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Date: Tue, 21 Jun 2005 18:22:20 -0600
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
From: Bill Dube <bdube@al.noaa.gov>
Subject: Re: [FlyRotary] Re: Dc-DC regulator (was: Racemate Alternator)
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>
>  OK now about the alternator; several things have to work to be able to 
> use these things. Since the alternator is usually on the outside of the 
> assembly most do not have a large center opening that we can say pass the 
> e-shaft through. For a E-shaft concentric alternator we need a HOLE about 
> 40mm (at least) to fit the shaft through regardless of which end of the 
> engine we run the alternator on. We also need to mount the alternator 
> windings to the engines cases safely. This is doubly true of the magnetic 
> rotating assembly. The large center hole is the area I expect the most 
> trouble with.

         Looking at the picture of the Harley alternator, I would guess the 
hole in the stator (coil assembly) is 2 inches, maybe more. The hole in the 
rotor (magnet assembly) appears to be splined, but looks simple to machine 
to whatever diameter you would need.

         Bill Dube'