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Alternator selection

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nuckollsr(at)cox.net
Guest

Posted: Sat Jan 27, 2007 9:40 pm Post subject: Alternator selection

At 08:59 PM 1/27/2007 -0800, you wrote:



 	  Quote: 	
		  Well put Lee.  Thank you for a well written and thought out post.



I m working hard to get my plane flying by this summer and have purchased 

a IR ND, but I m really wondering if that is the right choice.  I haven t 

wired the alt system yet so it would be easy to change, but like you I am 

really wondering what the best solution is at his point so I can charge 

ahead with the confidence that I m building a safe bird.



Mike C.


	


   The IR alternator is not inherently unsafe. But depending on

   various design features of the thousands of mostly same but

   different parts available, the risk of ov conditions is not zero.

   I'm aware of no SE aircraft that become "unsafe" because of

   the inability of an IR or ER alternator to perform as desired.



   There have been some tense moments and some very expensive

   events but nobody I've heard of had any close brushes with

   injury or death.



   It's a matter of shared design goals. I believe I've adequately

   described mine which are based largely on what we've practiced

   in GA for the past 70 years or so. If you share those goals,

   know that they cannot be met with any IR alternators we're aware

   of (except perhaps for Plane Power which may offer direct control

   of the field windings along with compatible ov protection).



   But know too that the problem of integrating the stock, plain-vanilla

   IR alternator into the stated design goals is all but a sure bet

   needing only $time$ to realize . . . but will probably happen this

   year. You don't need to make the decision until perhaps one week

   before first flight . . .



   Bob . . .

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mwcreek(at)frontiernet.ne
Guest

Posted: Sun Jan 28, 2007 10:23 am Post subject: Alternator selection

Bob,



Thanks for your authoritative update putting the issue in perspective.  We

await the ultimate solution for IR control, when it becomes available.



Mike C.

--

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