Paul I was wondering if you had a p-38 type intake and you're
radiators in back by firewall and some type of powered extraction nose
cone.
would this be something worth doing and has any body tried this(postive in
negtive out)?

clifton younger


I am not sure what you have in mind. Can you make a sketch?

Paul Lamar

I'm still at stick figures in the drawing department. what I mean is the
lower part of you're intake would be sealed as it makes the turn and goes
thur your radiators and in the engine compartment you could then have some
kind of turbine air extractor built in the nose cone
to power exhaust the air in the engine compartment.

clifton younger

I have no idea what you have in mind.

Paul Lamar


Cliff,

Are you talking about extracting energy from the airflow that goes through
the cooling system?
If so, then any type of turbine placed in that airstream will create more
restriction   and turbulence, (not a good thing) decreasing cooling
efficiency. Do you have Paul's book on cooling the rotary?

By spending a lot of time designing and testing, a well designed cooling
system will produce little or no cooling drag. That is a huge advantage for
water cooled engine aircraft.

Less drag equals less hp consumed for a given speed.

Doug in Japan


Clifton,   I may understand what you are asking.  I am trying to attach a
few JPEG images.  This was requested by someone building a canard pusher 3
rotor as an aid to ground cooling rather than relying on  a large  exit flap
or electric fans. It fits over Tracy's PSRU between the prop flange and the
prop. It is carbon fiber and uses turbine type blades to move the air. The
inlet is the large diameter end and it is ducted to the discharge side of
the wedge shaped difuser as shown in Pau'ls book on cooling.   There is a
shutter in the duct that closes and sends the cooling air through the cowl
flap while closing off the turbine inlet. With no air flow the HP required
by the turbine while flying  is expected to drop significantly.  The intent
is to optimize flow for 2500 RPM and have it bypassed to the cowl flap above
3000 RPM.   I just volunteered to draw the thing up for someone who doesn't
have 3D CAD software on another forum.  I don't think this has any
application to a tractor engine installation because you would be pushing
air backwards through the prop or at the very least into the spinner
backplate.  Anyway if this is what you are describing here is the sketch.

george grimes