Jerry Hey wrote:

Paul, in the attached drawing, it is clear that if I stick with
straight line joinery with miters, exhaust sections running at angles
will lose capacity.  I believe the solution is to use curves instead of
corners.  Unfortunately, in my hands, drawing a curved line in cad is
more difficult that cutting one out of stainless steel.   Could  you
model the pipe shape for me and send as an Iges file. Also at the top,
near the muffler,  I will need to put in a slip connection, so the need
there is  need for a short straight section.  The exhaust pipe in
question leaves the muffler at 45 degrees and continues for 10 inches
and then in turn down for 10 more inches. The section is 4 x 1.75
inches.   This is a real system that I will be building.  Thanks,  Jerry

Jerry Hey
j-winddesigns@thegrid.net

Is this a side view Jerry? If it were a front view the top part would be
round.

Paul Lamar
 
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