New Noise! audio clip

Wow, you sure got a lot of time on your hands.

Ron Hardin said:

I have a new bike noise. Putting the Nashbar Space Grips vertical,
having decided I wasn't going to put back the Sony bike radio under
them, I find that they whistle above about 20mph, which they did
not do when slanted forwards. (But if slanted forwards, the tend
to slip more forwards under the weight of a cateye light and eTrex
on each one, under road vibration.)

audio clip http://home.att.net/~rhhardinf/bike.wav (62kb)

There are two notes, both pretty much the same, varying between
690 and 760 Hz, one from each Space Grip.

I believe these are from van Karmen vortices, incidentally
http://www.visualsunlimited.com/browse/vu307/vu307371.html
though the photo shows it on a bit larger scale.

I don't know if I'll live with it as an interesting sort of deer
whistle and air speed indicator or not.

Recorded with a credit-card-sized IC recorder that I always carry
to save bird calls I don't recognize.

Nice try Ron.
It's actually a sample from one of Ted Nugent's earlier works.
"Journey to the Center of your Mind"

My bike sometimes made a similar noise until I switched from bottles to
cans for the ride to work. It's funny, but I don't seem to get as many
flats on the way home either.

Marcus

Ron Hardin said:

I have a new bike noise. Putting the Nashbar Space Grips vertical,
having decided I wasn't going to put back the Sony bike radio under
them, I find that they whistle above about 20mph, which they did
not do when slanted forwards. (But if slanted forwards, the tend
to slip more forwards under the weight of a cateye light and eTrex
on each one, under road vibration.)

audio clip http://home.att.net/~rhhardinf/bike.wav (62kb)

There are two notes, both pretty much the same, varying between
690 and 760 Hz, one from each Space Grip.

I believe these are from van Karmen vortices, incidentally
http://www.visualsunlimited.com/browse/vu307/vu307371.html
though the photo shows it on a bit larger scale.

I don't know if I'll live with it as an interesting sort of deer
whistle and air speed indicator or not.

Recorded with a credit-card-sized IC recorder that I always carry
to save bird calls I don't recognize.

Recorder on roadside, bike going past, shows the sound unhelpfully
propagates to the rear and not much to the front. No good for
deer, unless they're chasing you.

http://home.att.net/~rhhardinf/bike2.wav (132kb)

The bird at the end is a mourning dove.
--
Ron Hardin
[email hidden]

On the internet, nobody knows you're a jerk.

Ron Hardin said:

I have a new bike noise. Putting the Nashbar Space Grips vertical,
having decided I wasn't going to put back the Sony bike radio under
them, I find that they whistle above about 20mph, which they did
not do when slanted forwards. (But if slanted forwards, the tend
to slip more forwards under the weight of a cateye light and eTrex
on each one, under road vibration.)

audio clip http://home.att.net/~rhhardinf/bike.wav (62kb)

There are two notes, both pretty much the same, varying between
690 and 760 Hz, one from each Space Grip.

I believe these are from van Karmen vortices, incidentally
http://www.visualsunlimited.com/browse/vu307/vu307371.html
though the photo shows it on a bit larger scale.

I don't know if I'll live with it as an interesting sort of deer
whistle and air speed indicator or not.

Recorded with a credit-card-sized IC recorder that I always carry
to save bird calls I don't recognize.

Recorder on roadside, bike going past, shows the sound unhelpfully
propagates to the rear and not much to the front. No good for
deer, unless they're chasing you.

http://home.att.net/~rhhardinf/bike2.wav (132kb)

The bird at the end is a mourning dove.
--
Ron Hardin
[email hidden]

On the internet, nobody knows you're a jerk.

Ron Hardin said:

I have a new bike noise. Putting the Nashbar Space Grips vertical,
having decided I wasn't going to put back the Sony bike radio under
them, I find that they whistle above about 20mph, which they did
not do when slanted forwards. (But if slanted forwards, the tend
to slip more forwards under the weight of a cateye light and eTrex
on each one, under road vibration.)

audio clip http://home.att.net/~rhhardinf/bike.wav (62kb)

There are two notes, both pretty much the same, varying between
690 and 760 Hz, one from each Space Grip.

