"Jay" wrote in message
m...
The spectrum of the sound from the engine does indeed have several
strong harmonics that rise up from a random noise floor. I think
you'd be able to cancel the periodic components of the noise leaving
the random part behind. If I had to guess, you'd get rid of the buzz
and be left with the roar. So with cancelation it might be similar to
a jet turbine in sound.

Regards

p.s. As far as synchronization, if I understand correctly, most of the
simple forms of these motors are started with a spark, but then carry
on self sustained operation at the natural frequency of the pipe. You
could however use a spark to ignite the charge slightly early and thus
force synchronization.

Okay, already! That's enough, "I suppose" and "I think".

Build something and report back next Thursday. Documentation to follow
within five days. Oral boards will convene at their convenience no less than
two weeks after the thesis is finalized and submitted.

Warning - the penalty for failure is severe!

Miss Twyla Geeter.