At half throttle on one side of my trawler and 50 feet away on the other side...my Honda 1000 it isn't even audible above normal ambient noises.
If you strain....and the wind dies, people stop talking, cars disappear from the road a 1/2 mile away....you might hear it if your hearing is good.
At 100 feet you would have to have complete silence and perfect hearing to hear it.
If on the same side where the sound reflects...yes...out to a 1/4 mile and you probably can hear it.
Again....standing there in fron t of it is annoying like a lot of sounds...try to mask it at all and it starts to dwindle fast.
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