Bear in mind that blasting a stream of exhaust out perpendicular to
the
flight path is a drag hog.

Bill Schertz
KIS Cruiser # 4045

For some, the vertical pipe will be the only possibility but for most
the pipe can be sloped back.  In every case, there will be less drag
than created by  hanging a muffler under the fuselage.   In my case, I
plan to tack a little piece of half round ss to the leading edge of the
pipe where it is in the air stream, only an inch or so.    Jerry

Jerry,
Just a suggestion, you could use a piece of tube in the front of the section
seeing the wind ( rather than bending a piece of flat) and taper the sides
to a point to reduce the drag further - provided there is sufficient outlet
area.
George ( down under)

 
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