• COTA surface alarms MotoGP riders

    From Mark Jackson@21:1/5 to All on Sat Oct 2 10:08:24 2021
    https://the-race.com/motogp/for-me-we-cannot-race-motogps-cota-crisis-explained/

    F1 is to race there in three weeks; bikes are more sensitive to bumps,
    but still. . . .

    --
    Mark Jackson - https://mark-jackson.online/
    I doubt that there’s something about British culture
    that makes the country especially good at lipids.
    - Paul Krugman

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  • From News@21:1/5 to Mark Jackson on Mon Oct 4 10:41:50 2021
    On 10/2/2021 10:08 AM, Mark Jackson wrote:
    https://the-race.com/motogp/for-me-we-cannot-race-motogps-cota-crisis-explained/


    F1 is to race there in three weeks; bikes are more sensitive to bumps,
    but still. . . .



    The instability of expansive Texas clays has been a problem from before
    COTA's first race event.

    Can F1 deal with the same issues as World Endurance Championship, IMSA WeatherTech SportsCars, Pirelli World Challenge, and Trans Am cars?

    Stay tuned.

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  • From a425couple@21:1/5 to News on Wed Oct 6 16:30:34 2021
    On 10/4/2021 7:41 AM, News wrote:
    On 10/2/2021 10:08 AM, Mark Jackson wrote:
    https://the-race.com/motogp/for-me-we-cannot-race-motogps-cota-crisis-explained/


    F1 is to race there in three weeks; bikes are more sensitive to bumps,
    but still. . . .



    The instability of expansive Texas clays has been a problem from before COTA's first race event.

    Can F1 deal with the same issues as World Endurance Championship, IMSA WeatherTech SportsCars, Pirelli World Challenge, and Trans Am cars?

    Stay tuned.

    I wonder what they do about the situation
    at the nearby airport?

    an excerpt from: https://www.cycleworld.com/story/motorcycle-racing/2021-cota-motogp-wrap-up/

    "Bumpy Surface, and What Can Be Done
    Nearly everyone was stunned by what riders were calling “holes” or “bumps.” But just arriving at the circuit in your rental car from the
    back access road reveals what they mean—the clay soil’s constant heaving introduces waves into the track. Panic and desperation! Convene the
    Safety Commission and shout with one mighty voice that we can’t ride!

    The problems were concentrated on turns 2 through 10; fortunately the
    very fast straight (210-mph max for Jack Miller’s Ducati) had been
    recently leveled. These waves are not subtle, and it takes more than a
    bit of grinding and patching here and there to flatten them. When clay
    absorbs water it expands; when the water departs, it contracts. Bikes
    were getting air, and there were some resulting crashes. Márquez stated
    that circuits with walls close to the pavement are more dangerous (COTA
    is not one of these), and that a rider can find a way across the COTA
    waves. But he also said, “…the bumps are in the limit…because they are not real bumps. It’s more like the surface is moving.”

    Teams and riders took measures against the waves—using softer springs to better isolate the chassis from the pavement, and as a means of not
    getting launched off the crests, spinning and losing stability. At the
    end of the weekend the rider consensus was that they’d race on Sunday,
    but wouldn’t come back next year unless something can be done.

    It’s not clear what that can be, for in constructing this track the
    nature of the subsoil dictated digging down 8 feet, backfilling with
    gravel, then grading and paving. Since this part of Texas was once the silt-accumulating bottom of a warm, shallow sea, the clay may be very
    deep indeed. Who knows how the water within comes and goes?"

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  • From texas gate@21:1/5 to texas gate on Wed Oct 6 18:56:31 2021
    On Wednesday, October 6, 2021 at 7:51:16 PM UTC-6, texas gate wrote:
    On Wednesday, October 6, 2021 at 5:30:31 PM UTC-6, a425couple wrote:

    Who knows how the water within comes and goes?"
    ask lewis hamilton ffs

    he will blame it on global warming
    that hydrocarbon burning hypocrite

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  • From texas gate@21:1/5 to News on Wed Oct 6 18:44:53 2021
    On Monday, October 4, 2021 at 8:41:52 AM UTC-6, News wrote:

    The instability of expansive Texas clays

    lol

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  • From texas gate@21:1/5 to All on Wed Oct 6 18:51:14 2021
    On Wednesday, October 6, 2021 at 5:30:31 PM UTC-6, a425couple wrote:

    Who knows how the water within comes and goes?"

    ask lewis hamilton ffs

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  • From texas gate@21:1/5 to News on Wed Oct 6 20:59:54 2021
    On Monday, October 4, 2021 at 8:41:52 AM UTC-6, News wrote:

    The instability of expansive Texas clays

    post a map of these expansive clays in texas. thanks

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  • From texas gate@21:1/5 to News on Wed Oct 6 20:49:51 2021
    On Monday, October 4, 2021 at 8:41:52 AM UTC-6, News wrote:

    The instability of expansive Texas clays

    Wow. A geologist in the group.

