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Roll back, The big one

Discussion in 'Q&A' started by shaunthatkid, Nov 7, 2018.

  1. shaunthatkid

    shaunthatkid Member

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    This might require some maths or not, what is the maximum wind speed the big one can operate safely at without a potential rollback? Since on Saturday night there where high winds from the SW which significantly slowed the train down on the return and the turn around. In the station we got told to "Fill the cars to maximum capacity filling every seat." Should a car operate when it is not safe to operate on a empty trains.

    Thanks!
     
  2. Hixee

    Hixee Flojector Staff Member Administrator Moderator

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    I'm going to give you the useless answer - we don't know for sure. The number of factors is very high. Without running any sort of model (or a decent source), any figures anyone actually gives you are likely a total fiction.
    • Wind speed (as you ask).
    • The direction and aerodynamic effect of the trains - The crux of this is that the specific shape of the train and direction of the airflow (no just compass direction, but the vertical speed, turbulence, etc) have a huge effect. The drag forces of the wind on the train are staggeringly hard to calculate. At best, you'd have to look to the manufacturers for some of this data.
    • The temperature - Not just the air temperature, but also the wheel/bearing temperatures and things like that.
    • Is the wind constant (unlikely), or gusting (if so, how much)?
    As a quick estimate, it would be fair to say wind speeds approaching the speed of the train over the crest of the hill would start to raise alarm bells, but those bells are probably already tingling at much lower wind speeds if conditions are right.

    The manufacturers probably run some calculations during the designs stage that say something like:
    Assuming a loaded train, and standard operating conditions (temperature, etc), the ride should not operate if the wind speed is gusting over 35mph in a SW direction.

    More sophisticated rides like Dragster (not that PMBO isn't sophisticated, but... come on...) actually record the train speed over the top of the hill and adjust the launch speeds of subsequent trains accordingly. Obviously can't quite do that on a lift hill, but the point is that the designers have ways of understanding this.
     
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  3. shaunthatkid

    shaunthatkid Member

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    that would be true with how aerodynamic if you a train likes the one on suspicious mountain it would slow down.
     
  4. shaunthatkid

    shaunthatkid Member

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    also im not sure if this is photoshopped but while researching i saw this F1 car on a pair of boggies wizzing down the drop is this real?
     
  5. CSLKennyNI

    CSLKennyNI Active Member

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    Nope that was a very real publicity stunt.
     
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  6. Hixee

    Hixee Flojector Staff Member Administrator Moderator

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    One more time, didn't quite catch that. :p

    Not photoshopped, this was real!

    https://www.crash.net/f1/news/46590/1/firman-rides-the-big-one

    EDIT: Oops, @CSLKennyNI beat me to it!
     
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