Anonymous Cowar said:Matthew Thomas said:Does anyone know if there is any research that has found a link
between the wind noise experienced while riding and permanent
hearing damage?
Do you also ride motorbikes - or did a motorcyclist ask you? I was
bemused when I first saw your question, but there seem to be a few
web-pages suggesting motorcyclists might suffer hearing-loss from the
wind noise.
One of them also seemed to suggest that wind noise increased
exponentially with speed (100 dB at 30mph - seemed high to me; 115 at
60mph) - which suggests to me that most cyclists are likely to be quite
safe. Maybe someone here knows differently, though?
AC
Dear Matt and A.C.,
Street motorcycles are a different kettle of fish than bicycles because
the speeds are much higher and the exhaust noise is added. A typical
bicycle is going to roll at only about 15 to 25 mph, a sedate stroll
for a street motorcycle, and the only engine noise is the panting of
the rider.
Hearing loss from noise is the result of decibel level, or energy, but
this is not actaully a very good measure for this particular situation.
The trouble is that absolute sound energy is usually measured for sounds
at a reasonable distance--five feet away, within a room, inside a car.
This makes sense for normal sounds, but not for what we're calling wind
noise on a bicycle. There is practically no wind noise produced by a
bicycle, as anyone can prove by listening to a bicycle roll past.
The noise that we're talking about is the turbulence as our pointy ears
hit the wind stream at an angle--we can hear it, but no one else can.
It's an absolutely tiny, trivial noise (you'd have to be Dumbo to make
a noise audible to anyone else by turning your head in the wind), but
it's occurring right next to your ear drum. The huge leverage of
proximity is what magnifies the tiny noise of the breeze rustling past
your ear-lobes.
This is why bicycle helmets can make an audible difference, even though
they don't cover our ears. Things may sound different because the helmet
changes the air flow around your head--just as turning your head
slightly to one side or the other will change the noise.
As a rough guide, however, notice that you can easily talk to other
bicycle riders over this noise. It's no worse than standing on the deck
of a ferry boat, enjoying the breeze, and chatting with a friend.
But just as wind drag increases exponentially with speed, so will wind
noise right in a rider's ear increase as speed rises. This is one
reasons why motorcycle fairings are popular--they cut the wind speed and
reduce the noise. But most bicyclists don't reach 50 mph often enough to
worry about this.
The same is true of headphones on planes. The music may be playing, but
they still muffle some of the roar of the engines.
Carl Fogel
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