Mailing List flyrotary@lancaironline.net Message #64030
From: Ernest Christley echristley@att.net <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: alternator
Date: Sat, 16 Jun 2018 00:48:48 +0000 (UTC)
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
When I did it, I went to a local repair shop and asked if they had in damaged units that had been replaced.  Then I had a free sample to trial fit with.


On Friday, June 15, 2018 1:38 AM, "Todd Bartrim bartrim@gmail.com" <flyrotary@lancaironline.net> wrote:


Hi Neil;
   I can't confirm for certain but yes, 2.77" sounds about right.
  After the flywheel and damper drive modifications to increase clearance, I still only had 1.43" to squeeze it in there, so that is why I also shaved a little off of both sides of the rotor cup and also machined a shallow depression into the backside of the psru backplate to allow mounting the stator close to the plate and still have clearance for the windings.
This link will show a pic of where I measured the 1.43"
  At a little over 1.5" before any modifications to increase that room, then you are much better off than I was when i began. 
   When I decided to try it, I really had no more than the desire & determination to experiment and a "Hairy chested hero" idea that I set down $400 at the local Harley shop as a bet that I could make this work, knowing also that I was modifying an expensive PSRU, that is no longer available for purchase. That gamble paid off for me and I proved that it can be done.
  So I would say that you gotta ask yourself whether this is something that you really want in your own installation and if yes then put that money down on a single rotor/stator and go to work to see if you can make it work for yourself on your own design.
  Then if you are as happy with it as I am with mine, you can figure out at what cost you can offer it as an option.
  If I were in your shoes I don't think that I would go to the trouble if your only motivation is to provide it as an option for others. But if like I said, you want this for yourself as well, then go for it and if successful and affordable, then others can have the option of one as well.

Todd

On Thu, Jun 14, 2018, 19:19 Neil Unger 12348ung@gmail.com, <flyrotary@lancaironline.net> wrote:
Todd,

                   From what I can gather  the ID of the stator is 2.77
inches.  Does that sound correct?    To land a unit from the US or buy
in OZ , the cost is  Pushing $375 AUD or $285 USD.  I have a little over
1.5 inches to mount in between the drive and the plate. Do you remember
what space you had?  Thanks,  Neil.

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