Steve,
From the testing you have done it sounds like the starter is causing a voltage drop
sufficient to render the rest of the electrical system to become marginally operative.
I had a similar issue when I moved the battery from close to the engine to further away for
weight and balance reasons.
Like you, I have a two battery system.
An essential bus for all the engine related electronics and the main bus for everything else.
I moved the starter to the main bus which is isolated from the essential bus until the engine starts. Then the two buses are connected via a contactor so there is no voltage loss.
This solved the problem of the starter dragging down the electronics voltage.
Hope you can solve your problem the same way.
Jim
--- On Sat, 11/21/09, Steve Brooks <cozy4pilot@gmail.com> wrote:
From: Steve Brooks <cozy4pilot@gmail.com>
Subject: [FlyRotary] Re: Need a sanity check
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Date: Saturday, November 21, 2009, 12:00 PM
Bobby J. Hughes wrote:
> Steve,
>
> I removed the battery cable running to the starter, and using a spare
> battery, and a jumper cable for the ground, I cranked the starter with
> this battery, which was isolated from the airplanes electrical system.
> It had good spark on both rotors .... yeah !!!
snip
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