Today's Message Index:
----------------------
1. 07:42 AM - The book (Carlos W Jazun)
2. 08:22 AM - Re: Good news . . . and bad news (Lynn Cole)
3. 09:28 AM - Re: Good news . . . and bad news (Roger & Jean Curtis)
4. 09:51 AM - Re: Resurrecting a battery (Robert L. Nuckolls, III)
5. 10:10 AM - Re: The book (Robert L. Nuckolls, III)
6. 12:21 PM - Re: Good news . . . and bad news (Robert L. Nuckolls, III)
7. 12:49 PM - Crowbar OVM adjustment/test fixture (Robert L. Nuckolls, III)
8. 12:58 PM - Re: The book (Robert L. Nuckolls, III)
9. 01:32 PM - Re: The book (Carlos W Jazun)
10. 05:12 PM - Re: AIRCAM Schematic or ideas (Chris)
11. 05:21 PM - Re: Crowbar OVM adjustment/test fixture (Ken)
12. 08:03 PM - Re: Crowbar OVM adjustment/test fixture (nuckollsr)
13. 08:04 PM - Re: AIRCAM Schematic or ideas (nuckollsr)
Message 1
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Hello Bob,
As of today I have not received my book.
Do you have an estimate as to when I would be getting it?
Please let me know.
Regards
Walter Jazun
Parker, Colorado
ps, paypal shows already collected.
-----Original Message-----
From: Robert L. Nuckolls, III <nuckolls.bob@aeroelectric.com>
Sent: Fri, Sep 28, 2012 8:37 pm
Subject: Re: AeroElectric-List: Resurrecting a battery
Here's where my ignorance startsshowing. Is this setup using mains voltage?
Rectified and currentlimited? 120+ volts DC, current limited to 1-2 amps?
Yes. Suppose the power coming into the back of your
house was being supplied by one of the honorable
T.A. Edison power stations . . . 120 volts DC.
Okay, 150 watt bulb will draw about 1.30 amps.
Now hook a 12v battery in series with this setup
such that current flowing through the lamp tends
to CHARGE the battery. Voltage across the
lamp drops by 12v or so the current drops a bit.
But the lamp still burns brightly and current
through the lamp is charging the battery . . . the
lamp becomes a 100W resistor.
Horribly inefficient?
Yes . . . unless you want to sit down and read a book
while the battery is charging and can make use of
the light output.
Now, consider a similar design goal but the power
delivered to the back of the house is AC. We can
add the rectifier such that reversal in the applied
voltage is rectified so that it always charges the
battery irrespective of line polarity . . . the lamp(s)
still limits the current . . . want a stronger charge
rate? More or bigger lamps.
Again, only 10% of total energy consumed goes into
the battery . . . but it IS current limited. Probably
not a charger you want to build for routine battery
maintenance but it is an option for generating a
current limited VOLTAGE source that will RISE to what ever
level the injured battery will accept. If it goes to more
than 2X battery rating and/or if it doesn't begin to
fall in a few minutes, then this resuscitation gambit
is futile and should be discontinued.
Bob . . .
Message 2
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| Subject: | Re: Good news . . . and bad news |
Hi Bob,
> Price is hard to beat! One would need an instrumentation
> amplifier to read current shunts . . . but the AD628 makes
> that really simple. Just need a 36-hour day . . .
I have two partial solutions to your dilemma of a 36-hour day. ;-)
Unfortunately nobody I have talked to likes my ideas:
(1) This idea is made obsolete by modern electronic clocks and watches.
Design a pair of elliptical gears into your clock so that the hour hand
goes zipping around during the night-time hours of 10 pm until 6 am, but
it moves slooowly during the day-time hours of 6 am until 10 pm.
(2) Noting that there are 168 hours in a week (7 days times 24 hours
per day), rearrange the week to have 6 days of 28 hours, each. The week
would still be 168 hours long, but each day would have an extra block of
4 hours that you could use however you wish.
Just a thought...
-----
Lynn Cole
LynnCole@foxvalley.net
Message 3
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| Subject: | Good news . . . and bad news |
Hi Bob,
Price is hard to beat! One would need an instrumentation
amplifier to read current shunts . . . but the AD628 makes
that really simple. Just need a 36-hour day . . .
I have two partial solutions to your dilemma of a 36-hour day. ;-)
Unfortunately nobody I have talked to likes my ideas:
(1) This idea is made obsolete by modern electronic clocks and watches.
