Where would be the highest speed /lowest pressure in Perry's duct?

Anyone able to run a caculation exercise on the merrits of using this
speed/pressure as a suction pump to suck air through the regular radiator?

The max speed in the duct should be quite a bit higher than the actual
aircraft speed. Would be great if you could use it! With a clean circular
augmenter/extractor one might get away without losses and a net gain with
the resulting smaller intake needed. If there is suction, a Naca intake
might have a place there too.
On a previous discussion it was mentioned, that this typ of intake was
designed for a suction typ airflow, wasn't it?
Well here we might be able to get that requirement!

Thomas J.

Thomas you need Rhino :) I am not sure I follow what you are proposing.

Paul Lamar

For my currently flying duct2, if the exit pressure (p4) is sea level
standard 14.70 psi, the pressure just aft of the fan plane (p3) is 14.51
psi and the pressure just in front of the fan plane (p2) is 14.35 psi.
This is all theoretical. Not very large "vacuums" there. This is with a
cruise speed of 115 knots and an airspeed of 156 knots in the fanplane.

But because of the location of my rad exit near the duct inlet, I get
the suction you are talking about through my rad, it eliminates any
ground cooling issues for me.

Perry

What is the pitch and width of your blades Perry? RPM?

Paul Lamar

There are 3 blades, an 8" diameter hub, blade chord at the root is 4",
pitch at the root 50", straight taper to 2.5" chord at the tip, pitch at
the tip 38". Fan diameter 37.5".

Thanks Perry. I'll try to figure out what angle of attack they
are running at unless you already know.

Paul Lamar
 
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