A/C refrigeration coils (cores as most people say) are just that, coils of
tubing arranged in a serpentine pattern.
 > Looking at one you can see that the flow is through a single tube from

top,

 or in some cases from the bottom, but in a radiator the
 > flow is from a header tank on the end (or top) through all the tubes
simultaneously, (existing, occurring, or done at the same general
 > time or at the same moment.).
 > consequently, the flow rate through a radiator is higher by far than
through an evaporator coil.

The large GM Harrison division cores look identical to the Harrison radiators
in the Corvette and V6 Pontiac Fiero. I have used them (the cores) for water
and oil radiators to great effect. No problem in 30 years. The (tubes)
between the tanks look like flattened waffles with the tubing shapes laid one
on another in a 45 degree pattern. This, I would guess, if for maximum
turbulence in the coolant, be it R-12 or water. The thickness and tight tube
spacing make it a challenge to get air through them, so ducting and sealing
the ducting to the core is more important. Another nice feature is they can
take over 200 PSI without a problem. They are cheap and available worldwide.
There are several aircraft performing well with just two cores for all of the
water cooling load.  Lynn E Hanover

I would not call them performing well. Tracy must back off when
running side by side with a fast Lyc full chat. What we are trying to
do here is cool the rotary to the point we can surpass the speed
of your typical air-cooled aircraft engine. So far we have
been unable to do that. There still is lots of  prize money in the
Everett Hatch Memorial Fund for anyone entering a rotary powered 
airplane in a cross country race averaging more than 200 MPH.
So far in four years no takers. I am thinking of uping the ante. 
Come on folks. I know we can do it. After all rotaries dominate 
car racing.

Paul Lamar
 
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