Jerry Hey wrote:

Mike, Bill and Paul

I will provide for a fan should one be needed.  The beginning of the
NACA duct is 7' from the prop. I "hope" the prop wash will enter at
idling speeds.  The prop wash over the outlet doors should create low
pressure causing some air to be pulled through the inlet regardless
of whether or not it is gathering ram air.  A  800 cu in rad should
help out even with moderate air flow.  A LOT more air is available as
soon as taxiing begins, of course.  I am attaching a photo of a
"modern" Tailwind for those who do not know what one looks like. It
was designed in 1953 by Steve Wittman.  The design has been honed
ever since.   0-320 Tailwinds easily exceed 200 mph.    Jerry

I was unable to read that jpg. 
You will need that fan for sure Jerry.
Maybe two of them.

Paul Lamar
 
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