Received-SPF: none
 receiver=logan.com; client-ip=216.148.227.153; envelope-from=rlwhite@comcast.net
Date: Sun, 16 Jul 2006 15:44:32 -0600
From: Bob White <rlwhite@comcast.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Cooling non-test
Message-Id: <20060716154432.2e963546.rlwhite@comcast.net>
In-Reply-To: <list-1239115@logan.com>
References: <list-1239115@logan.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit

Hi Bill,

When I measured the flow out of the leaf blower it was very uneven
across the opening.  I felt that if I pressurised the box the flow up
the long snout would be more uniform.  I also tried it without the box
by taping the leaf blower straight into the cone (which is part of the
leaf blower when it's used to vacuum).  I couldn't measure the flow on
the backside of the radiators with that setup either.

Bob W.

On Sun, 16 Jul 2006 16:16:11 -0500
"Bill Schertz" <wschertz@comcast.net> wrote:

> 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/
> >
> 
> 
> --------------------------------------------------------------------------------
> 
> 
> > --
> > Homepage:  http://www.flyrotary.com/
> > Archive and UnSub:   http://mail.lancaironline.net/lists/flyrotary/
> > 
> 
> 
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:   http://mail.lancaironline.net/lists/flyrotary/


-- 
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/