Mailing List Message #65342
From: Andrew Martin <>
Subject: Re: [FlyRotary] Electrical power
Date: Sat, 16 Nov 2019 07:49:56 +0800
To: Rotary motors in aircraft <>
I wont give schematics as mine grew into a mess as I built the plane and also needs cleaning up.
But as for power supply.
Main power is 80a alternator, modified to external B&C regulator.
Backup power is 40ah starting battery. Avionics buss has small agm battery connected through switch & diode to keep avionics alive during starting.
The alternator is quite heavy. But has much better bearings than lightweight alts. 
The battery is bigger than I needed but is nice as will turn motor over fast for starting even if partially discharged, and I needed weight in tail so it may as well be useful weight.

On Sat, 16 Nov. 2019, 7:01 am Stephen Izett, <> wrote:
Hi Guys

I’m reviewing our electrical system and thought as its a critical system i should get the wisdom of what other decided as far as risk.
If people have circuit diagrams that would help.
I have an electronics background.

My key questions are around:

Battery/s (single/dual) If dual - how have you implemented?
Alternator (Capacity to control - Over Voltage etc.)
Switching (How you switch the electrons on/off - I recently had a Narva Ignition switch failure)
Failure modes and emergency response plans

Much appreciated.

Steve Izett
Glasair Super IIRG - In Phase #1 testing.
Perth Western Australia

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