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Date: Fri, 18 Feb 2005 20:26:05 -0600
From: Charlie England <ceengland@bellsouth.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: 2nd battery Re: Amps required to run engine &
 amp- hours available
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Russell Duffy wrote:

> If the 2nd alt. is big enough to carry essential loads, it can be
> lighter than even the 12 lb battery & your endurance isn't battery 
> limited.
>
> A lot tougher to install, though.
>
> I feel pretty safe with one Odyssey battery, and one alternator.  I've 
> used the current battery for about 2 years, and already have the new 
> one sitting at the hanger.  I think that will be my threshold of pain 
> for replacement of these things. 
>
> As for the alternator, I thought real hard about installing a second 
> one, particularly since they only have that single pulley, and the 
> rest of the engine has dual pulleys.  I finally gave up on the idea, 
> because I just didn't think it was that big of a risk.  Tracy's EM-2 
> is hooked to a "Jumbo Super Bright LED", which is aimed at my face.  
> This thing will burn your retinas, so there's absolutely no way to not 
> see it (before it blinds you).   Since the alternator only weighs a 
> few pounds, I thought about packing a spare in the essential travel 
> tools and supplies.  It is pretty easy to change with just a few tools. 
>
> Cheers,
> Rusty (100% vapor lock free)
>
>
I probably phrased that poorly. I think he says that if you aren't 
comfortable with the alt. & battery backing up each other, then put in 
the 2nd alt. instead of the 2nd bat.

Charlie