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Date: Thu, 24 Feb 2005 08:52:37 -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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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. 

If we stipulate that we're talking about inflight failures, even a 
minimal (15-20 amp) backup alt will extend my battery life waaay beyond 
fuel exhaustion.  Remember, we've been talking about batteries that will 
fly us for an hour or more all by themselves.  It doesn't take much of a 
backup alt to reduce that discharge rate enough to extend the battery 
life to more hours than we have fuel for.

Even with EFI, EWP electrical retractable gear, 20 amps would bring us 
home ... Jim S.

WRJJRS@aol.com wrote:

> In a message dated 2/23/2005 9:42:42 PM Pacific Standard Time, 
> canarder@frontiernet.net writes:
>
>     <... If you have a real AMP-sucker they can probably stack two ...>
>     It's not there for normal operations.  It's to get you home.  Even
>     10 or 15 amps would greatly extend battery life.  That's the
>     object of the exercise.
>     Jim S.
>
> Partially true Jim,  If the output is enough for you it can be your 
> primary. Of course if you used a belt driven alternator as a primary 
> it would be fine as a backup.
> Bill Jepson