He’s running 275hp for takeoff with a
rad Core that is 16 X 8.75 X 3. So in other words he is
running more hp than a non turbo p-port rotary (which is
what I’ll be using) and using a smaller volume core than you
have recommended to do it. Not to mention 50% thicker.
From what I can tell, his approach is a very refined system
vs your brute force approach. Not to say the brute force
approach is a bad idea when dealing with builders who’s
setup will fail otherwise due to their inexperience and lack
of attention to detail. And I also recognize that you do
show methods of making a more refined system. Also your
system seems to be aimed more at installations to retain the
system completely under the cowl of aircraft designed for an
air cooled engine as opposed to hanging something out in the
breeze the way he did.
In his system the air gets a straight
shot through the whole system from intake to exhaust with no
major turns to kill the momentum. Most of the installations
illustrated in your book show obliquely mounted rads where
the air has to make a 90 deg turn to go into the core (good
for increased turbulence and heat transfer but bad for drag)
and another 90 turn going back into the slipstream. He also
measures his inlet and exhaust pressures which I have not
seen that you do. I have seen your manometer setup on each
face of the radiator but nothing in the intake and exhaust
so that pressure recovery may be adequately gauged.
So I’m interested to hear what you have
to say on the matter.
Reread the section about diffusers in the book. Of course we
measured the back pressure.
All the pressure measured are relative to the back pressure.
Paul Lamar
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