nuckolls.bob(at)aeroelect
Guest
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 Posted: Thu Jul 03, 2014 7:07 am Post subject: Alternator problems |
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At 06:31 PM 7/2/2014, you wrote:
| Quote: | Bob,
I have been reading your book ³The AeroElectric Connection² which is very
informative. I have a couple of issues.
First, I have a Sonex with an AeroVee engine (VW) with a permanent magnet
alternator. Something is not working because the battery goes dead. When I
go to start the engine my Grand Rapids EIS shows 12.3 volts, after I have
charged the battery. After I start the engine the voltage goes to 12.1. At
wide open throttle it shows 12.2. After I shut down the engine it showed
12.3
I put a brand new regulator/rectifer from Sonex in the plane. There is
continuity between the two wires coming from the stator. There is no
continuity between either wire and any of the poles of the stator.
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The winding is open.
| Quote: |
When I put my multimeter on the two wires coming from the stator, it showed
AC voltage in the 175 volt range at wide open throttle.
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AC voltage readings on modern multi-meters have to
be tempered with the knowledge that their input
impedance is very high . . . they will detect
AC voltages on conductors in close proximity to
some 'activity' but are in fact not capable of
carrying any power . . . broken.
| Quote: |
If figured if I was getting that many volts I would run a test to see if it
would light a light bulb. It did not.
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Paragraph above confirmed.
| Quote: |
Clearly something is rotten in Denmark, or New Hampshire as the case maybe.
I am open to any help/suggestions as the testing or rectifying (so to speak)
of the problem.
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Stator winding is open somewhere. Does it look over-heated
or smell 'cooked'?
| Quote: |
Second issue. Antennas. In your book page 13-24 you talk about the ³poor
manıs² coax termination. You say to keep the distance between the center
wire and the shielding ground wire as short as possible. My question is
what can the distance be before it is not effective?
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It's ALWAYS effective with deleterious effects
being a matter of degree.
| Quote: | By distance I assume
that you mean the distance between the end of the center wire and the place
where you strip off the shielding wire. I would like to build my own
antenna, but it seems somewhat daunting.
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How about this? http://tinyurl.com/madgr9v
| Quote: |
Thanks for any help. Really liked your book.
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I'm pleased that you found it useful. Suggest you
join us on the AeroElectric List . . . a forum of
with about 1500 other builders wrestling with the
same questions you are . . .
Bob . . .
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