AeroElectric-List Digest Archive

Sun 04/03/16


Total Messages Posted: 2



Today's Message Index:
----------------------
 
     1. 09:21 AM - Rotax alternator problem (Robert L. Nuckolls, III)
     2. 03:32 PM - Re: Rotax alternator problem (user9253)
 
 
 


Message 1


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    Time: 09:21:02 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Rotax alternator problem
    >I am building a Bristell RG powered by Rotax 912ULS and I was >wondering if you could help me. > >There is the Rotax own alternator build in already that produces >around 18A and I intend to install the BC425-H as well. > >My question is how I can wire this in parallel just as per figure >17-8 as Auxiliary Alternator with Autoswitching. I am not too sure >how I can make the Rotax 18A alternator to work with the BC425-H. "Autoswitching" is of little or no operational value . . . your airplane is not going to crash and burn because of primary alternator failure . . . the low voltage warning light comes on, you turn off main alternator and turn on standby alternator. If you're drinking a cup of coffee when the light comes on, finish the cup before you start flipping switches . . . you don't want your clothes to smell like coffee when you land. Wire each alternator to the system as if it was the only alternator. Fit the system with low voltage warning. Fly comfortably. Bob . . .


    Message 2


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    Time: 03:32:28 PM PST US
    Subject: Re: Rotax alternator problem
    From: "user9253" <fransew@gmail.com>
    Are you sure that a second alternator is required? Hundreds of Van's RV-12s are flying with only the Rotax 912ULS built-in alternator. Many of those RV-12s have dual glass panels and LED strobes and a LED landing light. The landing gear of the Bristell RG can run off from the battery for the short time it operates. The Rotax alternator has no moving parts except for the engine flywheel (with permanent magnets). So it is highly unlikely to fail. However, a backup Rectifier/Regulator could be considered. -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=454515#454515




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