Paul, here are few pictures from my new muffler construction. The
  flange has two stubs with slip joints 0.065 SS that are pulled
  together with strong springs (not shown). The perforated tube is
  welded only on one side to the can. The other side fits into a slip
  socket welded to the lid, so it is allowed to float. Sofar works
  very well , but I need more time to see how it will hold?

  Bulent.

  I assume that is 321 SS. Nice workmanship.
  I hate to be the bearer of bad news but the perforated tube
  will run white hot, melt and eventually puke it self out of the
  can and out the through the prop. Tom Jordon had something like that
  on a Limo EZ. One could stand behind the prop with the engine
  at full chat and look down the exhaust pipe. It was like
  looking at a very bright light bulb in there :)

  Try to get some sort of air cooling tube down the center.
  I'll send some 3D's shortly.

  Also put some sort of safety strap on the whole muffler
  so if worse comes to worse the whole muffler won't go through
  the prop taking out a blade.

  ***********************************************

  Here are some pictures and 3D's. Tom changed it to the 8 and
  11 pics but I don't know the status on that config.
  The 45 degree joint does not look like it will work for
  long. What is needed there is a four inch center line
  radius 321 SS 45 degree bend instead.

  The Bill Jepson/Ed Klepeis muff. needs a a cold air tube from the
  front opening as relatively cool exhaust gases flow out the front
  cooling tube (pusher) at idle. Once the airplane is moving air
  will flow into the cooling tube if it is connected to a ram air
  source and it will work fine. The last dwg seems to be the
  overall best way of doing the cooling tube trick as you don't
  have to worry about exhaust gases exiting at idle.

  I think you were off the list when all this happened.

  Paul Lamar ...No rotor no motor.

Has Ed run his muffler yet (or one like it)? Is it pretty effective?
The cooling tube seems like a very clever idea.

Thanks,

Matt-

We ran it on a test stand. Not in an airplane yet
as far as I know.

Paul Lamar
Paul,
I'd still like to see the original muffler run WITH the tail pipe as
that is integral to the design function. I don't believe you would have
much idle backflow at all that way.
Bill Jepson

We ran it at Tracy's place on his test stand and I could
feel hot air coming out the front hole with my hand.