John

I have two batteries connected to a = common bus but both isolated from the bus by Schottky diodes. The digikey part = number is 240NQ040-ND.

Regards,

Joe = Hull

Cozy Mk-IV #991 (Done! In Phase1 = Flight Test 0 hrs)

Redmond (Seattle), Washington

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of John Slade
Sent: Tuesday, January = 24, 2006 6:00 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