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Date: Sun, 05 Dec 2004 20:08:35 -0500
Subject: Re: [FlyRotary] Re: gear drive for distributor and oil metering
	pump
From: Bulent Aliev <atlasyts@bellsouth.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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On 12/5/04 8:03 PM, "Charlie England" <ceengland@bellsouth.net> wrote:

> 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.
>> 
> Try your John Deere dealer. I know 20A versions are available, & I think
> that there's a 30A version as well. They are also found on Yanmar (sp?)
> tractors. The 20A one is not much bigger than the Mazda crank angle sensor.
> 
> I've been asking about using that shaft for an alt. drive for a while
> but this is the 1st interest I've seen from others. I like the idea of
> using it to run the engine electronics independently with the aircraft
> electrical system as backup.
> 
> The questions are: will the shaft take the load, & will the alt. make
> enough current at cruise to supply the engine's needs?
> 
> Charlie
> 

There is a 15A Cubota also.
Bulent