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Date: Thu, 24 Feb 2005 13:25:05 -0600
From: Jim Sower <canarder@frontiernet.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: E-shaft permanent magnet alternator
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<... eliminate the belt driven alternator entirely ...>
OK.  That makes sense.  I missed a lot of the discussion.  One at each 
end would be nice if we can do it.  My inclination would be to stick 
with the belt driven unit since they're $30 and proven.  Perhaps move to 
two crank driven units when they're more proven on our application.

I'll just watch you and follow when yours works :o) ... Jim S.

Ernest Christley wrote:

> Jim Sower wrote:
>
>> I don't see the point of two primaries (unless you're using 1920s era 
>> technology like mags).  My notion is to have a good, solid ND primary 
>> and either a [small] backup battery or [small] backup Alt.  If I have 
>> redundant primaries, I'm probably too heavy, and (just me) more 
>> tempted to drive around with one failed while I wait on parts or 
>> something.
>
>
> Jim, my goal is to eliminate the belt driven alternator entirely.  No 
> belt.  No pulley.  No heavy alternator hanging off the side of the 
> engine on a heavy cantilevered bracket.  No need for a cowl bump to 
> give it clearance.
>
> I'm looking for at least a 35A primary and 20A secondary.  I'm 
> actually quite comfortable with the idea of flying with only a 
> primary, but if you look at these things they are like an alternator 
> with all of the heavy parts thrown out.  The backup is cheap, weight 
> wise.  My guess is that the difference between the 20A and 35A unit is 
> the wire guage used in the coils, and you'd need an ounce scale to 
> tell the difference.
>
>>>  Homepage:  http://www.flyrotary.com/
>>>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
>>
>
>