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Date: Fri, 18 Feb 2005 19:26:46 -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 &
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jbker@juno.com wrote:

>Now THAT'S encouraging ... but I think I'll tote a spare anyway .. 
>what's 12#? ... Jim S.
>---------------------------------
>
>Jim, I'm torn between 2nd battery. Tracy had one for a while, but no longer and don't believe ED had one. Flying over the lower 48 without a 2nd battery once I'm past 40 hours does not bother me, but think I will have the option to run the 2nd one anytime I'm over water flights (a long time from now!) or doing another flight to Alaska.
>
>Bernie
>  
>

For those that don't follow the Matronics Aeroelectic list, the 
moderator now recommends 2 alternators and only one battery, replaced at 
each annual inspection. His logic is that modern batteries like the 
Hawker, etc. are so reliable that you aren't any more likely to lose a 
battery *in flight* than a wing while alternators aren't quite that 
good. 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.

Charlie