Edward Klepeis wrote:

Dear Paul
      Here are the pic I said I would send you.
               Regards
                 ED
          techwelding@comcast.net

This is what a proper fish tail muffler should look like.
Wonderful job Ed. Are you going to bring it to S&F so we can display

it

in the rotary tent?

Paul Lamar

-Paul Carey wrote:

Paul

Are you telling me these fish tales actually reduce rotary engine

exhaust

noise? Is it the increase in tip surface area that does it?
As you know, we have 3 pipes out of our drag car, with Gonzo inline

mufflers

hidden under the car, but in the pits, and on the dyno it's still really
loud. Do you think three of these fish tales would reduce the noise?

Regards

PC

Paul Carey LAME, MC
Aero Management - aviation consultants.
www.aeromanagement.com.au
(08) 9371 5205  0418 959 892-

Yes they do. In fact you will get a bit more thrust out of them when

properly

oriented to the air stream. The Allison and Merlin exhaust stacks are
good examples from WW II. As I recall it was worth about 100 HP at 375

MPH.

Paul Lamar

As you may recall, a variation on this scheme was used in early noise
reduction efforts on turbojets. A flower shaped exit distrbutes the
shear area for better attenuation as the jet stream mixes with the air.
Vance

 
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