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Subject: RE: [FlyRotary] Re: 2nd battery Re: Amps required to run engine & amp- hours available
Date: Sat, 19 Feb 2005 05:36:28 -0600
Message-ID: <87DBA06C9A5CB84B80439BA09D86E69E6CB5E1@MAIL01.austin.utexas.edu>
Thread-Topic: [FlyRotary] Re: 2nd battery Re: Amps required to run engine & amp- hours available
Thread-Index: AcUWSDvTMFgpO4fOTm2l3TTGOC0FRgALwRie
From: "Mark R Steitle" <mark.steitle@austin.utexas.edu>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>

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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. =20


-----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
=20
<... If the 2nd alt. is big enough to carry essential loads, it can be=20
lighter ...>

The problem is that for it to be a true /backup/ and not merely=20
/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=20
failures, and when a belt fails you don't know /what/ it's going to=20
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 ..=20
>> what's 12#? ... Jim S.
>> ---------------------------------
>>
>> Jim, I'm torn between 2nd battery. Tracy had one for a while, but no=20
>> 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=20
>> will have the option to run the 2nd one anytime I'm over water=20
>> flights (a long time from now!) or doing another flight to Alaska.
>>
>> Bernie
>> =20
>>
>
> For those that don't follow the Matronics Aeroelectic list, the=20
> moderator now recommends 2 alternators and only one battery, replaced=20
> 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=20
> good. If the 2nd alt. is big enough to carry essential loads, it can=20
> be lighter than even the 12 lb battery & your endurance isn't battery=20
> 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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