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  • From texas gate@21:1/5 to News on Wed Oct 6 21:19:01 2021
    On Monday, October 4, 2021 at 8:41:52 AM UTC-6, News wrote:

    Texas Clay

    Is that not the name of your boyfriend too?

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  • From ~misfit~@21:1/5 to All on Thu Oct 7 18:42:29 2021
    On 7/10/2021 12:30 pm, a425couple wrote:
    On 10/4/2021 7:41 AM, News wrote:
    On 10/2/2021 10:08 AM, Mark Jackson wrote:
    https://the-race.com/motogp/for-me-we-cannot-race-motogps-cota-crisis-explained/

    F1 is to race there in three weeks; bikes are more sensitive to bumps, but still. . . .



    The instability of expansive Texas clays has been a problem from before COTA's first race event.

    Can F1 deal with the same issues as World Endurance Championship, IMSA WeatherTech SportsCars,
    Pirelli World Challenge, and Trans Am cars?

    Stay tuned.

    I wonder what they do about the situation
    at the nearby airport?

    It wouldn't surprise me if the runways at the airport aren't thick concrete (maybe with an asphalt
    topping?).

    <snipped>
    --
    Shaun.

    "Humans will have advanced a long, long way when religious belief has a cozy little classification
    in the DSM"
    David Melville

    This is not an email and hasn't been checked for viruses by any half-arsed self-promoting software.

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  • From News@21:1/5 to All on Thu Oct 7 09:42:46 2021
    On 10/7/2021 1:42 AM, ~misfit~ wrote:
    On 7/10/2021 12:30 pm, a425couple wrote:
    On 10/4/2021 7:41 AM, News wrote:
    On 10/2/2021 10:08 AM, Mark Jackson wrote:
    https://the-race.com/motogp/for-me-we-cannot-race-motogps-cota-crisis-explained/


    F1 is to race there in three weeks; bikes are more sensitive to
    bumps, but still. . . .



    The instability of expansive Texas clays has been a problem from
    before COTA's first race event.

    Can F1 deal with the same issues as World Endurance Championship,
    IMSA WeatherTech SportsCars, Pirelli World Challenge, and Trans Am cars? >>>
    Stay tuned.

    I wonder what they do about the situation
    at the nearby airport?

    It wouldn't surprise me if the runways at the airport aren't thick
    concrete (maybe with an asphalt topping?).

    <snipped>

    Austin's airport is the former Bergstrom US Air Force Base, which at its
    peak, hosted B-52 and KC-135 operations. Concrete slabs are probably 3
    feet thick on the runway and two feet thick on the ramp.

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  • From Alan Baker@21:1/5 to texas gate on Thu Oct 7 15:51:18 2021
    On 2021-10-06 8:59 p.m., texas gate wrote:
    On Monday, October 4, 2021 at 8:41:52 AM UTC-6, News wrote:

    The instability of expansive Texas clays

    post a map of these expansive clays in texas. thanks


    <https://www.ghba.org/wp-content/uploads/texas-high-expansive-clay-soil-map.jpg>

    'The construction of roads on naturally occurring expansive soils has
    been generally avoided due to their high potential to swell that will
    produce significant volume changes and uplift forces on the pavement
    layers and have relatively low strength values.'

    <https://www.researchgate.net/publication/271508823_Performance_and_Design_of_Expansive_Soils_as_Road_Subgrade>

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  • From Sir Tim@21:1/5 to Alan Baker on Thu Oct 7 23:38:40 2021
    Alan Baker <notonyourlife@no.no.no.no> wrote:
    On 2021-10-06 8:59 p.m., texas gate wrote:
    On Monday, October 4, 2021 at 8:41:52 AM UTC-6, News wrote:

    The instability of expansive Texas clays

    post a map of these expansive clays in texas. thanks


    <https://www.ghba.org/wp-content/uploads/texas-high-expansive-clay-soil-map.jpg>

    :-) nice one.


    'The construction of roads on naturally occurring expansive soils has
    been generally avoided due to their high potential to swell that will
    produce significant volume changes and uplift forces on the pavement
    layers and have relatively low strength values.'

    <https://www.researchgate.net/publication/271508823_Performance_and_Design_of_Expansive_Soils_as_Road_Subgrade>




    --
    Sir Tim

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