I believe these are from van Karmen vortices, incidentally
http://www.visualsunlimited.com/browse/vu307/vu307371.html
though the photo shows it on a bit larger scale.

I don't know if I'll live with it as an interesting sort of deer
whistle and air speed indicator or not.

I'm surprised someone hasn't tried using a pitot tube for measuring bike
speed. This would take into account the effect of headwinds :-)

Zog The Undeniable said:

Quoted message said:

I don't know if I'll live with it as an interesting sort of deer
whistle and air speed indicator or not.

I'm surprised someone hasn't tried using a pitot tube for measuring bike
speed. This would take into account the effect of headwinds :-)

I had an actual J-3 Piper Cub airspeed indicator on my bike as a kid, with necessary
pitot tube. In a great headwind, you could budge it off the peg.

Even in a Piper Cub, you can fly around with the thing on 0, so it's no
disparagement of my pedalling ability; though that effect is from a high angle of
attack.
--
Ron Hardin
[email hidden]

On the internet, nobody knows you're a jerk.

Ron Hardin said:

I had an actual J-3 Piper Cub airspeed indicator on my bike as a kid, with necessary
pitot tube. In a great headwind, you could budge it off the peg.

That was probably at the stage when I had bits of card taped to the
chainstay of my Raleigh Chopper to make "motorbike" noises!

Ron Hardin said:

I had an actual J-3 Piper Cub airspeed indicator on my bike as a kid, with necessary
pitot tube. In a great headwind, you could budge it off the peg.

That was probably at the stage when I had bits of card taped to the
chainstay of my Raleigh Chopper to make "motorbike" noises!

Zog The Undeniable said:

Ron Hardin said:

I had an actual J-3 Piper Cub airspeed indicator on my bike as a kid, with necessary
pitot tube. In a great headwind, you could budge it off the peg.

That was probably at the stage when I had bits of card taped to the
chainstay of my Raleigh Chopper to make "motorbike" noises!

I think it's more a physics experiment. Registering zero isn't exciting like
playing cards in the spokes.

If there were a handy airpseed gadget I'd add it to the bike today; in fact
the whirling vane kind and the pressure kind both, if possible. There's an
unanswered question about slower speeds in winter, whether it's higher air
density or caloric limits to effort.
--
Ron Hardin
[email hidden]

On the internet, nobody knows you're a jerk.

Ron Hardin said:

If there were a handy airpseed gadget I'd add it to the bike today; in fact
the whirling vane kind and the pressure kind both, if possible. There's an
unanswered question about slower speeds in winter, whether it's higher air
density or caloric limits to effort.
--

This might do the trick:

http://www.ultralightnews.ca/halls_airspeed/

Quoted message said:

That was probably at the stage when I had bits of card taped to the
chainstay of my Raleigh Chopper to make "motorbike" noises!

I preferred balloons myself. More bass.

(Sorry Z.T.U. : I clicked the wrong button.)

Ron Hardin said:

There's an
unanswered question about slower speeds in winter, whether it's higher air
density or caloric limits to effort.

And I always thought it was Christmas food. Not exactly caloric limits
- more the opposite ;-)

Zog The Undeniable said:

Ron Hardin said:

There's an
unanswered question about slower speeds in winter, whether it's higher air
density or caloric limits to effort.

And I always thought it was Christmas food. Not exactly caloric limits
- more the opposite ;-)

I think it's a caloric limit. The chief one is heating the air you breathe;
if you work harder, you breathe harder, and need more heating to heat that
breathed air. This is unstable, because heating requires breathing ultimately,
and the breathe-more heat-more cycle saturates just on its own. So you _have_
to let up on work to unsaturate that cycle.

You can work very hard briefly but not mile after mile, if it's super-cold.
--
Ron Hardin
[email hidden]

On the internet, nobody knows you're a jerk.