flyrotary@lancaironline.net Mailing List Archive

Rich,

On my 3-rotor Lancair ES, I chose dual Geo Metro alternators and dual PC680 batteries. Two Geo alternators weigh just slightly more than one RX-7 alternator. There have been times when I had to resort to shutting down one alternator and running the entire system off one Geo alt. via cross feed. That was a non-issue as one Geo alt. will run things just fine as long as I'm not running the pitot heat. Dual batteries are connected in parallel during starting only. It is wired per Aero-Electric Z-14 schematic.

Mark S.

On Tue, Jul 17, 2012 at 3:04 PM, <ARGOLDMAN@aol.com> wrote:

Anybody thinking about the LI (Ballistic) batteries. Their power and specs (2-4Lbs) seem too good to be true. Apparently they have solved the fire problem plaguing cell phone and computer batteries.

Starting should be no problem. I do wonder about their, as well as AGM, capacity in the case of Alternator failure. (time with power)

Am knee deep in wiring as I write this. Trying to decide on dual alternators.

The rotaries are hungry for electricity (EFI, EI, fuel pumps, etc).

My primary alternator is the standard Renesis 100A type. I will externally regulate it. The aux, --unknown --possibly a 20A B&C, I have their aux that fits into the vacuum drive.

Rich

In a message dated 7/17/2012 2:35:50 P.M. Central Daylight Time, BRogers@FDIC.gov writes:

The Odyssey PC 680 is more than enough to start your engine That is what I use. See the following link. http://www.odysseybatteries.com/battery/pc680series.htm

Bob J. Rogers

Mustang II - N62BT

Mazda 13b Turbo

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy
Sent: Tuesday, July 17, 2012 2:18 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Electrical

I used Odessy (sp?) AGM type batteries. 17 AH in the -4, 28 AH in the -8.

Tracy

Sent from my iPad

On Jul 17, 2012, at 8:14 AM, Stephen Izett <steveizett@me.com> wrote:

> Thanks Tracy

> I'll look forward to reading your notes when you can send it.

> What battery/s do you/have you use?

>

> Cheers

>

> Steve

> On 17/07/2012, at 10:04 PM, Tracy wrote:

>

>> Hi Steve,   I sent it to the list just before leaving on vacation. Unfortunately I later found that the message got bounced for size limitations. Can't seem to edit it down to size on this iPad so will do that when I get back in August.   Will see if I can find a picture editing utility that works on iPad and maybe get it done sooner.

>>

>> My RV4 & 8 have just the basics, stock RX-7 alternator and a single battery that I check for capacity every annual.   The significant details are in the PHYSICAL details of the layout. Digital electronics and inductive spikes from coils, solenoids, injectors, etc see a long wire as an open circuit during the first few nanoseconds.   This is the factor that is most difficult for builders not familiar with electronics to understand. This isn't important with carburetors, distributors & points or magnetos but when you introduce a digital computer into the mix it's a different story.

>>

>> Tracy

>>

>> Sent from my iPad

>>

>> On Jul 16, 2012, at 10:55 PM, Stephen Izett <steveizett@me.com> wrote:

>>

>>> Tracy

>>>

>>> Have you got any further with your electrical wiring description you mentioned earlier.

>>> Also, what setup do you have in the RV4 & 8 ?

>>> What battery/s electrical system do you employ?

>>>

>>> Steve Izett

>>>

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