Bill Jepson wrote:

Man what a typical bonehead mistake! Yes 150% Paul, I will be red faced
for several
days over that one.  It was late when I started but I should have come
to my senses
the next day.  I will see what I can do to fit in 800 cu inches! I did
think of reversing
the radiatiors, blowing OUT, but didn't like the looks of it. Not
rational but still true.
 I will move the radiators forward, in a long axis along the fuselage
and see what my
picture looks like. Bill Jepson

The key to stuffing everything under the cowl is to lose half
the ducting by mounting the rads along side the skin and use
the air flowing by on the outside of the skin as the exit duct :)

Things are boiling down to several configurations.

A: Air blows over the engine and through the rad into
an exit duct. Power Sport RV6, Dave Atkins RV6 and Tom Parkes Lancair. 
Not working too good. Although Dave's probably works the best
of the three as the rad is horizontal under the engine and the
exit duct is almost large enough. The other two have the rad
mounted more or less vertically behind the engine.

B. Air blows through the rad and over the engine eventually finding
it way out an exit slot. Most people. Chuck, Ed, Tracy, Ken, Finn etc. etc. etc.
Not too bad. Almost works.

C. Air enters a sealed duct, goes through the rad and exits directly
outside. Perry and Ted Nickel. Works great. Perry and Ted both with  
very small rads and are not complaining about water cooling. Perry still
has an oil cooling problem we think but we are not sure.

Here is a picture of Ted's set up with cowl flap.

Paul Lamar
 
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