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egilroy(at)gmail.com
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 Posted: Mon Oct 25, 2010 8:44 am Post subject: Ground Power / Tiedown Power Cart |
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That was exactly the kind of device I had mused about in my original request to this group. It doesn't quite qualify as "idiot-proof", but comes pretty close.
Ed
On Mon, Oct 25, 2010 at 11:22 AM, Mike Welch <mdnanwelch7(at)hotmail.com (mdnanwelch7(at)hotmail.com)> wrote:
[quote]
| Quote: | You know, the thing that would make the 12 - 24v battery cart zippy would be a DPDT knife switch
>I wonder if such a thing is still available, especially in some sort of surpluss house...
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Glen,
You mean like this;
http://www.wirthco.com/12/24-volt-heavy-equipment-switch-p-66-l-en.html
Although it isn't configured exactly yet, it wouldn't be but a very minor mod to make it so.
I think you are right. This would be a very simple solution!!
Mike Welch
| Quote: |
ist" target="_blank">http://www.matronics.com/Navigator?AeroElectric-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution
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mdnanwelch7(at)hotmail.co
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| Posted: Mon Oct 25, 2010 9:10 am Post subject: Ground Power / Tiedown Power Cart |
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Ed,
I'd think that someone who can't get the battery boost-start correct, or otherwise screws
up this DPDT blade set-up might not have any business working near a plane. Just a thought....
Mike
Date: Mon, 25 Oct 2010 12:37:38 -0400
Subject: Re: Re: Ground Power / Tiedown Power Cart
From: egilroy(at)gmail.com
To: aeroelectric-list(at)matronics.com
That was exactly the kind of device I had mused about in my original request to this group. It doesn't quite qualify as "idiot-proof", but comes pretty close.
Ed
On Mon, Oct 25, 2010 at 11:22 AM, Mike Welch <mdnanwelch7(at)hotmail.com (mdnanwelch7(at)hotmail.com)> wrote:
[quote]
| Quote: | You know, the thing that would make the 12 - 24v battery cart zippy would be a DPDT knife switch
I wonder if such a thing is still available, especially in some sort of surpluss house...
Glen Matejcek
|
Glen,
You mean like this;
http://www.wirthco.com/12/24-volt-heavy-equipment-switch-p-66-l-en.html
Although it isn't configured exactly yet, it wouldn't be but a very minor mod to make it so.
I think you are right. This would be a very simple solution!!
Mike Welch
| Quote: |
ist" target="_blank">http://www.matronics.com/Navigator?AeroElectric-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution
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-List" target=_blank>http://www.matronics.com/Navigator?AeroElectric-List
ttp://forums.matronics.com
=_blank>http://www.matronics.com/contribution
[b]
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BobsV35B(at)aol.com
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| Posted: Mon Oct 25, 2010 12:28 pm Post subject: Ground Power / Tiedown Power Cart |
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Good Afternoon Mike,
You may well be correct, but there are many of us who have been working on airplanes for sixty years or more who do still make mistakes. Last I heard, to err is human<G>
I'll take all the help I can get.
Happy Skies,
Old Bob
In a message dated 10/25/2010 12:11:49 P.M. Central Daylight Time, mdnanwelch7(at)hotmail.com writes:
| Quote: | Ed,
I'd think that someone who can't get the battery boost-start correct, or otherwise screws
up this DPDT blade set-up might not have any business working near a plane. Just a thought....
Mike
Date: Mon, 25 Oct 2010 12:37:38 -0400
Subject: Re: AeroElectric-List: Re: Ground Power / Tiedown Power Cart
From: egilroy(at)gmail.com
To: aeroelectric-list(at)matronics.com
That was exactly the kind of device I had mused about in my original request to this group. It doesn't quite qualify as "idiot-proof", but comes pretty close.
Ed
On Mon, Oct 25, 2010 at 11:22 AM, Mike Welch <mdnanwelch7(at)hotmail.com (mdnanwelch7(at)hotmail.com)> wrote:
| Quote: |
| Quote: | You know, the thing that would make the 12 - 24v battery cart zippy would be a DPDT knife switch
I wonder if such a thing is still available, especially in some sort of surpluss house...
Glen Matejcek
|
Glen,
You mean like this;
http://www.wirthco.com/12/24-volt-heavy-equipment-switch-p-66-l-en.html
Although it isn't configured exactly yet, it wouldn't be but a very minor mod to make it so.
I think you are right. This would be a very simple solution!!
