N6030X(at)DaveMorris.com
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 Posted: Sat Jan 27, 2007 8:08 pm Post subject: AeroElectric-List Digest: 21 Msgs - 01/26/07 |
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I'll take a crack at it. At several points in the past, Bob has
referred to "dark and stormy night stories" that happened to spam
cans and discussed how these could have been easily avoided with
active notification of overvoltage and undervoltage and the ability
to take alternators offline in the former case and shed loads in the latter.
My 1960 Mooney does not come with any overvoltage or undervoltage
notification. The plane has flown for 46 years and as far as I know,
nobody has ever fallen out of the sky. But the first thing I did
when I bought it was to install an overvoltage / undervoltage
notification system so that I have options and do not appear in the
next "dark and stormy night" story in Plane and Pilot or Flying
magazine. I want to eventually install some nice expensive avionics,
and I don't want it ruined by a runaway electrical system that I
could have prevented. You guys can do what you want, nobody is
twisting your arm.
Dave Morris
At 08:18 PM 1/27/2007, you wrote:
| Quote: | Bob: You said, "I'm not going to respond to the lack of
understanding and substance in your last postings" in your response
to George's comments on internally regulated alternators. But isn't
he just saying pretty much what the Plane Power people, brochures,
and product specs say? Tough for us "pilots" out here to know the
"electrical truth" when the experts are this far apart on the "facts".
Allow me to summarize what I believe I have heard over the last
several months on this forum and where I think this leaves those of
us who just want to build a safe, operationally flexible airplane
and FLY it: One side says that modern internally regulated
alternators are reliable and fundamentally sound, and indeed,
cutting edge designs. They are said to rarely fail and when they
do to do so generally in an orderly fashion. The Plane Power design
for one, is said even to eliminate the last vestiges of the concerns
in the anti-internally regulated argument.
The "other side" says this is not true and that internally regulated
alternators are fundamentally and fatally flawed with respect to
their penchant for a potentially damaging and dangerous runaway
voltage/amperage excursion. They are not foolproof by any means and
in fact, fail often enough to give legitimate pause to anyone
considering their use. A potential "fix" is said to be in the works
for some as yet, unannounced future date, however.
These two positions are about as far apart as it is possible to be,
it seems to me and has left me and perhaps others wondering which
system to "bet" on in our own aircraft. I for one, have listened to
the debate in this forum for months and am no better informed at
this point than I was when I started. Technically, I suppose, that
is not accurate. I know a GREAT deal more than I did before (thanks
very much to all who have contributed), but with respect to the
fundamental issue of which systems works best or is most suitable
for a high end OBAM all electric aircraft, I STILL don't know which
has been better justified through this debate. And, like many
others I suspect, I don't really have a horse in this race---I just
want to make the right choice for my aircraft.
If it is true that there is neither "understanding" nor "substance"
to the arguments made in favor of the internally regulated Plane
Power alternator (and perhaps others like them which claim orderly
and infrequent failure modes), then it seems to me they should be
taken off the market and prevented from endangering the aircraft
they might be installed in. I'm having trouble believeing that is
the case with these modern and apparently cutting edge designs, but
I'm also having trouble reading your most recent comments any other
way. I have no connection to any entity in this debate and none
with Plane Power or any other manufacturer. I'm just trying to
figure out which alternator to put on my airplane. Are internally
regulated alternators now considered by forum experts to be so
fundamentally flawed and inapproprite in OBAM aircraft as to be
beyond discussion?
Scratching my head in South Carolina,
Lee...
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