---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sat 06/09/18: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 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 _____________________________________ Time: 04:58:42 PM PST US From: Sebastien Subject: AeroElectric-List: 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 ________________________________ Message 2 _____________________________________ Time: 07:06:19 PM PST US Subject: AeroElectric-List: Re: Rotax Charging System From: "user9253" 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 _____________________________________ Time: 07:22:34 PM PST US From: Jared Yates Subject: AeroElectric-List: 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 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.