Quoted post said:Originally posted by Anonymous Cowar
BMatthew 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 [/B]
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