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Air Speed Indication

Started by Bart Bailey · · Last activity · 14 posts · 356 views

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Road Cycling
Published
9 October 2006
Last activity
10 October 2006
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Bart Bailey
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  1. Because it seem all rides are both uphill and against the wind,
    there have been various wind speed indicators available for cyclists.
    I bought a Davis Instruments WindScribe http://tinyurl.com/l3wpe
    for just that purpose and mentioned in a response to another post my
    curiosity about the weather worthiness of that unit.
    The total absence of responses prompted me to email tech support at the
    company from whom I got a prompt reply reassuring me that not only is
    the unit weather proof, it will even float.
    I'm guessing that if during a rain and water droplets accumulate within
    the ultrasonic sensing tube, you might have to shake or blow it out to
    regain measurement accuracy.

    --

    Bart

  2. In Message-ID:<[email hidden]> posted on Mon, 09 Oct
    2006 19:54:02 GMT, Bart Bailey wrote: Begin

    Quoted message said:

    Because it seem all rides are both uphill and against the wind,
    there have been various wind speed indicators available for cyclists.
    I bought a Davis Instruments WindScribe http://tinyurl.com/l3wpe
    for just that purpose and mentioned in a response to another post my
    curiosity about the weather worthiness of that unit.
    The total absence of responses prompted me to email tech support at the
    company from whom I got a prompt reply reassuring me that not only is
    the unit weather proof, it will even float.
    I'm guessing that if during a rain and water droplets accumulate within
    the ultrasonic sensing tube, you might have to shake or blow it out to
    regain measurement accuracy.

    Piggy backing myself:

    I just got another email from a different company representative
    regarding the WindScribe stating:
    "If it gets a few drops on it that is fine, but if it gets soaked that
    is not good. It is not Water Proof."
    I don't plan to be out in a soaking rain, at least not here in San
    Diego, but it's something to think about for riders in other areas.

    --

    Bart

  3. Bart Bailey said:

    In Message-ID:<[email hidden]> posted on Mon, 09 Oct
    2006 19:54:02 GMT, Bart Bailey wrote: Begin

    Quoted message said:

    Because it seem all rides are both uphill and against the wind,
    there have been various wind speed indicators available for cyclists.
    I bought a Davis Instruments WindScribe http://tinyurl.com/l3wpe
    for just that purpose and mentioned in a response to another post my
    curiosity about the weather worthiness of that unit.
    The total absence of responses prompted me to email tech support at the
    company from whom I got a prompt reply reassuring me that not only is
    the unit weather proof, it will even float.
    I'm guessing that if during a rain and water droplets accumulate within
    the ultrasonic sensing tube, you might have to shake or blow it out to
    regain measurement accuracy.

    Piggy backing myself:

    I just got another email from a different company representative
    regarding the WindScribe stating:
    "If it gets a few drops on it that is fine, but if it gets soaked that
    is not good. It is not Water Proof."
    I don't plan to be out in a soaking rain, at least not here in San
    Diego, but it's something to think about for riders in other areas.

    --

    Bart

    If you want a really good all weather instrument, try a Kestrel.
    Waterproof and floats as the Nielsen-Kellerman folks originally made
    these for boating. Google Kestrel Wind Meters.

    Chip F.

  4. In Message-ID:<[email hidden]>
    posted on 9 Oct 2006 13:28:36 -0700, chipsoars wrote: Begin

    Quoted message said:


    Bart Bailey said:

    In Message-ID:<[email hidden]> posted on Mon, 09 Oct
    2006 19:54:02 GMT, Bart Bailey wrote: Begin

    Quoted message said:

    Because it seem all rides are both uphill and against the wind,
    there have been various wind speed indicators available for cyclists.
    I bought a Davis Instruments WindScribe http://tinyurl.com/l3wpe
    for just that purpose and mentioned in a response to another post my
    curiosity about the weather worthiness of that unit.
    The total absence of responses prompted me to email tech support at the
    company from whom I got a prompt reply reassuring me that not only is
    the unit weather proof, it will even float.
    I'm guessing that if during a rain and water droplets accumulate within
    the ultrasonic sensing tube, you might have to shake or blow it out to
    regain measurement accuracy.