Design a pair of elliptical gears into your clock so that the hour hand
goes zipping around during the night-time hours of 10 pm until 6 am, but
it moves slooowly during the day-time hours of 6 am until 10 pm.
(2) Noting that there are 168 hours in a week (7 days times 24 hours
per day), rearrange the week to have 6 days of 28 hours, each. The week
would still be 168 hours long, but each day would have an extra block of
4 hours that you could use however you wish.
Just a thought...
-----
Lynn Cole
LynnCole@foxvalley.net
Lynn,
Please don=99t let this get out!!! Especially to =9CHighly
intelligent politicians=9D, at least in their own mind. These
overpaid representatives of the people will try to find a way to
implement it. =98=BA
Roger
Do not archive
Message 4
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| Subject: | Re: Resurrecting a battery |
At 12:34 AM 9/29/2012, you wrote:
>Very clear now. 1 picture=1k words. I had the lamp on the DC side
>in my mind. I'll report back when I have something to report.
>
>I assume there is no reason to put in a cap to try to limit ripple.
Naw . . . those molecules of lead and acid aren't picky.
There's some school of thought that impressing clumped
up molecules with bursts of high frequency energy tends
to break them up and increase surface area . . . i.e.
restore active chemistry. This prompted a constellation of
product development in 'battery de-sulfators'.
http://tinyurl.com/9c4gwk8
I've yet to see a well crafted laboratory study that confirms
any claimed efficacy for such devices.
Actually, about 1965 there was a rash of articles in
popular 'technical' publications suggesting that one
could recharge the carbon-zinc cell if the energy replacement
profile was half-wave rectified DC (Figure 2 with only
one diode). This 'rattling' of the chemistry was suppose
to make things happen that the original designers of
the carbon-zinc cell never imagined.
I'll forward a copy of the previous post to Skip Koss along
with this one . . . he may have additional insights to
contribute.
Bob . . .
Message 5
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At 09:41 AM 9/29/2012, you wrote:
>Hello Bob,
>
>As of today I have not received my book.
>
>Do you have an estimate as to when I would be getting it?
I show a mailing label printed on the 22nd.
You should have received it by now. Another
copy will go out today.
Bob . . .
Message 6
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| Subject: | Re: Good news . . . and bad news |
At 10:21 AM 9/29/2012, you wrote:
>Hi Bob,
>>Price is hard to beat! One would need an instrumentation
>>amplifier to read current shunts . . . but the AD628 makes
>>that really simple. Just need a 36-hour day . . .
>I have two partial solutions to your dilemma of a 36-hour day.
>;-) Unfortunately nobody I have talked to likes my ideas:
I'll bet you could get a patent on it . . . the
patent office is exceedingly accepting of ideas
irrespective of efficacy or merchantability.
But having a patent preserves the idea
in perpetuity!
Bob . . .
Message 7
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| Subject: | Crowbar OVM adjustment/test fixture |
The crowbar ovm has been in production for OBAM
aircraft since 1985 and has been incorporated in to
light airplanes in about a dozen configurations.
I'm getting an increasing number of queries for a
means by which they can be tested either on an airplane
or on the bench. Here's the fixture I have used here
for some years.
http://tinyurl.com/8e552q9
A 6v relay is wired to work like a buzzer (coil
in series with N.C. contacts). A 10 ohm resistor
tied across the coil to increase it's apparent
'draw' to make sure the crowbar scr latches
well.
In the airplane, you open the field supply breaker
and switch and clip the fixture across the ovm
to be tested. Increase applied voltage until the
relay begins to 'buzz' and then back the voltage
off until it clicks at about one per second rate.
THAT voltage is the current calibration point for
the OVM. On the bench, I set the power supply for
16.3 volts and adjust the calibration pot for
1 click per second. This is MUCH more precise
and convenient than the technique described in
the DIY crowbar literature.
Bob . . .
Message 8
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At 09:41 AM 9/29/2012, you wrote:
>Hello Bob,
>
>As of today I have not received my book.
>
>Do you have an estimate as to when I would be getting it?
I show a mailing label printed on the 22nd.
You should have received it by now. Another
copy will go out today.
P.S. The PostOffice reports delivery as of today.
It's media mail so it doesn't get the same attention
as more expensive services.
9449009699939129201366
Package Services
Sorting Complete
September 29, 2012, 11:07 am
PARKER, CO 80134
Delivery Confirmation=99
Bob . . .
