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science fair

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01 / Original postscience fairRob-The-Unrepen · 2 Apr 2004 02 / This pagePosts 1–6Page 1 of 1 · chronological order 03 / Latest replyPost #6Beelzebub Of Ba · 2 Apr 2004

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rec.sport.unicycling archive
Published
2 April 2004
Last activity
2 April 2004
Original author
Rob-The-Unrepen
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Tyre pressure

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  1. Original post
    Rob-The-Unrepen
    Archived post
    #1

    I'm a 7th grader, and am doing a unicycle related science fair project.
    I had someone coast 5 meters, with different tire inflations, and I
    timed him. As I expected he went slower with the way under inflated
    tire, but I need some research about tire inflation, and its affect on
    speed, but when I google search it, it dosnt come up with anything
    helpful. Could someone point me to a good website. 😕

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  2. Joona
    Archived post
    #2

    You pretty much said it yourself. More air -> harder tire ->
    less rubber on ground -> less friction -> more speed.The
    pattern of the tire affects too. I've seen a finnish site
    that had info about inflation and how much effect different
    tubes have on friction. The mass of the tire also affects.
    If you have a heavier tire it rolls a bit farther (and if
    you compare to a lighter tire at the same spot, faster).

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  3. Klaas Bil
    Archived post
    #3
    Rob-the-unrepentant said:

    I had someone coast 5 meters, with different tire
    inflations, and I timed him.

    I suppose that was done on a bike, not a unicycle?

    Quoted message said:

    I need some research about tire inflation, and its
    affect on speed

    Schwalbe has (or had) a graph of rolling resistance version
    tyre pressure on their website. I forgot the url. If you
    Google for a few of those terms combined, you may find it
    and other helpful sites.

    Klaas Bil - Newsgroup Addict
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    are not normal. - John Childs

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  4. Checkernuts
    Archived post
    #4

    The only problem I see with timing somone coasting is that
    thier speed starting might be slightly different every time
    which would change your results and not give you the
    results you want.

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  5. Jagur
    Archived post
    #5
    Rob-the-unrepentant said:

    *Get a PS2, Xboxes are [censored] *


    'This Thread' (tinyurl.com3248f)

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    jagur - Random Unicyclist

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  6. Beelzebub Of Ba
    Archived post
    #6

    Go to google, and enter:

    "rolling resistance" "tire pressure" research

    You will find a variety of articles.

    Good luck,

    David Maxfield Mitchell, SD

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    beelzebub of balance - Junior Member of the Universe

    David Maxfield
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