Message-Id: <5.1.1.5.2.20040615070316.012675f0@localhost>
Date: Tue, 15 Jun 2004 07:16:50 -0500
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
From: Mark Steitle <msteitle@mail.utexas.edu>
Subject: Re: [FlyRotary] Small alternator?
In-Reply-To: <list-152752@logan.com>
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Jim,
I went with the Geo Metro alternator.  It is about the size of a one pound 
coffee can, but shorter.  It weighs about 5# and is rated around 55-60 amps 
and is internally regulated (I converted it to external 
regulator).  They're also used on many other small imports.  The only 
differences I've seen is in the mounting portion of the housings.  The one 
I bought has tabs which match perfectly to the Mazda water pump housing.

One more thing.  The pulley was only 2" diameter, so I used a Honda Prelude 
power steering pump pulley which is 4" diameter.  My crank pulley is 5-1/2" 
dia.  This will reduce the max alternator rpm's from > 20,000 to about 
10,500.  As you may have guessed, I'm running the 2.85 psru.  To use it, I 
had to remove the teeth from inside the hub.  These are very cheap on ebay.

Let me know if you want to convert it to external regulation and I'll send 
you a step-by-step on converting these.

Mark S.

At 06:21 PM 6/14/2004 -0400, you wrote:
>Jim Sower (email: canarder@frontiernet.net ) asked me to post the following:
>
>I believe there was a thread on this list a few months ago about compact
>alternators. I seem to recall someone being very enthusiastic (and
>rightly so) about a ~ 70 amp unit that was about the size of his fist.
>Don't recall if it was PM or not, internally regulated or not. I am
>looking for the smallest unit I can get that is internally regulated and
>has at least 60 (preferably >70) amp output.
>Could someone give me a heads up on application (... 97 Tercel, etc.)
>Thanks in advance .... Jim S.
>
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