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From: Bulent Aliev <atlasyts@bellsouth.net>
Subject: Pusher cooling
Date: Wed, 10 May 2006 22:06:08 -0400
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>


On May 10, 2006, at 5:07 PM, ARGOLDMAN@aol.com wrote:

> In a message dated 5/10/2006 10:11:09 A.M. Central Standard Time,  
> eanderson@carolina.rr.com writes:
> Great to hear the good news, Al, a major milestone for certain.
>
> Regarding your wing root cooler. I can only think of four  options,  
> 1.  The water spray as used by Tracy - as you know very effective -  
> but of course requires you to carry the water 2.  Possibility of a  
> permanent fan to pull air through - but I would be a bit concerned  
> about it windmilling at cruise.  3.  Possibly use of an external  
> fan to push air through during static ground operations (such as  
> tuning your engine) - but would require a considerable ability to  
> move air. 4. Alternative position - I would assume that would  
> probably be the least desirable solution.
>
> Al,
>
> I too am thinking about solving this problem. I have some Ideas,  
> none of which I have tried. I have a cabin heater and fan, a multi  
> pass device. If I use oil in it, instead of dumping the heat into  
> the cabin, I can dump it overboard lowering the oil temp. If I do  
> water heating, I can do the same thing to lower the water temp,  
> however that will do little for the oil temp. The second thing that  
> I thought about is a dedicated oil cooler fan which could hinge  
> down, seal the output part of the oil cooler duct and pull the air  
> through when on the ground. When in flight, the fan would be out of  
> the way and not be in the airstream. It would thus not wild mill  
> when  flying.
>
> Adequate Ground cooling is obviously vital. Think of it in "worst  
> case" terms. I remember being in a long line for takeoff at OSH in  
> 2003, with my Midwest rotary, praying that things would speed up as  
> my temperature gauge got closer and closer to redline. I had to  
> pull out of line, let the engine cool and get back into line in  
> order to keep from glowing. I wonder if extending the exhaust tube,  
> from the oil cooler, to nearer to the prop would help.
>
> Other thoughts????

Al, When designing the cooling on my CZ, I paid more attention how to  
get the air OUT from the cowling, since we don't have the means to  
push it in, at taxi or low speeds. My exhaust gasses work the turbo  
for more HP, but also they are used in the augmentor tube to suck and  
expel the hot air from under the cowling. All my coolers are  
discharging the heated air inside the cowl. I also have installed a  
small fan on the other cowl opening to pull hot air out. I hope it is  
a temporary measure for initial testing. Nick Ugoliny (LEZ) installed  
an air outlet on the top cowl close to the wing and the eng. temps  
dropped. I did something similar but have not tested it yet.
I don't know if any of these will work for you, but just general  
info? Also you still have OAT in the 60's. I'm trying to cool the  
beast with OAT in the 90's.
Good luck and keep us informed.
Buly
http://tinyurl.com/dcy36