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Date: Tue, 05 Oct 2010 16:47:00 -0400
From: Ernest Christley <echristley@nc.rr.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Permanent Magnet Alternators
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Lehanover@aol.com wrote:
> I have an electric motor for my model planes that has extremely 
> powerful magnets and a dozen or so coils.
>  
> It is call an outrunner. No brushes. Coils are stationary. The magnets 
> are in the outer shell which rotates.
>  
> Ball bearings. Very well made. three wires out in a "Y" winding 
> pattern. Just 3 diodes makes it an alternator
> with a DC output. Weight is under one pound. Can take up to 40 amps as 
> a motor. Unknown as an alternator. Flies a 6 pound model.
>  
> http://www.hobbypartz.com/monsterpower-46--670kv--outrunner-brushless-motor.html
>  
> They come in many sizes and capacities. A motor controller is used to 
> generate a moving flux field to make it a motor.
>  
> These are very high efficiency motors and were designed for disc drive 
> in computers. They are electrically quiet and are brushless.   
>  
> Could make a very compact RAT. Ram Air Turbine emergency power source. 
> Maybe enough for ignition anyway.
>  
> Available in hundreds of sizes down to pencil eraser size.
>  
> Just a thought.
>  
> Lynn E. Hanover
This is just WAY TOO COOL!!  The have a larger one.  60amps in a 3 inch 
package.

Lynn, do you have any documentation stating a max RPM?