    Piggy backing myself:

    I just got another email from a different company representative
    regarding the WindScribe stating:
    "If it gets a few drops on it that is fine, but if it gets soaked that
    is not good. It is not Water Proof."
    I don't plan to be out in a soaking rain, at least not here in San
    Diego, but it's something to think about for riders in other areas.

    --

    Bart

    If you want a really good all weather instrument, try a Kestrel.
    Waterproof and floats as the Nielsen-Kellerman folks originally made
    these for boating. Google Kestrel Wind Meters.

    Chip F.

    I had one once, was a hand held,
    is there a way to affix one of them to the handlebars
    to allow both hands on the grips and still see the readout LCD?

    --

    Bart

  5. Bart Bailey said:

    I had one once, was a hand held,
    is there a way to affix one of them to the handlebars
    to allow both hands on the grips and still see the readout LCD?

    The Kestrel unit I have comes with a base that has a standard nut for
    attaching it to a tripod. I use it with a standard tripod to set up a
    miniature weather station at study sites. There are plenty of handlebar
    mounts that have a standard tripod mount.

    That being said, I doubt I would ever mount it there. The instrument
    would stick up 8 inches or so. Below is a link to a Kestrel in its
    mount attached to a mini tripod.
    http://www.ambientweather.com/kepotr.html

    Just imagine that standing up from your handlebar! Perhaps if you had a
    secondary accessory bar that provided space further away from the
    handlebar, it would be tolerable. For me, the additional data just
    isn't worth the additional hassle.

    -Buck

  6. In Message-ID:<[email hidden]>
    posted on 9 Oct 2006 13:50:39 -0700, Buck wrote: Begin

    Quoted message said:

    Just imagine that standing up from your handlebar! Perhaps if you had a
    secondary accessory bar that provided space further away from the
    handlebar, it would be tolerable. For me, the additional data just
    isn't worth the additional hassle.

    I initially got the WindScribe because its readout is topside and the
    whole thing is low profile, the weatherproofing question came up later
    and hasn't yet been an issue. It's like the terrestrial (wheel sensor)
    speedometer/computer, just another curiosity to distract attention from
    the road, for an old pleasure class geezer, who always wears his helmet.

    --

    Bart

  7. "Bart Bailey" <[email hidden]> wrote in message
    news:[email hidden]...

    Quoted message said:

    In Message-ID:<[email hidden]>
    posted on 9 Oct 2006 13:50:39 -0700, Buck wrote: Begin

    Quoted message said:

    Just imagine that standing up from your handlebar! Perhaps if you had a
    secondary accessory bar that provided space further away from the
    handlebar, it would be tolerable. For me, the additional data just
    isn't worth the additional hassle.

    I initially got the WindScribe because its readout is topside and the
    whole thing is low profile, the weatherproofing question came up later
    and hasn't yet been an issue. It's like the terrestrial (wheel sensor)
    speedometer/computer, just another curiosity to distract attention from
    the road, for an old pleasure class geezer, who always wears his helmet.

    If pleasure is your goal why wear a helmet? Oh, yeah, always carry a
    plastic baggie with you, if it starts to rain put the baggie on the
    distraction.

    Greg

  8. In Message-ID:<[email hidden]> posted on Mon, 9 Oct
    2006 15:42:11 -0700, G.T. wrote: Begin

    Quoted message said:

    If pleasure is your goal why wear a helmet?

    So I might survive some unexpected event
    to reap more pleasure from the future.
    It's one of those plastic covered styrofoam jobs
    that weighs very little, hardly know I have it on.

    --

    Bart


  9. Quoted message said:
    Quoted message said:


    Chip F.

    I had one once, was a hand held,
    is there a way to affix one of them to the handlebars
    to allow both hands on the grips and still see the readout LCD?

    --

    Bart

    As an interim measure why dont you just try taping it to the handle
    bars to see what results you get. However I am skeptical that it will
    measure air velocity (the vector sum of your ground speed and wind
    speed) correctly. This is due to flow stagnation as the air slows down
    in front of an object. You would really need to attach something like a
    long stick to your bike and put the wind measuring device on the end of
    that.

  10. "Bart Bailey" <[email hidden]> wrote in message
    news:[email hidden]...

    Quoted message said:

    In Message-ID:<[email hidden]> posted on Mon, 9 Oct
    2006 15:42:11 -0700, G.T. wrote: Begin

    Quoted message said:

    If pleasure is your goal why wear a helmet?

