Finn Lassen wrote:

Please describe the inside. Is the inner pipe capped and full of holes?

Finn

Mike Wills wrote:

Finn,

  The inner pipe is pinched down at the end but not fully closed. It leaves
a slot at the end which is about 1/2" X 2 1/4". I was originally going to
cap it but thought that might be too restrictive. At this point I'm willing
to put up with a little excess noise in order to gain some power. The pipe
is also drilled full of 5/16" holes. All the holes were angled to
"encourage" exhaust flow into the outer pipe. Probably a total waste of
time but seemed like the thing to do at the time.

  The inner pipe is 1 3/4" OD. The outer pipe is 2 1/2" OD. All of the pipe
is .062" wall 321 stainless. I'm hoping that the thick wall will have
sufficient durability over time. It hasnt run yet so I have no idea how
well it will work or how loud it will be. If it proves to be effective and
durable I'm sure it could be lightened up quite a bit. I had to sleeve the
pipes at the ports to match up to the 2" holes in the RB flange. If I had
it to do over I would make a flange instead of using the RB piece.

  How is your flight testing coming along?

Mike Wills

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