Mailing List flyrotary@lancaironline.net Message #45961
From: George Lendich <lendich@aanet.com.au>
Subject: Re: [FlyRotary] Re: Harley Davidson Generator
Date: Mon, 4 May 2009 07:55:37 +1000
To: Rotary motors in aircraft <flyrotary@lancaironline.net>

Todd,
Cooling air is a good idea, the permanent magnets fail at a certain temperature, can't remember what that is though.
George ( down under)
Not so sure about that. I still have allot of things on my plate and I don't want to rush things, but will try to keep it on a front burner now. You've got to be getting close to firing it up?

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'm hoping this won't be an issue. What I'm hoping is that once the issues around fitting it in place are resolved it will prove to be a reliable, maintenance free back-up power source without adding any undue complexity. Of course this what we are striving for with everything in our airplanes. But previously I've found that some simple solutions to problems end up causing enough little other issues that the complexity results in anything but a simple solution. And once time & money gets invested then there becomes an incentive to keep flogging a dead horse.
    I believe the concept is sound, the issue will be in making it fit into existing RD-1? installations. If it is proven sound, then maybe Tracy may consider working it into his RD-1 design to facilitate easier installation, however I suspect that Tracy probably has too much other stuff on his plate to get started reworking an already proven PSRU.

Todd
C-FSTB


On Sun, 2009-05-03 at 12:08 -0400, Ernest Christley wrote:
Todd Bartrim wrote:
> Hi Ernest, Kelly and others;
>     I promised myself I wasn't going to do any experimenting this time 
> around, but here I go again.....

It's in your blood, ain't it.
Sounds like you'll have your flying before I even get a first run.

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