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The original Mayflowers motors put out a lot of noise. It was approximately 110 db. It required that the crew and passengers wear headphones or headsets to talk to each other. I believe Silent Joe II was to achieve 35 db at a particular frequency (125 Hz). The Robinson-Dadson curves were used as the standard. Whispering is about 30 db with normal conversation about 60 db. A motorcycle engine, for an engine comparison, is about 70 db.
