So I worked on updating the web site.

Please read and comment.

http://www.rotaryeng.net/coax.html

Paul Lamar


You might want to fix the spelling error, "Super quit rotary powered
 Lockheed reconnaissance aircraft."

I'm pretty sure you meant "quiet" not "quit".

Other than that the page looks excellent.

Mark LaPierre

Your wright.

Paul Lamar



"It is just an long open 2.5 inch pipe with a lot of small holes in
it."

You want "It is just a long open 2.5 inch pipe with a lot of small
holes in it.”

Norm

Yes correct. Thanks Norm. I'll fix on it on the web site when I get
back.

Paul Lamar
It's significantly more complex than that. The drawings are available
for review (but not copying) at the archives of the Seattle Museum of
Flight. From the engine there is a piece of regular steel automotive
flex tubing (a J. C. Whitney part number is given) which transitions to
2.5" stainless.  The pipe starts out at 2.5" and has a plain perforated
section around which there is a resonator chamber tuned to one
particular operating frequency (referred to as the resonant silencer.)
From there it runs straight for five feet and then tapers over another
five feet of length from 2.5 to a 2.5x0.5 inch oval at the end (this is
called the dissipative silencer.) The holes are placed in individual
divots which are tilted 30 degrees into the flow of the pipe. The shroud
is lined with fiberglass batt held in place with chicken wire and there
is additional fiberglass on the inside of the fuselage.

David Josephson


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