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Date: Wed, 23 Feb 2005 13:22:49 -0500
From: Ernest Christley <echristl@cisco.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Motorcycle generators
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>     Do you know the diameter of this unit, and the thickness?  I do
>     think the idea is the best I've heard, but it might take a custom
>     built unit to do this.  I would bet we could get someone to build
>     one, since everyone who's purchased one of Tracy's drives could
>     use it, and would probably want to.  
>      
>     Cheers,
>     Rusty (the network guy today)
>      
>     We should not overlook the disadvantage of PM alternators. At
>     higher operating speed, the not used output will have to be
>     dissipated. This is the main reason why automotive alternators are
>     regulated by the exitation system.
>     FWIW.
>      
>     Richard Sohn
>     N-2071U
>

Rusty, I was looking late last night, but 1" thick comes to mind.  
Extrapolating from the pictures, I would guess about 6" in diameter?  On 
the gearbox I have, it should be a comfortable fit, even with a few 
bolts sticking out.  With a little luck, the stator could easily be 
situated to fit over any bolts.  I'm pretty sure the effects of any 
induced eddy currents will be insignificant. (There I go guess again.)  
But a couple of solid rivets will be plenty enough to hold the rotor, 
and the center splines could be turned of in a lathe with a 1" bit 
quickly enough.  And now that we have Bill saying that we won't have to 
rewind the coils, this just looks to easy.

Richard, that is what I thought.  I was wrong, but you may not be 8*)  
The old regulators dumped the excess current to ground through a 
resistor.  The newer ones (like 1970 is new), just block the excess 
electrons.  In my mind, I picture them loading up like a spring until 
the motive force of the magnets pass, when they then unload, releasing 
their energy and doing absolutely nothing.