PM 12/16/2007 -0500, you wrote:
>Good Afternoon All,
>
>Just as an addendum to my previous request, I did a google search and came
>up with something I thought may work.
>
>Interstate Batteries lists a Power Patrol battery that seems about the
>right size. It is listed as being a 7.5 AH battery with a potential of
>handling 80 amps for up to five seconds and fifty amps continuously (For
>not long I would suppose!)
>
>They also have a nice, though more expensive, unit that has an 18 AH
>rating and can handle 250 amps for five seconds, eighty amps continuously.
>
>The big one would probably even handle a gear retraction or two!
>
>I am leaning toward the purchase of a couple of the smaller ones. Any
>comments at all?
Can your power supplies be cranked up to 14.2 or thereabouts?
Also, you need to check and see how much (if any) current
flows back into the power supplies when they are powered-down
and still connected to batteries.
Using batteries to augment bench supplies is not an unreasonable
thing to consider. We used to do it in the two-way radio
business all the time. Most radios ran nicely in the receive
mode from a modest power supply but took 20+ Amps for
some of the big honkers. We would float a battery across
the power supply for temporary support of very intermittent
loads.
What kind of work are you wanting to accomplish with this
supply? If it's a relatively low priority, occasional kind
of activity, perhaps the batteries are your best bet . . .
but they are like houseplants . . . you gotta take care
of them.
How much current do you need at 28V . . . or would 24.0
do the job?
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
Message 17
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| Subject: | Re: Battery Question? |
At 05:20 PM 12/16/2007 -0500, you wrote:
>Good Afternoon All,
>
>Just as an addendum to my previous request, I did a google search and came
>up with something I thought may work.
>
>Interstate Batteries lists a Power Patrol battery that seems about the
>right size. It is listed as being a 7.5 AH battery with a potential of
>handling 80 amps for up to five seconds and fifty amps continuously (For
>not long I would suppose!)
>
>They also have a nice, though more expensive, unit that has an 18 AH
>rating and can handle 250 amps for five seconds, eighty amps continuously.
>
>The big one would probably even handle a gear retraction or two!
>
>I am leaning toward the purchase of a couple of the smaller ones. Any
>comments at all?
Toss this idea in the hat. Theres a power supply on
ebay right now at:
http://tinyurl.com/2mzrkk
For a total cost of about $50 you can have a power
supply that will support 15A indefinitely and it's
probably only a little more expensive than a pair
of 7.5AH batteries. The best thing is that you
don't have to water, fertilize or pray over it
either!
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
Message 18
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| Subject: | Re: Battery Question? |
Good Evening Bob,
"Can your power supplies be cranked up to 14.2 or thereabouts?
Also, you need to check and see how much (if any) current
flows back into the power supplies when they are powered-down
and still connected to batteries."
Darned if I know!
The primary one that I hope to use is a variable power supply that is
supposed to be capable of supplying up to 40 volts and 25 amperes. It is a
Hewlett-Packard 6438B which means absolutely nothing to me!
"What kind of work are you wanting to accomplish with this
supply? If it's a relatively low priority, occasional kind
of activity, perhaps the batteries are your best bet . . .
but they are like houseplants . . . you gotta take care
of them."
I would like to use it to check out the aircraft systems.
Primarily electronics, but also the flaps, lights and, maybe, even the
retractable landing gear. My intent is to hook the batteries to the airplane
in
lieu of the standard battery and power the whole thing with the power supply
set at twenty-eight volts.
I hadn't considered leaving the power supply hooked up when not in use, but
it would be interesting to know what would happen. I suppose I could hook an
ammeter inline to see if there is any back flow.
I really have no idea what the intermittent loads will be, but steady state
would rarely exceed fifteen amps. More often five to ten
Happy Skies,
Old Bob
AKA
Bob Siegfried
Ancient Aviator
Stearman N3977A
Brookeridge Air Park LL22
Downers Grove, IL 60516
630 985-8503
In a message dated 12/16/2007 10:03:36 P.M. Central Standard Time,
nuckolls.bob@cox.net writes:
Using batteries to augment bench supplies is not an unreasonable
thing to consider. We used to do it in the two-way radio
business all the time. Most radios ran nicely in the receive
mode from a modest power supply but took 20+ Amps for
some of the big honkers. We would float a battery across
the power supply for temporary support of very intermittent
loads.
How much current do you need at 28V . . . or would 24.0
do the job?
Bob . . .
**************************************See AOL's top rated recipes
(http://food.aol.com/top-rated-recipes?NCID=aoltop00030000000004)
Message 19
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| Subject: | Re: Battery Question? |
Good Evening Bob,
When using that address, I seem to be getting a 24 to 12 converter!
Happy Skies,
Old Bob
AKA
Bob Siegfried
Ancient Aviator
Stearman N3977A
Brookeridge Air Park LL22
Downers Grove, IL 60516
630 985-8503
In a message dated 12/16/2007 10:12:03 P.M. Central Standard Time,
nuckolls.bob@cox.net writes:
Toss this idea in the hat. Theres a power supply on
ebay right now at:
http://tinyurl.com/2mzrkk
**************************************See AOL's top rated recipes
(http://food.aol.com/top-rated-recipes?NCID=aoltop00030000000004)
Message 20
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| Subject: | Re: Battery Question? |
At 11:32 PM 12/16/2007 -0500, you wrote:
>Good Evening Bob,
>
>"Can your power supplies be cranked up to 14.2 or thereabouts?
