Today's Message Index:
----------------------
1. 05:55 AM - Re: Re: Converting to externally reg alternator (Robert L. Nuckolls, III)
2. 08:31 AM - Re: OT: low voltage bulb base *NOT LAMP HOLDER* (Bob McCallum)
3. 09:12 AM - Re: OT: low voltage bulb base *NOT LAMP HOLDER* (Robert L. Nuckolls, III)
4. 08:35 PM - Re: Re: Converting to externally reg alternator (Richard Girard)
Message 1
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| Subject: | Re: Converting to externally reg alternator |
At 08:43 PM 4/4/2012, you wrote:
>
>Ah! Since anecdotal evidence is apparently compelling, my Ford had
>a runaway alternator, which resulted in a battery explosion, which
>peppered the underside of the hood with acid burns. Bummer.
>
>Paul
Good morning Paul, long time no hear!
As I was talking to the chief engineer at
MPA about this experiences with alternators,
it would have been interesting to know how
what percentage of alternators coming in
the door had failed regulators . . . and what
the failure modes were.
The only alternators that they routinely examined
for fault analysis were those returned on
warranty. As I stated in the narrative of my visit
the rate of returns had mostly to do with the
skills of the installer. An exceedingly small
number of warranty returns had any failures at
all.
Of course, ALL alternators coming through the
rebuild stream had been replaced for reasons
some mechanic thought were good. At the same
time, I've encountered few mechanics that
REALLY understand how the alternator works and
how to accurately troubleshoot systems that
exhibit less than gross failure.
Virtually none of the normal work stream was
evaluated for failure modes. It would have
been VERY interesting to see how many had
failed regulators in a runaway mode. But alas,
22,000 items passed through that facility
every day. Any effort to glean such information
from those carcasses would have been very
difficult/expensive.
The bottom line is that the best source of
data we have comes from the aviation community
. . . and that data will be anecdotal at best.
The bright side is that the astute system
designer needs only to know that risk for
regulator failure in any system is not zero
and happily, insurance against such failures
is inexpensive.
As the personable spokesperson for Allstate
might suggest, "You're in good hands with
OV protection."
Bob . . .
Message 2
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| Subject: | OT: low voltage bulb base *NOT LAMP HOLDER* |
Raymond;
Here's a link to a fairly extensive selection of both empty bases and also
bases with wire leads in place of the lamp element. Scroll waaaay down for
some of them.
http://tinyurl.com/7mmne4u
Bob McC
> -----Original Message-----
> From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-
> server@matronics.com] On Behalf Of rayj
> Sent: Thursday, April 05, 2012 11:55 PM
> To: aeroelectric-list@matronics.com
> Subject: Re: AeroElectric-List: OT: low voltage bulb base *NOT LAMP
HOLDER*
>
>
> Greetings,
>
> I finally got around to further attempts to salvage lamp bases. I tried
> every solvent I had on the shelf. From water to acetone to MEK. The
> bulbs were soaked for about a week in each. No luck with any of them.
<Big Snip>
Message 3
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| Subject: | OT: low voltage bulb base *NOT LAMP HOLDER* |
At 10:29 AM 4/6/2012, you wrote:
><robert.mccallum2@sympatico.ca>
>
>http://tinyurl.com/7mmne4u
Interesting array of products! Thanks for the
heads-up.
Bob . . .
Message 4
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| Subject: | Re: Converting to externally reg alternator |
Bob, all, Forgive my lack of knowledge here, but I don't understand the
problem here. I use the Z-17 architecture that has the Rotax dynamo output
connected to the battery via relay. If the relay is powered down the
dynamos output goes to ground through a capacitor. At least that's my
understanding. If that is correct, why can't a single wire alternator be
controlled in the same way. In the event of a voltage regulator failure and
a runaway alternator ensues would not the overvoltage module do the same to
a relay connecting the single wire to the battery? Obviously this sounds
simple for an electronic illiterate like me. What am I missing that makes
such a scenario unworkable.
Rick Girard
On Fri, Apr 6, 2012 at 7:53 AM, Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> nuckolls.bob@aeroelectric.com**>
>
>
> At 08:43 PM 4/4/2012, you wrote:
>
>>
>> Ah! Since anecdotal evidence is apparently compelling, my Ford had a
>> runaway alternator, which resulted in a battery explosion, which peppered
>> the underside of the hood with acid burns. Bummer.
>>
>> Paul
>>
>
> Good morning Paul, long time no hear!
>
> As I was talking to the chief engineer at
> MPA about this experiences with alternators,
> it would have been interesting to know how
> what percentage of alternators coming in
> the door had failed regulators . . . and what
> the failure modes were.
>
> The only alternators that they routinely examined
> for fault analysis were those returned on
> warranty. As I stated in the narrative of my visit
> the rate of returns had mostly to do with the
> skills of the installer. An exceedingly small
> number of warranty returns had any failures at
> all.
>
> Of course, ALL alternators coming through the
> rebuild stream had been replaced for reasons
> some mechanic thought were good. At the same
> time, I've encountered few mechanics that
> REALLY understand how the alternator works and
> how to accurately troubleshoot systems that
> exhibit less than gross failure.
>
> Virtually none of the normal work stream was
> evaluated for failure modes. It would have
> been VERY interesting to see how many had
> failed regulators in a runaway mode. But alas,
> 22,000 items passed through that facility
> every day. Any effort to glean such information
> from those carcasses would have been very
> difficult/expensive.
>
> The bottom line is that the best source of
> data we have comes from the aviation community
> . . . and that data will be anecdotal at best.
> The bright side is that the astute system
> designer needs only to know that risk for
> regulator failure in any system is not zero
> and happily, insurance against such failures
> is inexpensive.
>
> As the personable spokesperson for Allstate
> might suggest, "You're in good hands with
> OV protection."
>
>
> Bob . . .
>
>
--
Zulu Delta
Mk IIIC
Thanks, Homer GBYM
It isn't necessary to have relatives in Kansas City in order to be unhappy.
- Groucho Marx
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