Quoting Removed, click Modern View to seeI have read about electronic mufflers in the experimental stage at least, but know of no production. Even with a perfect muffler, the single cylinder engines still would not be real quiet, as the fins around the cylinders & all attached parts are vibrating like a speaker cone & sending out a lot of sound pressure waves. I remember the big change from air cooled to water jacketed engines in Porsche, Harley & others & the fin/other vibrations were found to be the source of much of the noise. My Miller 2E was/is stupid noisy, so I added a Corolla muffler ahead of the Miller/Tecumseh muffler & yes the exhaust noise went down, but all that 'other' noise is still terrible. A lot of shaking going on.
On the main topic here, concerning adding sources........it is far more complex that adding the dB ratings. Phase, reflections, distance between machines vs frequency (complex of frequencies), distance from each to observer, and on & on. Interesting discussion , but not many absolutes other than maybe decibel = 10log2 = 3dB. Then complicate that with the complex human who does not perceive that doubling of power as twice as loud. What is the meaning of life. :roll:
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Today's Featured Article - Self-Starting Tractor - McCormick 10-20 - by Francis J. Robinson. I remember it very clearly even though it was almost 50 years ago and I was only about seven years old. My Dad had purchased a new Ford-Ferguson tractor and basic set of implements when he started farming just about the beginning of W.W.II. It was considered a pretty nice outfit for their 70 acre central Indiana grain and livestock farm. Dad spent several years during the war testing aircraft engines at Allison Engineering in Indianapolis working seven days a week on a twelve hour night sh
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