<http://www.matronics.com/Navigator?AeroElectric-List>http://www.matronics.c
om/Navigator?AeroElectric-List
<http://www.matronics.com/contribution>http://www.matronics.com/contribution
No virus found in this message.
Checked by AVG - <http://www.avg.com>www.avg.com
Bob . . .
Message 9
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Thank you, looking forward to it
Walt
-----Original Message-----
From: Robert L. Nuckolls, III <nuckolls.bob@aeroelectric.com>
Sent: Sat, Sep 29, 2012 1:58 pm
Subject: Re: AeroElectric-List: The book
At 09:41 AM 9/29/2012, you wrote:
HelloBob,
As of today I have not received my book.
Do you have an estimate as to when I would be getting it?
I show a mailing label printed on the 22nd.
You should have received it by now. Another
copy will go out today.
P.S. The PostOffice reports delivery as of today.
It's media mail so it doesn't get the same attention
as more expensive services.
9449009699939129201366
Package Services
Sorting Complete
September 29, 2012, 11:07 am
PARKER, CO 80134
Delivery Confirmation=C2=99
Bob . . .
AeroElectric-List Email Forum -
http://www.matronics.com/Navigator?AeroElectric-List
;
- MATRONICS WEB FORUMS -
http://forums.matronics.com
;
- List Contribution Web Site -
;
-Matt Dralle, List Admin.
http://www.matronics.com/contribution
No virus found in this message.
Checked by AVG - www.avg.com
09/29/12
Bob . . .
Message 10
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| Subject: | AIRCAM Schematic or ideas |
Thank you Bob, that is very helpful. Can you explain what happens if the
"standby" alternator is activated while the "main" is active?
Thanks
Chris
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L.
Nuckolls, III
Sent: Friday, September 28, 2012 11:52 AM
Subject: RE: AeroElectric-List: AIRCAM Schematic or ideas
--> <nuckolls.bob@aeroelectric.com>
At 08:51 PM 9/27/2012, you wrote:
>--> <toaster73@embarqmail.com>
>
>Correction noted.
>thanks
>Chris
If it were my airplane . . .
http://tinyurl.com/cf2ppmx
http://tinyurl.com/cg8falj
Bob . . .
Message 11
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| Subject: | Re: Crowbar OVM adjustment/test fixture |
This might work with just a heavy automotive light bulb instead of the
relay and resistor. Perhaps a brake light or maybe a headlight. The bulb
might well drop insignificant voltage prior to tripping. It would have
to be heavy enough to keep the scr conducting so that it stayed lighted
when the ovm activates.
Ken
On 29/09/2012 3:48 PM, Robert L. Nuckolls, III wrote:
> <nuckolls.bob@aeroelectric.com>
>
> The crowbar ovm has been in production for OBAM
> aircraft since 1985 and has been incorporated in to
> light airplanes in about a dozen configurations.
>
> I'm getting an increasing number of queries for a
> means by which they can be tested either on an airplane
> or on the bench. Here's the fixture I have used here
> for some years.
>
> http://tinyurl.com/8e552q9
>
> A 6v relay is wired to work like a buzzer (coil
> in series with N.C. contacts). A 10 ohm resistor
> tied across the coil to increase it's apparent
> 'draw' to make sure the crowbar scr latches
> well.
>
> In the airplane, you open the field supply breaker
> and switch and clip the fixture across the ovm
> to be tested. Increase applied voltage until the
> relay begins to 'buzz' and then back the voltage
> off until it clicks at about one per second rate.
>
> THAT voltage is the current calibration point for
> the OVM. On the bench, I set the power supply for
> 16.3 volts and adjust the calibration pot for
> 1 click per second. This is MUCH more precise
> and convenient than the technique described in
> the DIY crowbar literature.
>
>
> Bob . . .
>
Message 12
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| Subject: | Re: Crowbar OVM adjustment/test fixture |
Sure. This is what I've shown in the DIY crowbar instructions . . . but the supply
needs to be manually reset after each trip. An adjustment procedure or QA
check on the bench is tedious. This fixture resets the ovm each time the contacts
open. By seeking that once-per-second sweet spot, the test establishes the
near infinite trip time setpoint by simply listening.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=384289#384289
Message 13
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| Subject: | Re: AIRCAM Schematic or ideas |
Probably nothing serious. But it might mask failure of one alternator when the
second one shoulders the loads. A failure that become latent and unnoticed until
next preflight. Better that you know it before you land as opposed to just
before you wanted to take off.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=384290#384290
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