Frank Davis wrote:

Hi Paul,

In the sketch of the cross flow radiator (coflorad.gif) that was attached to
the referenced message, what is the air flow direction, right to the left, or
left to right?

Cheers, Frank

>From right to left. 

BTW It was discovered back in the early thirties
by Franklin that heat transfer was more efficient if the cold
air went over the coolest part of the air cooled engine first. The reason
for this is average temp difference is higher by about 15 to 20%.
See the chart below. That is also why I am having Ron build the radiator 
this way.

That is why most aircraft engines have the cooling air comes in on
the top of the cylinders and then flow down over the exhaust
side of the cylinders. Down draft cooling. This of course flies 
in the face of heat rising :-)

In our case with a rad under the engine and air coming in under the
rad we have the best of both worlds. Hot air rises and the cool side
of the rad gets cold air first.
 
Paul Lamar
 
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