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Date: Sat, 19 Feb 2005 10:28:17 -0700
From: Bob White <bob@bob-white.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: 2nd battery Re: Amps required to run engine & amp- hours
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Wasn't someone talking about using the injector pump drive to drive a 
backup alternator?  I will opt for the backup battery until I find a 
good solution for a second alternator. 

Bob White


On Fri, 18 Feb 2005 23:58:57 -0600
Jim Sower <canarder@frontiernet.net> wrote:

> <... 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
> 
> 


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