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etienne.phillips(at)gmail
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 Posted: Wed Jan 07, 2009 10:37 am Post subject: SD-8 self excitation |
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Sorry, was not on the planet for a month, and missed this!
After my own investigation, it seems as though the recently produced
regulators are still in need of the work around. I started the
engine, and engaged the alternator with the battery offline, and
nothing happened. Engaged the battery momentarily, and the alternator
supplied the whole electrical system with a sweet 14V from that point
on, until the engine was stopped. Again, once the engine was started
again the alternator circuit didn't supply power until the battery
gave it a jolt.
Just to make sure, once the alternator is delivering power, I can
remove the battery from the circuit and it continues delivering power
quite happily. It's only a once-off initialisation that's needed to
get the regulator up and running...
Thanks
Etienne
On 16 Dec 2008, at 4:00 AM, Robert L. Nuckolls, III wrote:
| Quote: |
<nuckolls.bob(at)aeroelectric.com>
At 12:02 PM 12/15/2008, you wrote:
>
> <john(at)morgensen.com>
>
> Any response?
Not that I've heard. I don't think B&C has a circuit
designer any more. If they were interested in the
upgrade I think they would have to farm it out.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
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longg(at)pjm.com
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| Posted: Fri Jan 09, 2009 9:40 am Post subject: SD-8 self excitation |
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Etienne,
First, thanks for doing the test. That gives me more confidence building
an electrically dependent setup using (Z-13) with just one battery. If
I'm able to switch over to the SD-8 before I let the battery get away,
things should begin to look up.
An aside - I am surprised at how many times I have now seen people jump
start electrically dependent engines (dead battery) and rollup for
take-off. There is an assumption in the winter that dead batteries are
perhaps the norm and their actual condition is merely a factor of the
cold weather.
If you lose the alternator shortly after take-off and have just
jump-started the airplane 10 minutes before, how much time do you have?
For me, not a good gamble.
Again, as you have found the reliability of this design is taking off
knowing the condition of your battery and with some comfort that you
have been diligent in its maintenance.
Good Building,
Glenn
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