Today's Message Index:
----------------------
1. 08:01 AM - Re: Deceptive Voltage? (Robert L. Nuckolls, III)
2. 08:33 AM - Engine ground (John Tvedte)
3. 09:34 AM - Re: Another battery maintainer/charger question (David LLoyd)
4. 09:53 AM - OSH '10 Options (John Cox)
5. 06:46 PM - Re: Engine ground (Robert L. Nuckolls, III)
6. 06:51 PM - Microair 760 bench test fixture (Robert L. Nuckolls, III)
Message 1
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Subject: | Re: Deceptive Voltage? |
At 05:36 PM 7/11/2010, you wrote:
7/11/2010
Hello Bob Nuckolls and other Electrical Gurus,
Suppose you ran your battery down by spinning your first time to be
started O-540 Lycoming engine with the starter in order to preoil the
engine in your nearly finished RV-10. And maybe you did some other
things that ran the battery down.
Then you connected your small amperage output battery charger to the
battery and you attempted to start the Shower of Sparks equipped
engine without success. The engine was cranked OK, but the starting
vibrator just was not putting out.
A check of the system voltage in appropriate points with a separate
volt meter while cranking the engine showed 13 plus volts.
This number appears bogus. A battery is incapable
of delivering energy at more than about 12.5 volts
lightly loaded . . . a few amps. Given that most
batteries offer an internal resistance on the order
of .007 to .010 ohms, a 200A starter draw would be
expected to drop the battery terminal voltage by
perhaps 2 volts. So a terminal voltage of 10.5 or
lower is expected.
Is it possible that the voltage being seen was in fact the voltage
being put out by the battery charger as it attempted to recharge the
run down battery, but the amperage being put out by the run down
battery and battery charger together just was not enough current flow
to run the starting vibrator as well as crank the engine?
No, if the engine cranked at some speed you would
EXPECT to start it, then the battery is fine. The
shower-of-sparks system is designed to do two things:
(1) increased intensity of the sparking energy by
offering a repeating train of battery-supported
sparks and (2) DELAYING the delivery of ANY sparks
until just after TDC such that potential for kickback
is eliminated.
If your engine cranks but doesn't start, the battery
is fine and the SOS system is suspect. This article might
be of value in your quest for making all things right
with the world:
http://www.aeroelectric.com/articles/Shower-of-Sparks/ShowerOfSparks.pdf
Bob . . .
////
(o o)
===========o00o=(_)=o00o========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
================================
Message 2
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When connecting a ground to the engine - I am wondering if braided bonding
straps and flexible wire (aka welding wire) are equally applicable?
I am also wondering how much slack is appropriate regards length.
For example if I measure 15" from firewall stud to engine stud - how much e
xtra length should used to allow for engine movement?
John
Message 3
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Subject: | Re: Another battery maintainer/charger question |
Ed,
The little maintainer should be dead silent. I suspect the step down
transformer inside the unit is bad. I would try to return it to the store
for an exchange or send it back to the manuf. They should be good about
replacing it.
The float voltage should be approx. 13.1 to 13.4 volts. There are probably
internal adjustments "if" you can pop the case. However, if the transformer
is faulty/vibrates at 60/120 Hz. then it needs to be swapped with a good
one.
David
_________________________________________________________
----- Original Message -----
From: "Neal George" <n8zg@att.net>
Sent: Sunday, July 11, 2010 5:13 PM
Subject: RE: AeroElectric-List: Another battery maintainer/charger question
>
> Ed -
> My little Schumacher 1562 1.5-amp charger/maintainer is silent - at least,
> if it makes any noise, I've never noticed it, even in the wee hours with
> the
> house & shop quiet.
>
> Neal
> N8ZG
>
> -----Original Message-----
> From: owner-aeroelectric-list-server@matronics.com
> [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of edleg
>
> Everything works fairly well except for two troubling things:
> 1. the maintainer/charger is very loud, even in the maintainer mode --
> actually louder than my other two regular 6/2 amp and 10/2 amp battery
> chargers.
> 2. the "float" voltage that is maintained is at 12.96 vdc as measured by
> two
> different digital (fluke brand) volt meters. Seems a little bit low when
> reading the other posts here.
>
> So... Bob and the other electron experts: is there a relatively
> (physically)
> small maintainer/charger that doesn't always sound like a loud battery
> charger (oxymoron???) when in the maintainer mode, and is the float
> voltage
> high enough?
>
> Thanks,
>
> -Ed-
> NX6ED
>
>
>
Message 4
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I am again offering B&B style beds in the classic brick Oshkosh house
that I rent each year for EAA members. The house comes with central air
for those hot or humid nights, newly remodeled kitchen, big screen HDTV
(with video input for your daily shots), fresh towels, cold beer and
toiletry service. I will transport campers each day To/From Airventure
2010. Available from Saturday, July 24th through Sunday, August for
$250 per occupant = nine nights and days.
Send me an email with your phone number and I will promptly call back to
secure your First class accomodations. It is way beyond camping on the
field in a tent or staying in a Dorm at the UW-OSH.
John Cox
johnwcox at pacificnw.com <mailto:johnwcox@pacificnw.com>
Message 5
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Subject: | Re: Engine ground |
At 10:31 AM 7/12/2010, you wrote:
>When connecting a ground to the engine I am
>wondering if braided bonding straps and flexible
>wire (aka welding wire) are equally applicable?
yes
>
>I am also wondering how much slack is appropriate regards length.
enough slack that there is no tension and/or
sharp bends adjacent to end terminals.
>
>For example if I measure 15 from firewall stud
>to engine stud how much extra length should
>used to allow for engine movement?
It isn't the enginge that moves a lot, it's the
nice floppy wire that moves. Add a couple or
three inches and don't ask wire to change directions
sharply next to the ends.
Bob . . .
Message 6
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Subject: | Microair 760 bench test fixture |
I've placed a Microair 760 bench test fixture
up on Ebay as item number 150466479723
This can be used to operate your radio on the
bench out of the airplane . . . or in the airplane
independently of ship's wiring. Handy diagnostic/
test tool for this radio.
If you have an xcom 760 radio, this test fixture
can be easily adapted to operate that radio by re-arranging
some wires in the connector.
Bob . . .
////
(o o)
===========o00o=(_)=o00o========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
================================
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