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

Rhino (in your hands)  is amazing.  I don't plan on building any
compound curve exhaust pipes,  But a nice curvy one going aft as you
have drawn will fit a lot of installations.   If I need to kick it
outboard,  away from the rad,  I can do it the same as the one on the
Tailwind and then add the curved part going back.  This project is
turning out to be kind of fun.    Jerry

If you were making exhaust system for choppers they would have you on
TV :)

I can make it do anything you want it to do. If it needs more
curvature
in one plain or the other no problem.

Paul,

Will this new curved design clear the mount for the KIS Crusier?
This looks a lot more interesting to me than the previous version
with the straight out the side exit.

Nice going Jerry.

Charlie Smith
KIS Cruiser 4021

The simple one with the side view only curved works fine Charlie.
You need to check the dimensions closely as it is a rather tight fit
between the motor mount tubes. What does you motor mount look like.
Schertz box beam or what. Do you have a picture of the mount?

Paul Lamar

I did not like the previous version either.  I make progress by
amassing mistakes until I finally get the idea.

I believe that we can  fit this system to just about any installation
except those that are running engine mount tubes to the front corner of
the block.   Those I don't know about.    It will definitely fit your S
beam engine mount.   Jerry

 
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