Perry Mick wrote:

snips...

This is too big to go under the engine in a Long-Ez.  How about a second
smaller version for us guys with small airplanes.  14 wide by 18 long is
about all you can get in a Long.  I have two 14 x 16 x 1 rads.

Where are they mounted now Perry? Got any pictures?

No, will have to take some.

snips..

Sounds tough to do Perry. What is working for you now?
Skinny airplanes are always hard to install anything in :-)

What is working is two condenser cores from '83 RX-7s.  These are built
to handle high pressures, but don't work like normal radiators.  Each
has
four little tubes that wind back and forth accross the radiator.  I
think
those eight little tubes have less cross-sectional area than my tubing
connecting to them so they must be restrictive.  But the coolant gets to
spend more time in the rads than normal because there is only one path,
not several in parallel.  What does your theory say about something like
this?  It's been working for 90 hours now, but I think if I develop more
power from the engine they will no longer suffice.

--
Perry J. Mick
Mick Duckt N7XR
http://www.ductedfan.com

Even the auto manufactures have no overall unified mathematical theory
on cooling  :-) Too many variables. For all I know your ducted fan is 
pumping air through those rads like a hurricane. This could be a hint of
the over riding importance of proper ducting.
You could crawl under there there when the engine is running at max
static RPM and measure the air flow velociy going into the intake
with one of those new electronic digital windspeed meters. 

Paul Lamar
 
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