    So I might survive some unexpected event
    to reap more pleasure from the future.
    It's one of those plastic covered styrofoam jobs
    that weighs very little, hardly know I have it on.

    It's a Magic Foam Hat(TM). Frank and the Frankazoids will bash you. No
    pleasure for you!!!

  11. In Message-ID:<[email hidden]>
    posted on Tue, 10 Oct 2006 14:46:10 GMT, Ludmila Borgschatz-Thudpucker,
    MD wrote: Begin

    Quoted message said:


    "Bart Bailey" <[email hidden]> wrote in message
    news:[email hidden]...

    Quoted message said:

    In Message-ID:<[email hidden]> posted on Mon, 9 Oct
    2006 15:42:11 -0700, G.T. wrote: Begin

    Quoted message said:

    If pleasure is your goal why wear a helmet?

    So I might survive some unexpected event
    to reap more pleasure from the future.
    It's one of those plastic covered styrofoam jobs
    that weighs very little, hardly know I have it on.

    It's a Magic Foam Hat(TM). Frank and the Frankazoids will bash you. No
    pleasure for you!!!

    Even still, with that ethereal shell,
    they'll have to bash a bit harder than without it. ;-)

    --

    Bart

  12. In Message-ID:<[email hidden]>
    posted on 10 Oct 2006 02:30:33 -0700, Rik O'Shea wrote: Begin

    Quoted message said:


    Quoted message said:
    Quoted message said:


    Chip F.

    I had one once, was a hand held,
    is there a way to affix one of them to the handlebars
    to allow both hands on the grips and still see the readout LCD?

    --

    Bart

    As an interim measure why dont you just try taping it to the handle
    bars to see what results you get. However I am skeptical that it will
    measure air velocity (the vector sum of your ground speed and wind
    speed) correctly. This is due to flow stagnation as the air slows down
    in front of an object. You would really need to attach something like a
    long stick to your bike and put the wind measuring device on the end of
    that.

    As my riding is more of a pleasure quest than a scientific endeavor,
    there's really no need for such elaborate contraptions.
    Looking at the numbers is satisfying enough,
    with the difference between the two speed indicators
    (ground & air) confirming the apparent extra effort required.

    --

    Bart

  13. You would really need to attach something like a

    Quoted message said:
    Quoted message said:

    long stick to your bike and put the wind measuring device on the end of
    that.

    As my riding is more of a pleasure quest than a scientific endeavor,
    there's really no need for such elaborate contraptions.
    Looking at the numbers is satisfying enough,
    with the difference between the two speed indicators
    (ground & air) confirming the apparent extra effort required.

    The only value I have seen for Airspeed indication of a bicycle is I
    have noticed horseflies can briefly sprint to about 8 MPH. Below
    this, they can catch and bite you.
    For weight-saving, perhaps a little flap-operated microswitch set to
    a specific angle of attack could make a tiny piezo Stall Warning
    Buzzer go off at 7 MPH...

  14. In Message-ID:<[email hidden]> posted on
    Tue, 10 Oct 2006 15:14:55 -0400, Grunty Goragan wrote: Begin

    Quoted message said:

    You would really need to attach something like a

    Quoted message said:
    Quoted message said:

    long stick to your bike and put the wind measuring device on the end of
    that.

    As my riding is more of a pleasure quest than a scientific endeavor,
    there's really no need for such elaborate contraptions.
    Looking at the numbers is satisfying enough,
    with the difference between the two speed indicators
    (ground & air) confirming the apparent extra effort required.

    The only value I have seen for Airspeed indication of a bicycle is I
    have noticed horseflies can briefly sprint to about 8 MPH. Below
    this, they can catch and bite you.
    For weight-saving, perhaps a little flap-operated microswitch set to
    a specific angle of attack could make a tiny piezo Stall Warning
    Buzzer go off at 7 MPH...

    There's also a GPSMAP 76CS giving a third number to the mix of speed
    approximations, none of which are absolutely accurate.
    The wheel rotation counter is probably the most accurate,
    but the internal reference clock could be off as well as the wheel
    circumference after road warming.
    Like I tried to say up front, my riding is for pleasure, and a few tech
    gadgets only serve to enhance the novelty of that experience for an old
    retired scientist.

    --

    Bart

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