I'm sure that if Tracy were starting with a blank slate he might do his

cooling system differently. But, he's already racked up an impressive number
of hours with his evaporator cores. It would be a major task to go back to a
different design at this point.

I've had the benefit of watching this newsletter and I'll build a

cooling system the way that I think it ought to be done. Go ahead and slag
on Tracy's cooling system if you want, I'll see if I can build one that I
think will work better, but until I do, I'll sit on the sidelines and try to
learn from others.

If anyone is interested in what my cooling configuration will be, it's a

stock gen II oil cooler with a C&R radiator that's twice the size of the oil
cooler. They will be mounted next to each other underneath the engine, with
a scoop right underneath the spinner, which is(will be) 16" dia and 5 inches
forward of the stock placement of the prop hub. There will be a duct going
from the scoop to the heat exchangers. I hope to have the airplane done in
12-18 months.

I'm sure Tracy will be flying way before I am.

Brian Trubee

Brian,

excuse my ignorance, but I don't remember what bird you are building?

Did you do any calculations between your proposed cooling air ducting and
one proposed by Paul on this newsletter a couple of weeks ago?
The one with the rad under the cowl/fuselage and the possibility to move the
front end up/down to modify the frontal area?
To me this seemed the most elegant solution (..once faired in!!).
I am interested how Paul's system compares to yours for example in
aerodynamic drag.

Thomas J.

 
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