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Rotax 914 Generator, Alternator, Starting and Fuel Pump Co

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nuckolls.bob(at)aeroelect
Guest

Posted: Fri Jan 22, 2016 5:21 pm Post subject: Rotax 914 Generator, Alternator, Starting and Fuel Pump Co

At 09:01 AM 1/22/2016, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com>



 1. Over voltage protection.

 Bob Nuckolls made a demonstration board for an court trial.  He made a movie showing what happens when fuses or circuit breakers are in series.  If Bob is reading, maybe he can provide a link to that movie. 	


 The specific video is at:



  http://tinyurl.com/ppdv5fg



 The sum total of the accident analysis can be

 seen at:



  http://tinyurl.com/msfmldj



 

  	  Quote: 	
		    It was interesting. Anyway, even a 10 amp fuse might blow before a 5 amp series breaker trips. 	


   I've opened 20A fuses through 5A breakers



  	  Quote: 	
		  5. The reason that I suggested using a smaller breaker for the output of the 20 amp dynamo is that in the event of a short circuit, a 20 amp breaker might not ever trip because the dynamo will struggle to put out that much current. 	


    I'm aware of NO engine driven power source

    that is capable of opening its own output

    protection. Fuses, breakers, fusible links

    and current limiters protect wires . . . nothing

    more. Further, that protection needs to be

    installed facing the probable source of energy

    feeding the fault. In our itty-bitty airplanes,

    this is almost ALWAYS the battery.



    Hence, alternator output protection goes as

    close to the battery as practical. It is robust

    enough to stay closed under most energetic output

    the alternator can produce. I've written about

    the "breaker designed to nuisance trip" that

    was built into tens of thousands airplanes . . .

    a 60A breaker on 60A alternator.



    In the case of feeder protection for a 10-20A

    PM alternator/rectifier-regulator, a 30A fuse

    or mini current limiter is not too big and it

    CANNOT be nuisance tripped by alternator output.



    If some failure puts the alternator itself at

    risk . . . so be it. Let the alternator smoke,

    protect the wires and go to plan-B.



 

   Bob . . .

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nuckolls.bob(at)aeroelect
Guest

Posted: Fri Jan 29, 2016 5:51 am Post subject: Rotax 914 Generator, Alternator, Starting and Fuel Pump Co

At 01:01 PM 1/22/2016, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "Ross Home" <rossmickey(at)comcast.net>



 With a download time of 11 hours, I think I will pass even though it looks

 interesting.



 Thanks for posting it though. 	


   send me your mailing address and I'll put

   the set of files on a CD for you . . .



 

 

   Bob . . .

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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