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

Yes,  side view.  I want to have a curved version that follows the same
path  roughly as the mitered version.  I want to keep the 4 x 1.75
section constant through out.  No round parts.      If this is a lot of
trouble,  don't bother. I can lay it out in pencil..  I just don't know
how to get the computer to do it.    Jerry

Something like this? The side view looks distorted but trust me... it is
indeed constant area.

Paul Lamar

Here is a version curved in both front view AND side view along with the flats.
If you have not figured it out yet Rhino is amazing :) I could never in a million
years draw this with a pencil. :)

Paul Lamar
 
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