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Date: Sat, 19 Feb 2005 21:49:32 -0600
From: Jim Sower <canarder@frontiernet.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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YES.

Mark R Steitle wrote:

>Assuming you lose your alternator belt, won't battery-only operation last much longer than not having any water circulation?  (unless you are equipped with EWP)
>
>Mark S.  
>
>
>-----Original Message-----
>From: Rotary motors in aircraft on behalf of Jim Sower
>Sent: Fri 2/18/2005 11:58 PM
>To: Rotary motors in aircraft
>Subject: [FlyRotary] Re: 2nd battery Re: Amps required to run engine & amp- hours available
> 
><... If the 2nd alt. is big enough to carry essential loads, it can be 
>lighter ...>
>
>The problem is that for it to be a true /backup/ and not merely 
>/redundant/, you would have to figure out a way to drive it - preferably 
>at the other end of the engine.  Two alternators driven by the same belt 
>(or belts anywhere near each other) doesn't solve much.  Particularly in 
>light of the fact that belt failures probably outnumber electrical 
>failures, and when a belt fails you don't know /what/ it's going to 
>cascade into.
>
>Where you gonna put the 2nd alt? ... Jim S.
>
>
>Charlie England wrote:
>
>  
>
>>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
>>
>>
>>
>>
>>    
>>
>>>> Homepage:  http://www.flyrotary.com/
>>>> Archive:   http://lancaironline.net/lists/flyrotary/List.html
>>>>        
>>>>
>>    
>>
>
>  
>
>>> Homepage:  http://www.flyrotary.com/
>>> Archive:   http://lancaironline.net/lists/flyrotary/List.html
>>>      
>>>
>
>  
>
>------------------------------------------------------------------------
>
>  
>
>>> Homepage:  http://www.flyrotary.com/
>>> Archive:   http://lancaironline.net/lists/flyrotary/List.html
>>>      
>>>