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Date: Mon, 06 Dec 2004 23:30:59 -0600
From: Jim Sower <canarder@frontiernet.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: gear drive for distributor and oil metering pump
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What about those little PM alternators that John Deere has on lots of stuff?


Ernest Christley wrote:

> David Carter wrote:
>
>> Wonder if "we" could come up with an alternator to drop into that hole -
>> some back-up "juice" for our "electrically dependent engines".
>>
>> David
>>
>
> That is exactly what I've been thinking, David.  Steve stopped by to 
> look at my project last week, and we were discussing it. Thanks to Mr. 
> Leonard over there, I now know what to look for.
>
> I need to find a 2/3HP or 500W or 30Amp generator/DC PM motor.  It'll 
> be 3" or 4" in diameter, with a couple inches of shaft sticking out.  
> I'm thinking it would be easy enough to key the shaft to fit as a 
> direct replacement for the metering pump.
>
> I don't have the numbers with me, but I was doodling with them a while 
> back.  I figured something like a couple of in.lb. of torque on the 
> worm gear to produce 500W at 6000RPM.  I now know the gear would turn 
> at half that, so it is still less that 5in.lb. on the gear.  The 
> upshot is that 3000RPM motors are much more abundant that 6000RPM motors.
>
> I'm trying to source a part.  I'm also thinking that a standard 
> alternator can be made to fit by cutting down the housing.
>