Today's Message Index:
----------------------
1. 04:43 AM - Re: Coolie Hat Switch (Etienne Phillips)
2. 06:00 AM - Re: Coolie Hat Switch (Robert L. Nuckolls, III)
3. 09:43 AM - Re: Coolie Hat Switch (Peter Mather)
4. 01:44 PM - Fw: Coolie Hat Switch (Buckley William)
5. 05:02 PM - Re: battery chargers (Robert L. Nuckolls, III)
6. 05:07 PM - Re: Fw: Coolie Hat Switch (Robert L. Nuckolls, III)
7. 05:30 PM - Re: battery chargers (Robert L. Nuckolls, III)
8. 06:46 PM - HID EMC update (Robert L. Nuckolls, III)
9. 07:29 PM - OT: Old electronics info. (rayj)
Message 1
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| Subject: | Re: Coolie Hat Switch |
**On 5 March 2012 06:50, <sam.marlow@roadrunner.com> wrote:
>
> Does anyone have a source for a roll your own coolie hat switch?
>
Hi Sam
Not cheap, but available from RS Components...
*http://tinyurl.com/6u8ephu
*
Hope that helps!
Etienne*
*
Message 2
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| Subject: | Re: Coolie Hat Switch |
At 10:50 PM 3/4/2012, you wrote:
>
>Does anyone have a source for a roll your own coolie hat switch?
I would think you'd need access to some
pretty good machine tools and a good bit
of patience. Not sure DIY is very cost
effetive.
Ray-Allen has one
http://www.rayallencompany.com/products/switches.html
Bob . . .
////
(o o)
===========o00o=(_)=o00o========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
================================
Message 3
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| Subject: | Coolie Hat Switch |
Cheapest way of getting one is using an electric wing mirror switch from a car
breakers or ebay
Message 4
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| Subject: | Coolie Hat Switch |
Take a look at these from Digikey ($22.50 each)
http://search.digikey.com/us/en/products/500-526/679-2289-ND/2063280
William B.
--- On Sun, 3/4/12, sam.marlow@roadrunner.com <sam.marlow@roadrunner.com> wrote:
> From: sam.marlow@roadrunner.com <sam.marlow@roadrunner.com>
> Subject: AeroElectric-List: Coolie Hat Switch
> To: "aeroelectric-list@matronics.com" <aeroelectric-list@matronics.com>
> Date: Sunday, March 4, 2012, 11:50 PM
> --> AeroElectric-List message
> posted by: <sam.marlow@roadrunner.com>
>
> Does anyone have a source for a roll your own coolie hat
> switch?
>
> AeroElectric-List Email Forum -
> - MATRONICS WEB FORUMS -
> List Contribution Web Site -
> -Matt
> Dralle, List Admin.
>
>
>
>
Message 5
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| Subject: | Re: battery chargers |
At 07:41 AM 3/4/2012, you wrote:
>
>Hi Bob,
>
>The explosion I mentioned was in reference to a flooded battery, not
>an Odyssey. I once put a charger on my tractor and forgot about
>it. A few weeks later I found part of the battery case about 10
>feet from the tractor. The rest of the battery was still in the
>tractor battery box with the innards showing! I assume that when
>the electrolyte got below the top of the plates that some conductive
>debris shorted between them and set off the oxygen/hydrogen
>explosion. This experience has caused me to be leery of battery
>tenders. This could happen with even a 1/2 amp charger because the
>energy that makes the spark comes from the battery, not the charger.
>
>Thanks for the excellent information in your post on battery chargers.
Oh yeah . . . I've seen flooded batteries do a
steam explosion . . . or more like a volcano
eruption too. A good friend of mine worked in
the Naval Battery Labs at Crane, IN. Those
labs are a kind of battery-hell. Many folks
(especially submariners) wont qualify a battery
until Crane sez, "they can't blow it up."
She sent me some videos of some rather spectacular
'batterycides'.
I am aware of only one in-service RG battery explosion.
It was a new model Concorde being qualified onto
a GA jet. This particular battery had been subjected to some
severe conditions of overcharging followed by
a couple of spool-ups (no ignition or fuel) on
the airplane. The evolved gasses combined with
some simulated balked starts fused a cross-over
joint between cells . . .
Emacs!
Concorde's crossovers are soldered on by hand . . .
Emacs!
. . . and set high enough on the cell wall to become immersed in
epoxy encapsulant which is used to fill the inter-cell sealing
channels in the lid . . .
