Today's Message Index:
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1. 04:58 PM - Rotax Charging System (Sebastien)
2. 07:06 PM - Re: Rotax Charging System (user9253)
3. 07:22 PM - Alternator Noise When Touching Metal Airframe Grounds (Jared Yates)
Message 1
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| Subject: | Rotax Charging System |
Hello aeroelectric list,
My friend has a Searey with a Rotax 914. He's currently AOG with a non
charging electrical system. I don't know the Rotax electrical system at all
but the battery is an Odyssey in apparently good shape. System voltage
reads between 11.8 and 11.6 with engine running depending on what loads are
turned on. Increasing engine RPM has no effect on voltage. That's all the
info we have right now.
Would someone who knows this system please get in touch to help diagnose
the problem and suggest a proper fix?
Thank you.
Sebastien
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| Subject: | Re: Rotax Charging System |
The most likely problem is the voltage regulator.
Read this thread, especially post number 6 by Mike Miller.
http://www.vansairforce.com/community/showthread.php?t487
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=480762#480762
Message 3
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| Subject: | Alternator Noise When Touching Metal Airframe Grounds |
I've always had various levels of alternator and strobe noise in my audio
system, and have never been able to track down and eliminate the problem.
Today I was flying lots of short hops in the warm weather, sweating more
than usual, and I noticed an interesting clue.
The noise got much louder when I touched the metal part of the push/pull
throttle control. So then I tried the mixture, and prop controls, same
thing. Then I tried the ceiling-mounted aluminum elevator trim wheel (which
doesn't connect to the engine, of course), same thing. Touching the screws
that hold the instrument panel in place, or the aluminum air vent in the
panel did not generate the noise.
I'm not really sure where the circuit path is in this case. The headset
only makes contact with me through insulators like the leather ear seal
covers and the furry pad at the top. My shoes have rubber soles, and seat
upholstery is the only other thing I'm in contact with.
Has anyone encountered this before, and figured out what was causing it? It
almost reminds me of being able to make noise by pointing my fingers near
the heated windshield of some old plane I flew once. Sort of a windshield
theremin
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