Mike Welch
| Quote: |
ist" target="_blank">http://www.matronics.com/Navigator?AeroElectric-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution
|
-List" target=_blank>http://www.matronics.com/Navigator?AeroElectric-List
ttp://forums.matronics.com
=_blank>http://www.matronics.com/contribution
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List href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.matronics.com/Navigator?AeroElectric-List
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ms.matronics.com/">http://forums.matronics.com
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tp://www.matronics.com/contribution">http://www.matronics.com/contribution
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nuckolls.bob(at)aeroelect
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| Posted: Wed Oct 27, 2010 1:11 pm Post subject: Ground Power / Tiedown Power Cart |
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At 10:08 PM 10/24/2010, you wrote:
| Quote: | Bob,
For your consideration.
|
Sorry . . . been out of town for a couple days. Dr. Dee
had to move her offices at the college. I've been helping
with cleaning, painting and repairing. Yeah, they do
have folks that take care of those things, when it works
into their schedule. We got it move-in-ready in two days.
The scheme you show would work too.
Bob . . .
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aerobubba(at)earthlink.ne
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| Posted: Wed Oct 27, 2010 6:03 pm Post subject: Ground Power / Tiedown Power Cart |
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Whupps- looks like I hit send a smidge too soon... the size is listed on
another tab and would be entirely fine at 4-3/4"W x 6-3/8" L x 2"H. Were
it mounted in a recess behind a hinged piece of plex such that the plex
naturally fell over the switch to cover it, it would be protected from
accidental tool-induced shorts while it's position would still be visible.
Then about the only pilot-proofing issue would be avoiding plugging the
unit into a 12v system while configured for 24v.
Glen Matejcek
aerobubba(at)earthlink.ne
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raymondj(at)frontiernet.n
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| Posted: Wed Oct 27, 2010 8:25 pm Post subject: Ground Power / Tiedown Power Cart |
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Bob,thanks for looking at it.
I, Raymond Julian, do hereby formally release the design into the wild.
If anyone builds one I would be interested in hearing about it or seeing
pictures.
Raymond Julian
Kettle River, MN
On 10/27/2010 04:10 PM, Robert L. Nuckolls, III wrote:
| Quote: |
<nuckolls.bob(at)aeroelectric.com>
At 10:08 PM 10/24/2010, you wrote:
> Bob,
>
> For your consideration.
Sorry . . . been out of town for a couple days. Dr. Dee
had to move her offices at the college. I've been helping
with cleaning, painting and repairing. Yeah, they do
have folks that take care of those things, when it works
into their schedule. We got it move-in-ready in two days.
The scheme you show would work too.
Bob . . .
|
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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nuckolls.bob(at)aeroelect
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| Posted: Sat Oct 30, 2010 5:29 am Post subject: Ground Power / Tiedown Power Cart |
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At 10:28 AM 10/29/2010, you wrote:
| Quote: |
I was thinking also that using power solenoid relays, the type used on RVs
it would be possible to install two power cables with differing physical
characteristics that would automatically fire the solenoids to give the
correct voltage... That way you couldn't ever hit your 14V system with a
28V boost. You could also just use the 12V connector for charging. It may
require that your connectors have switches close to them.
|
The 'professional' carts are virtually all
configured for 12/24 with high current contactors.
I started to publish a drawing suggesting that
approach.
Then I began to consider how often the OBAM
aircraft owner/operator would make use of the
device and did some trade-offs for cost of
acquisition/ownership versus frequency of
need.
As a spam can jocky, I think I needed the
support of a ground power cart perhaps three
or four times in 1000+ hours and 30 years.
For the half year we owned the airport at
Benton, we never pulled out the battery
cart even once.
So how much $time$ is appropriate for the
acquisition of a battery cart for personal
use? This is a question that each builder
has to consider for themselves. The answers
may range from two batteries in a Radio Flyer
wagon and an array of jumper cables . . . up
to an including a killobuck Hobart gound-power
cart.
The approach I suggested was my assessment of
a low $time$ approach that offered all the
necessary capabilities for getting an engine
started on either 14 or 28v aircraft which
exploited the hands-on approach to fabrication
that is deeply rooted in OBAM aviation.
It takes about $100 worth of contactors to
do the 12/24 switching. The bill of materials
for a manual 'patch panel' is much less
expensive and can be acquired at any well
stocked hardware store. The choices are
many. The basic schematic for the contactor
based battery cart was published by another
reader last week I believe.
Bob . . .
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