Bill, here is my suggestion for the slip joint if you are worried about
differential thermal expansion causing the joint between the two exhaust

pipes

and muffler to crack. I incorporated Jeff's suggestion on the down pipe
position to eliminate the possibility of a vortex choking the outlet.
A side cowl exit is shown. I will also redo the drawing of the tuned
version of this muffler.

Paul Lamar

 George Lendich wrote:

Paul,
So what's in the guts of that muffler, I though the tangential muffler had
rows of welded
flat to make a kind of square tube bent in a circle. One tube for the front
and one for the back
exhaust. Am I worng here !?
George (down under)

Nothing inside George. Anything you put inside is likely to burn up
as it does not get any cooling at all.

Paul Lamar

Paul.......I think George is confusing the TUNED tang.
muffler with the UN-TUNED. Please clarify the
differences for there might be other subscribers
scratching their heads like I was in the beginning :-)

                                     Butch Diaz Sr.

A tuned muffler has two pipes 32 inches long for 6000 RPM.
These pipes are wrapped around in a circle on the outside of a 5 to 6 inch
diameter can which is the actual muffler part.

An untuned muffler has two straight pipes. These two pipes are only about 
5 inches long and they enter the can on a tangent.

Paul Lamar
 
The AirCraft Rotary Engine NewsLetter.              Powered by Linux.

http://home.earthlink.net/~rotaryeng/            http://www.linux.org