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Thanks Tommy.
I'll work up a proceedure and guidelines and post it here and on my
website. Something I've been meaning to do for months now. Soon now, I
promise.
There is quite a bit more but here is the key part. Use an extra airspeed
indicator to measure the pressure at various places around the heat
exchangers, especially the 'front' side.
You can use a water manometer but this gets really messy and requires a lot
extrapolation / calculation. Use the ASI and things are a lot simpler.
Plumb the ASI to the aircraft static port (reference/static port on
instrument) and connect the pitot port to a tube that you can locate in
various places around the heat exchangers. Put a piece of porous material
(cloth, sponge, etc) around the end of the tube to ensure reading local
pressure unaffected by aircurrents.
Bottom line: you want to read about the same airspeed on this instrument as
the airspeed indicator on your panel when the probe is directly in front of
the rad. If it is way less than this, you have work to do on your
inlets/ducts.
Tracy
----- Original Message -----
From: "Tommy James" <twjames@healed.org>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Monday, August 04, 2003 5:43 PM
Subject: [FlyRotary] Re: Oshkosh Grumps
> Hi Tracy, Glad you are home safe!
> Please, give us all a 1-2-3 step procedure on measuring the pressures fore
> and aft of the rads.. I think Hank and I might need to do this..:-)
> Tommy<><
>
> TC wrote:
> Cooling is working really well now. Had a 25 minute ground taxi before
> departure and water temp was up to 205 when I started my takeoff roll.
Temp
> was already droping as I climbed out. After futzing with cooling systems
on
> the plane for almost 10 years now, I am convinced that the key factor is
> pressure recovery. If you are having cooling problems, measure the
pressure
> in front of the rad. If it is not a high percentage (at LEAST 60 - 70%)
of
> dynamic airspeed pressure, start working on your inlets and/or ducts.
Back
> side pressure should be fairly low too (mine is about 2" H2O) but front
side
> pressure is the 400 pound gorrilla in airplane cooling.
>
>
>
> >> Homepage: http://www.flyrotary.com/
> >> Archive: http://lancaironline.net/lists/flyrotary/List.html
>
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