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 - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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