> Also, you need to check and see how much (if any) current
> flows back into the power supplies when they are powered-down
> and still connected to batteries."
>
>Darned if I know!
>
>The primary one that I hope to use is a variable power supply that is
>supposed to be capable of supplying up to 40 volts and 25 amperes. It is a
>Hewlett-Packard 6438B which means absolutely nothing to me!
Aha! These supplies have a crowbar ov protection
system in them that triggers if you leave them
connected across a battery and remove the incoming
AC power.
>"What kind of work are you wanting to accomplish with this
> supply? If it's a relatively low priority, occasional kind
> of activity, perhaps the batteries are your best bet . . .
> but they are like houseplants . . . you gotta take care
> of them."
>I would like to use it to check out the aircraft systems.
>
>
>Primarily electronics, but also the flaps, lights and, maybe, even the
>retractable landing gear. My intent is to hook the batteries to the
>airplane in lieu of the standard battery and power the whole thing with
>the power supply set at twenty-eight volts.
>
>I hadn't considered leaving the power supply hooked up when not in use,
>but it would be interesting to know what would happen. I suppose I could
>hook an ammeter inline to see if there is any back flow.
>
>I really have no idea what the intermittent loads will be, but steady
>state would rarely exceed fifteen amps. More often five to ten
Okay, you need to build up a "shop power
cart" consisting of two 12v batteries + the
HP power supply. I had just such a critter
for 1K1 while we owned it.
I got a metal "projector cart" on wheels at
Sam's Club. Office supply stores have them
too. Or you can built it out of wood. I'll
suggest that the 18 a.h. RG batteries that
you mentioned would be MINIMUM. These will have
tabs you can bolt up to. See:
http://www.aeroelectric.com/Mfgr_Data/Batteries/Panasonic/17AH.gif
You'll also want to put some form of ON/OFF
control on the cart. If you know someone that
runs a TC aircraft bone yard, you can probably
get your hands on a 6041 series contactor out
of one of larger singles. See:
http://www.aeroelectric.com/Mfgr_Data/Contactors/Eaton_CH/6041SeriesPowerRelays.pdf
Needs to be a 28v, 200A or larger device. Alternatively,
you can use an el-cheeso White-Rogers device. See:
http://www.aeroelectric.com/Mfgr_Data/Contactors/Stancor-WhiteRogers/Stancor_70-Series.pdf
You'll need a 70-903 or 70-907. You can get
these from Allied Electronics at:
http://tinyurl.com/2rnz43
also a fat diode on a heatsink to isolate the
power supply from the battery to avoid the
"crowbar" nuisance trip I cited earlier. See:
http://www.vishay.com/docs/93162/93162ird.pdf
Digikey has the IRD3911 in stock for about $9
at:
http://tinyurl.com/yoqsn7
Nice fat heatsinks for these diodes are getting
hard to find. Drop me your address and I'll
mail you one.
You'll also need a hardware store toggle switch,
an ANL200 current limiter (don't leave this out!)
and a nice, bright red PWR ON light for the cart
to show when the output leads are hot. It would
also be nice to have a voltmeter. I can fix you
up with one.
In operation, the battery cannot be connected
to the airplane unless the HP supply is plugged
in and turned on. The diode prevents backfeed that
WILL damage your power supply. By the way, if you
want to use the full output capability of HP supply,
you'll need to wire it for 240 volts and run a 240
line cord to it. I have one of these on my bench
and it will pop a 20A breaker when operating from
120 VAC and I try to load it to full output.
You'll find this cart quite handy. In fact, with
some minor additions, you could make it a 14/28
volt cart by connecting the batteries in parallel,
changing the contactor to a 14v device and use
a resistor in series for 28v operation. The indicator
light is a little dim on 14v but if you've got
a really obnoxious light for 28v service, it will
be adequate at 14v.
I had just such a cart and used it a lot. I
had 12v car batteries instead of RG but otherwise
it was the same setup. Of course it would crank
an engine very smartly. My cart had "piper"
style ground power plug on the end of the service
output cord. I then fabricated some adapters
to let me plug into a mil-std jack or attach
directly to the b-lead of an alternator to emulate
a running engine/alternator.
This may seem like a lot of fuss . . . but you'll
be glad you did it.
Bob . . .
Message 21
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| Subject: | Re: Battery Question? |
ignore this and see earlier post . . .
At 11:38 PM 12/16/2007 -0500, you wrote:
>Good Evening Bob,
>
>When using that address, I seem to be getting a 24 to 12 converter!
>
>Happy Skies,
>
>Old Bob
>AKA
>Bob Siegfried
>Ancient Aviator
>Stearman N3977A
>Brookeridge Air Park LL22
>Downers Grove, IL 60516
>630 985-8503
>
>In a message dated 12/16/2007 10:12:03 P.M. Central Standard Time,
>nuckolls.bob@cox.net writes:
>Toss this idea in the hat. Theres a power supply on
> ebay right now at:
>
>http://tinyurl.com/2mzrkk
>
>
>----------
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Bob . . .
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