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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
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