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From: "Bill Schertz" <wschertz@comcast.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-1238969@logan.com>
Subject: Re: [FlyRotary] Cooling non-test
Date: Sun, 16 Jul 2006 16:16:11 -0500
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Bob,
Why do you have the leaf blower at 90 degrees to the inlet tube, I suspect 
you lose a lot of pressure with the plenum box.
Bill Schertz
KIS Cruiser # 4045
----- Original Message ----- 
From: "Bob White" <rlwhite@comcast.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Sunday, July 16, 2006 11:37 AM
Subject: [FlyRotary] Cooling non-test


> Ernest's recent cooling experiment inspired me to try the same.  I
> spent about 1/2 day building the test setup shown in the photo.  I
> don't have a sensitive flow or pressure meter so I tried using a water
> manometer. I pointed the end at the surface of the radiator like a
> pitot tube. Net result, the flow is so slow by the time it exits the
> radiator that I got no indication at all on the manometer.  Not helping
> is the fact that I'm not testing one core, but both water cores and the
> oil core together.  I did get some qualitative data by holding a strip
> of paper against the surface. There was some airflow coming thru the
> cores over the entire surface.
>
> I put the tip of the manometer a foot or two directly in the cone of the
> apparatus (what else can I call it?) and got a pressure of about 1 inch
> of watter. Putting it directly in the end of the leaf blower was about
> 3 inches. So I need a bigger leaf blower!
>
> Since the test didn't tell me a whole lot, I put the prop on and
> started the engine.  This is the first time I've run the engine with
> the cowling on.  It was about 90F, and the temps came up slowly to
> 180-190F. I ran the engine up to 4000 rpm for a while until it started
> running very poorly due to vapor lock.  Photo 2 is an early picture of
> my exhaust system.  Oil and water temps went up to 200-210F and were
> still climbing.
>
> Basically I have a can sitting at 1000F+ heating everything up.  I know
> that I have to shield the thing, but I just haven't gotten to it yet.
> When I took the cowling off, everything on the hot side was too hot to
> touch, including the fuel lines.  One nice touch, I have a small cooler
> to cool the fuel as it returns to the regulator.  It's mounted on the
> engine mount about 3 inches from the unshielded 1000F can so it's doing
> a great job _heating_ the fuel.  The cooler was for the zero return line
> fuel system I was thinking about. I'm not going to do that however. The
> fuel will be returned to the tank.  The exhaust also radiates heat into
> the left radiator.
>
> As of now, I believe the cooling system is doing pretty good, but won't
> be able to tell much more until I get the exhaust system shielded.
> Bill Shertz' pipes straight out of the cowling looks kind of attractive
> right now. :)
>
> Bob W.
>
> -- 
> http://www.bob-white.com
> N93BD - Rotary Powered BD-4 (first engine start 1/7/06)
> Custom Cables for your rotary installation -
> http://www.roblinphoto.com/shop/
>


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