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Date: Sun, 03 May 2009 21:01:34 -0400
From: Ernest Christley <echristley@nc.rr.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Harley Davidson Generator
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Todd Bartrim wrote:
> I'm thinking about the cooling issue that you are addressing with fan 
> blades. How much heat do you think it will generate? I'm 
> thinking/hoping not much. I don't know about the original Harley 
> install, but as this is commonly used source of power, I got to 
> looking at my Ski-Doo, ATV and dirt bike. In everyone of them the 
> stator/rotor is completely sealed up and is not liquid or oil cooled. 
> And I've never had issues with them. It would be a simple matter for 
> me to put a small baffle at the exit of one of the evap cores that I 
> use for cooling and direct some of the air over the rotor, but due to 
> the tight fit, not much air would find it's way under to the stator.
I don't know what sort of heat load it'll generate, but it is almost 
immaterial to my installation.  For me, he intake air will be flowing 
over it regardless.  I've been told that PM alternators are only 50% 
efficient.  I find that hard to believe;  that would be a 500W heat 
source for a 40A generator.  But even at that worst case, it isn't an 
issue for me.

-- 

http://www.ernest.isa-geek.org