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From: Doug Mueller <rotaryrx6@cox.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Two Alternators?
Date: Tue, 24 Jan 2006 13:06:40 -0500
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Hey Mark, I would like to encourage you as well as all other builder/flyers to 
have a different mind set. When an alternator should fail or any electrical 
problem exist regarding batt or alt, It is an emergency not an opportunity. It 
is just like any problem with cooling. (ie Water pressure loss or Coolent temps 
exceeded) I guarantee that this approach will save your life one day. We can 
not have these ideas sponing these go/go actions. The homebuilt community 
cant afford this type of advertisement, in a day an age when insurance 
companies are looking to ditch insuring high risk mentality. It may be an 
oversight or a mistatement on your part but I implore all builder/flyers that 
the dual alternator/battery system is for redundency to get you to the 
realestate safely not to make it to point B. :)

> 
> From: "Mark R Steitle" <mark.steitle@austin.utexas.edu>
> Date: 2006/01/24 Tue AM 10:20:28 EST
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Subject: [FlyRotary] Re: Two Alternators?
> 
> John,
> 
> I forgot to answer your question.  Each battery is connected
> independently to its own alternator through an individual contactor.  If
> one alt fails, I can shut it off by opening the field (good argument for
> external regulated alt) and close the x-feed contactor to connect both
> batteries in parallel.  So, a failed alternator should be a non-event...
> just open the field on the failed alt, flip the x-feed switch and
> continue on to my destination.
> 
>  
> 
> Mark S.  
> 
>  
> 
> ________________________________
> 
> From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
> Behalf Of John Slade
> Sent: Tuesday, January 24, 2006 8:00 AM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] Re: Two Alternators?
> 
>  
> 
> Mark,
> 
> How do you charge the backup battery? A diode? Got a part number?
> 
> I'm just switching a contactor right now, but I'd like to isolate the
> backup.
> 
> Regards,
> 
> John
> 
> 	-----Original Message-----
> 	From: Rotary motors in aircraft
> [mailto:flyrotary@lancaironline.net]On Behalf Of Mark R Steitle
> 	Sent: Tuesday, January 24, 2006 8:21 AM
> 	To: Rotary motors in aircraft
> 	Subject: [FlyRotary] Re: Two Alternators?
> 
> 	Doug,
> 
> 	I have dual alternators and dual batteries per Aero-Electric
> Z-14 architecture.  I'm using the small 55amp ND units.  They weigh
> about half of what the Mazda alternator weighs, so I rationalized that
> there was very little weight penalty to using two alternators, but a
> significant safety improvement.  With an electrically dependent engine
> and all electric panel, I decided this was the way to go for me.  The
> cross-feed contactor connects both Odyssey batteries during starting, so
> I am able to use smaller batteries than would be required to start the
> 3-rotor with only one battery.  Every annual, I plan on replacing the
> main battery, rotating the 1 year old main battery to the aux position,
> and move the 2 year old aux battery to my Goldwing motorcycle.  That way
> the main battery will be less than one year old, the aux battery will be
> 1 - 2 years old, and the motorcycle battery will be 2-3 years old.  I'll
> send you a picture off-line.  
> 
> 	 
> 
> 	Mark S. 
> 
> 	 
> 
> 	
> ________________________________
> 
> 
> 	From: Rotary motors in aircraft
> [mailto:flyrotary@lancaironline.net] On Behalf Of DLOMHEIM@aol.com
> 	Sent: Tuesday, January 24, 2006 6:11 AM
> 	To: Rotary motors in aircraft
> 	Subject: [FlyRotary] Two Alternators?
> 
> 	 
> 
> 	I am debating the future use of two batteries vs. two
> alternators and I was wondering if anyone in the group has mounted a
> second alternator and if so if they had any pictures of its mounting
> location, etc.
> 
> 	 
> 
> 	Thanks for the information.
> 
> 	 
> 
> 	Doug Lomheim    RV-9A / 13B
> 
> 	OK City, OK
> 
> 
> 

Doug Mueller
RX-6 13BT
N900DM
Boulder City(61B),Nevada