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How fast will flies fly?

Started by DaveB · · Last activity · 8 posts · 1,021 views

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Australia and New Zealand
Published
30 November 2007
Last activity
30 November 2007
Original author
DaveB
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8
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  1. The weather is heating up and the flies are out which really annoy the
    hell out of me on long climbs. On these long climbs I've had plenty of
    time to come up with a theory.

    My theory is that (all brontosauruses are thin at one end ...sorry
    couldn't resist) flies are only prepared to fly at 13kmh to land on me.
    If I'm going 14kmh I'm not worthy of chasing and they leave me alone. Of
    course that only applies if there's no wind. Anyone else noticed this?
    How about a measurement to identify how stinky you are, eg. so stinky
    flies will still follow you at 17kmh 😉

    DaveB

  2. DaveB said:

    The weather is heating up and the flies are out which really annoy the
    hell out of me on long climbs. On these long climbs I've had plenty of
    time to come up with a theory.

    My theory is that (all brontosauruses are thin at one end ...sorry
    couldn't resist) flies are only prepared to fly at 13kmh to land on me.
    If I'm going 14kmh I'm not worthy of chasing and they leave me alone. Of
    course that only applies if there's no wind. Anyone else noticed this?
    How about a measurement to identify how stinky you are, eg. so stinky
    flies will still follow you at 17kmh 😉

    DaveB

    Riding behind another rider on Beach rode a few weeks back, between him and me was a fly spoiling my slipstream. We would have been doing 30 - 35 km/h. Was an interesting sight watching a fly hovering between the both of us.

  3. "DaveB" <[email hidden]> wrote in message
    news:[email hidden]...

    Quoted message said:

    The weather is heating up and the flies are out which really annoy the
    hell out of me on long climbs. On these long climbs I've had plenty of
    time to come up with a theory.

    My theory is that (all brontosauruses are thin at one end ...sorry
    couldn't resist) flies are only prepared to fly at 13kmh to land on me. If
    I'm going 14kmh I'm not worthy of chasing and they leave me alone. Of
    course that only applies if there's no wind. Anyone else noticed this? How
    about a measurement to identify how stinky you are, eg. so stinky flies
    will still follow you at 17kmh 😉

    DaveB

    Some interesting stuff here about the aussie bush fly and others.

    http://www.viacorp.com/flybook/fulltext.html

    "Wind speed. Another surprising one: strong winds don't make bush flies less
    pesky. They bother you almost as much on a windy day as on a still one.
    Winds speeds of 36 km/hr and more were common in one set of experiments, but
    it didn't keep the flies grounded -- or off people. But note this: though
    bush flies take to the air on a windy day, they get blown downwind. Relative
    to the air, they fly pretty slowly (about 8 km/hr, top speed)."

  4. Boostland said:

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

    Quoted message said:

    The weather is heating up and the flies are out which really annoy the
    hell out of me on long climbs. On these long climbs I've had plenty of
    time to come up with a theory.

    My theory is that (all brontosauruses are thin at one end ...sorry
    couldn't resist) flies are only prepared to fly at 13kmh to land on me. If
    I'm going 14kmh I'm not worthy of chasing and they leave me alone. Of
    course that only applies if there's no wind. Anyone else noticed this? How
    about a measurement to identify how stinky you are, eg. so stinky flies
    will still follow you at 17kmh 😉

    DaveB

    Some interesting stuff here about the aussie bush fly and others.

    http://www.viacorp.com/flybook/fulltext.html

    "Wind speed. Another surprising one: strong winds don't make bush flies less
    pesky. They bother you almost as much on a windy day as on a still one.
    Winds speeds of 36 km/hr and more were common in one set of experiments, but
    it didn't keep the flies grounded -- or off people. But note this: though
    bush flies take to the air on a windy day, they get blown downwind. Relative
    to the air, they fly pretty slowly (about 8 km/hr, top speed)."


    Fly Speed (assuming no strong wind from any direction) is as above, 17
    k/mh or thereabouts. However, as is well known, they will hang onto your
    back whilst moving and then swarm as soon as you slow down or stop.
    Short of spraying your shirt and knicks with Aerogard I don't see
    there's much you can do about it.
    Cheers,
    Ray

  5. On 2007-11-30, ray (aka Bruce)
    was almost, but not quite, entirely unlike tea:

    Quoted message said:

    Fly Speed (assuming no strong wind from any direction) is as above, 17
    k/mh or thereabouts. However, as is well known, they will hang onto your
    back whilst moving and then swarm as soon as you slow down or stop.
    Short of spraying your shirt and knicks with Aerogard I don't see
    there's much you can do about it.
    Cheers,

    Eat more kangaroo.

    http://www.smh.com.au/news/letters/altruism-is-the-best-medicine-for-doctors/2007/11/23/1195753299355.html?page=fullpage

    As you can see, I write letters to the editor about really important
    issues facing the nation, on election day.

    --
    TimC
    I repeat myself when under stress. I repeat myself when under
    stress. I repeat myself when under stress. I repeat myself when
    under stress. I repeat myself when under stress. I repeat myself
    when under stress. I repeat myself when under stress. I repeat


  6. Quoted message said:
    Quoted message said:


    Fly Speed (assuming no strong wind from any direction) is as above, 17
    k/mh or thereabouts. However, as is well known, they will hang onto your
    back whilst moving and then swarm as soon as you slow down or stop.
    Short of spraying your shirt and knicks with Aerogard I don't see
    there's much you can do about it.
    Cheers,
    Ray


    Yes, 17kph seems to be the figure. I recall reading once that at the
    CSIRO Baseline Air Testing station at Cape Grim on the very NW tip of
    Tassie that they don't have any flies because the winds average over
    17kph from the west(there's a lot of ocean to the west)and the flies get
    blown away. No doubt someone can confirm this or otherwise.
    Halcyon

  7. Halcyon said:


    Quoted message said:
    Quoted message said:


    Fly Speed (assuming no strong wind from any direction) is as above, 17
    k/mh or thereabouts. However, as is well known, they will hang onto your
    back whilst moving and then swarm as soon as you slow down or stop.
    Short of spraying your shirt and knicks with Aerogard I don't see
    there's much you can do about it.
    Cheers,
    Ray


    Yes, 17kph seems to be the figure. I recall reading once that at the
    CSIRO Baseline Air Testing station at Cape Grim on the very NW tip of
    Tassie that they don't have any flies because the winds average over
    17kph from the west(there's a lot of ocean to the west)and the flies get
    blown away. No doubt someone can confirm this or otherwise.
    Halcyon

    I have always found that about 20kph was enough to keep the flies off, which supports the 17kph figures quoted.

    Mike

  8. DaveB said:

    The weather is heating up and the flies are out which really annoy the
    hell out of me on long climbs. On these long climbs I've had plenty of
    time to come up with a theory.

    My theory is that (all brontosauruses are thin at one end ...sorry
    couldn't resist) flies are only prepared to fly at 13kmh to land on me.
    If I'm going 14kmh I'm not worthy of chasing and they leave me alone. Of
    course that only applies if there's no wind. Anyone else noticed this?
    How about a measurement to identify how stinky you are, eg. so stinky
    flies will still follow you at 17kmh 😉

    DaveB

    For mountain bike riders, you don't get march flies in sheoak groves.

    Dorf

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