Mailing List flyrotary@lancaironline.net Message #63306
From: Charlie England <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Permanent Magnet Backup Generator
Date: Mon, 17 Apr 2017 07:49:27 -0500
To: Rotary motors in aircraft <flyrotary@lancaironline.net>


On Mon, Apr 17, 2017 at 4:31 AM, Todd Bartrim <flyrotary@lancaironline.net> wrote:
Many years ago we discussed on the list various ways to implement backup electrical sources for our electrically dependent engines. A great amount of discussion was around permanent magnet type of generators. 
   An idea was hatched and discussed, then forgotten. Except I didn't. Some years and a few sleepless nights later I set upon achieving this. Most of the work was done and reported to the list quite a few years back, but at that time I knew I had to set it aside for some time as I had other commitments. 
  At last report I had finalized the mechanical aspect but had made no attempt to integrate it into the electrical system. I've now finalized this and yesterday ran the engine for the first time. Everything worked excellent! So far it seems to have been a tremendous success.
  So I have updated my word document of the procedures for this modification. Including a wiring diagram. 
For your entertainment I've put it on Google Drive in Word format where it can be accessed at the following link
Thanks for the great writeup. I took the easy way out & just added a 2nd ND alternator where the a/c compressor normally rides on a Renesis, but it would be nice to save ~5 lbs using the motorcycle alt.

Given that the mod is do-able on a stock RWS drive, if anyone ever decides to resume production it would be nice to tweak the dimensions on the input end enough to allow a simple bolt-on of all the components.

Charlie
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