One way to take out the high frequency component of the exhaust is to

reflect the high frequency component back up the exhaust pipe. This can

be done by making a concentric

pipe muffler with a 90 degree cone at the end of the exhaust pipe the

internal pipe looks at this cone. The external concentric pipe takes the

exhaust out by reversing the direction of the gas flow and having the

gas exit from this pipe via a right angle tube. Does it work - yes - I

have built one and can demonstrate it. Basically all that is heard is

prop tip noise.

I have not measured back pressure so that I do not know if any

horsepower is lost. But it is sure quiet.

Chris Smale

Give me a couple of dimensions here Chris and I will do a 3D.

What is the diameter of the internal pipe?

External pipe diameter?

BTW here are some pictures of Chris's airplane.

Paul Lamar

Push-pull Twin Canard... Now, THAT'S interesting!

What's the cruise speed? Vne? Fuel flow? Climb? etcetcetc. Please :)

Cheers,

Petri

Paul, Could you apply the same organ pipe tuning to this to improve  exhaust scavanging the same way that you do the P-port intake.

The above message went tripple space when I clicked reply, anybody know
why.


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george grimes

Are you using Sea Monkey?

Are you using an anti virus program?

Paul Lamar