Paul,
an errant thought popped into my head the other day regarding exhaust systems. It probably has no practical application, but I was wondering if you have ever heard of this sort of approach to noise attenuation.

Since exhaust noise is essentially a series of high and low pressure cycles, could an exhaust system be tuned such that the exhaust were split and then re-combined so that the high and low pressure waves would then cancel each other out. This might be accomplished by using a splitter on the exhaust or using the output on each rotor and then varing the length of one of the runners to get the correct tuning for a canceling effect.  Think of a slide trombone arrangement for adjusting the length of a runner.

Anyway, just a thought. Wondering if anything like this has ever been tried.

Brian Trubee

That is essentially what we have now as one rotor is 180 degrees out of phase with
the other. It is tuned for 6000 RPM with 32 inch pipes.

Paul Lamar
 
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