> Bob,  the large exhaust opening is being eliminated.  However,   it is

possible to inspect the cool tube, even to pressurize it  to check for
leaks, if one wanted to do so.   The cabin heat thing was always an
afterthought. I like the idea but no one needs to follow my lead.  I
will put a temp probe on the cool tube to see how hot it gets.   If it
stays below 1600º it will NEVER burn out.     Jerry

Jerry,
Considering the shape (of the exhaust pipe) you have settled on, and I don't
know how far this will stick down from the cowl - you could play with the
shape to make it more aerodynamic for less drag, seeing your working with
flat plate.
Just a suggestion.
George (down under)

 
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