I guess you're talking about interference patterns and such. All that stuff
is irrelevant. The noise coming from a pulse jet will only have a couple of
periodic components. The rest is a bunch of quasi-random, aperiodic noise
resulting from some extreme turbulence. While turbulence phenomena are
chaotic in nature and not truly random, you might as well treat them as
random for this case. You never get a periodic interference pattern setting
up.

"Regnirps" wrote in message
...
As for summing, there is nothing mysterious. If you put two engines near
each
other you will sum in some places and cancel in others, but the location
varies