Emacs!
Interestingly enough, this battery design had already been
qualified to the RTCA/TSO requirements . . . which seem not
to stress a battery as hard as in the incident aircraft.
Even though analysis of the event said it was not necessary,
Concorde did beef up the inter-cell connectors in that model
of battery.
We have been apprised of an incidence of a high-energy,
internal event on a Hawker 10 AH 24V battery . . .
Emacs!
Temperatures were so high as to severely char the internals
Emacs!
. . . I think this event stayed inside the battery case except
for one small hole.
I wasn't informed of the history of this even but given the
battery's small size (10 a.h.) and the size of the typical
24v alternator (60A) I'm betting that the short term high
recharge rates for this battery were exceeded causing
a failure of the one cell.
The RG or SVLA battery has amassed a long history of
robust service and few exceptions for more than benign
failures . . . and they get better all the time.
Bob . . .
Message 6
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| Subject: | Re: Coolie Hat Switch |
At 03:42 PM 3/5/2012, you wrote:
><hoverandwire@yahoo.com>
>
>Take a look at these from Digikey ($22.50 each)
>
>http://search.digikey.com/us/en/products/500-526/679-2289-ND/2063280
Cool find Bill . . . these are electrically 'delicate'
switches. Rated 1 to 50 mA. They should be used to control
a solid-state buffered relay deck but they look pretty
slick.
Bob . . .
Message 7
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| Subject: | Re: battery chargers |
At 11:40 AM 3/4/2012, you wrote:
>
>During charging, offgases are produced. If those gasses collect
>somewhere, a spark can indeed set them off. Yes, thay can collect
>inside the battery itself. Several RV batteries have been blown up
>that way so I assume that it happens all over the place. Happened
>to me once and my battery compartment is well ventilated.
>
>David M,
Was there any sort of failure analysis done? Pictures
taken? An RG battery stressed so hard as to produce
gasses not contained in the mats combined with some
spark-producing condition begs for answers as to root
cause. I would be reluctant to assume that it 'happens
all over the place' . . . yours is the first mention
of explosive de-construction of a battery here on
the List in many years.
I was aware of a battery box explosion in a GlasAir
wherein the battery box provided containment and
a battery contactor provided ignition. But even that
event was poorly documented and no mention was made
of what was probably a sustained OV event that cooked
the battery.
Somebody sent me an abused Odyssey some years back,
Dec 2005 I think. I sent it to Concorde and their guys
tore it down for closer examination.
In this case, the battery case was intact. The battery had
be subject to an OV condition which heated the battery up
while building large sulfation crystals on the normally thin
plates. The thing puffed up like a guppy.
Emacs!
Emacs!
RG batteries are not designed to withstand severe over-charging
or extra-ordinary stress such as that which produced the
one real explosion I'm aware of. After running the gauntlets at
TSO or Naval qualification labs, they are shown to offer benign
failure events when used in a system with legacy attention paid to
rapid mitigation of an OV event.
If anyone becomes aware of what appears to have been an explosive
rupture of an RG battery, please let me know about it ASAP. I'll
pay for pictures, a narrative of conditions leading up to the event
and pay the shipping for the carcass. These things need to be
examined by folks who are very good at it so as to broaden our
understanding and improvement on the best we know how to do.
Bob . . .
Message 8
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Had a meeting today that promises to renew a
relationship with folks at National Institute
of Aviation Research (NIAR) on the campus of
Wichita State University.
They are the proud possessors and operators of
an extensive and up-to-date EMC lab. Guys I used
to work with at HBC are now at NIAR. I'll be looking
for an opportunity to get a radio-peek at the two exemplar
HID lamps I've been provided. We'll do conducted emissions
on the power supply wires in addition to a probing
exploration of light's noises on a spectrum analyzer.
Watch this space . . .
Bob . . .
Message 9
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| Subject: | OT: Old electronics info. |
Greetings,
I have an Acme Voltrol type T-2-1404 variable transformer I'm using to
set up a power supply for my bench. Can anyone tell me where I can get
the max Amps or VA rating for it?
I also have a big red rectifier that is about a 6" cube of fins and an
inductor that is the size of a softball and weighs >10lb. Neither have
any identifying marks on them.
Any sources where I can find info on these things would be appreciated.
do not archive
Thanks in advance,
--
Raymond Julian
Kettle River, MN
"And you know that I could have me a million more friends,
and all I'd have to lose is my point of view." - John Prine
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