Finn Lassen wrote:

No marked improvement on the ground (idle to 3000 RPM).

Maybe a bit

better in the cockpit

while flying. I need to run with and without several

times.

Finn

Finn,

Mike Wills wrote:

  No improvement in comparison to what? Hope your not saying

that there

is

no improvement in comparison to a straight open pipe with no

muffler at

all.

Mike Wills

Jeff Spitzer wrote:

I'm really not an expert but I was afraid the pressure wave would

all come

out of the first row of holes with no particualr improvement.

Jeff Spitzer

Make them smaller and gradually larger as the wave travels down the
pipe?

Paul Lamar

        Perhaps the pressure wave cannot dissapate from the
first holes only. Must continue on until area of holes matches
the area of the pipe. Even then you have the speed of the
wave to allow for, cannot make a sharp turn to exit holes.
Virg

 
The AirCraft Rotary Engine NewsLetter.              Powered by Linux.

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