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Pulse jet active sound attentuation
In an earlier post I read somewhere that the pulse jet is a device
that converts fuel into noise. Someone else had suggested firing 2 engines 180 degrees out of phase with each other to cancel the sound. If the 2 engines were stacked one over the other, then you might actually be able to cancel a lot of the sound at least in a circle around the aircraft in the plane of the earths surface. Below the aircraft it would be just as loud but twice the frequency, but standing on the ramp 50 yards from the aircraft, it might actually be made to cancel somewhat. What do you guys think? |
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