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  1. Default He did it: Redbull Stratos jump!


    http://www.redbullstratos.com/live/
    ^ live stream there.

    in short: crazy man is going to jump 120k feet/36km, just on the border of earths atmosphere.
    they are currently rolling out the balloon.

    I searched for a thread, no results.

    edit: he reached 39 kilometers and a maximum speed of 1172 kmph, which is around 720mph(help here).
    Last edited by Imitazion; 2012-10-14 at 03:41 PM.

  2. Desk Straight Male
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    Default Re: TODAY: Redbull Stratos jump!


    It's starting!

    Hope it ends well.


    Edit: Mission Aborted?

  3. Default Re: TODAY: Redbull Stratos jump!


    I heard about this on the radio, he wants to break the sound barrier or something

    edit: 36.5km skydive attempt aborted because of high winds in New Mexico.

  4. AFK at Ch 18 Leafre Straight Male
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    Default Re: TODAY: Redbull Stratos jump!


    Oh god, the past few days has been the craziest. Some guy trying to have that lightning thing through the body thing with chainmail and stuff and this.

  5. Default Re: TODAY: Redbull Stratos jump!


    So uh... I'm watching this live on TV. Anyone else?

  6. Default Re: TODAY: Redbull Stratos jump!


    Me too!

    Live update: nothing has happened.

    edit: it's been an hour. NOTHING HAS HAPPENED
    Last edited by Mazz; 2012-10-14 at 01:22 PM.

  7. Default Re: TODAY: Redbull Stratos jump!


    Only 4k more feets until he jumps.

  8. Default Re: TODAY: Redbull Stratos jump!


    Noooo the vid doesn't work, hope everything turn out fine

  9. Default Re: TODAY: Redbull Stratos jump!


    He jumped and landed; free fall for 4:19

  10. Default Re: TODAY: Redbull Stratos jump!


    Just found out about this. turned it on, he already landed

    Sucks to be me.


  11. Default Re: TODAY: Redbull Stratos jump!


    Close, mach 1 is 768mph.

  12. Default Re: TODAY: Redbull Stratos jump!


    But the higher up you are, the slower sound moves compared to down here at sea level. I'm not sure if he reached Mach 1.
    Would require the speed of sound to have been 729 mph where he reached that speed himself.

  13. Default Re: TODAY: Redbull Stratos jump!


    Apparently he reached 833mph, which is over mach 1.


  14. Default Re: TODAY: Redbull Stratos jump!


    only crazy white people will do this pomegranate.

  15. Default Re: TODAY: Redbull Stratos jump!


    Asians genetials are too small to attempt this sh`it.

  16. Default He didn't actually do it: Felix Baumgartner's Mach Jump


    I've done some calculations and it's impossible for him to have reached even Mach 1.

    Assuming constant gravitational acceleration (it varies from 9.81m/s at sea level to 9.69m/s at the start of his jump) and no friction.
    He fell 119846ft (from 128000ft to 8154ft) in 4min19s = 259seconds.

    So his average speed during the fall is Vavg = 36529m/259s = 141.04 m/s

    His acceleration during fall is something of the form:
    a = C - f(V), where f(V) is an always positive and monotonically increasing function of V that never exceeds C.

    By that we can see that v(t) is a monotonically increasing, concave function (its first derivative is positive and its second derivative is negative).

    Having that, the highest maximum velocity he could have had at the end of 259 seconds would be if his speed profile, v(t) was a straight line (no friction).
    That velocity would be 2*Vavg = 242.08m/s or Mach 0.82
    QED

    Adding friction to the equation only lowers his maximum speed.

    Disclaimer: This doesn't take away from the rest of the records he broke.

  17. Nuclear testing facility Straight Male
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    Default Re: He didn't actually do it: Felix Baumgartner's Mach Jump


    Acceleration isn't uniform here. You can't claim v is linearly proportional to t ergo 2*Vavg=/=Vmax

    Even with that brutal approximation he certainly didn't fall straight down. Even a 10 degree deviation would put him over mach 1.
    /* 36.529/cos(10)=37.1
    37.1km/259s=143m/s
    143*2=286m/s > mach 1 */


    If I get really bored on Friday I'll try to find an estimation for his drag because working out the actual boundary equations would give me a brutal headache. I'm a physicist not an engineer dammit!

  18. Default Re: He didn't actually do it: Felix Baumgartner's Mach Jump


    I'm not saying his acceleration is actually uniform, only that it sets an upper boundary to his maximum speed.
    I hadn't considered the possibility that he'd fall at an angle though, that's an interesting approach.

    Mach 1 is actually 343.2 m/s by the way.

    Still for him to reach Mach 1.24 the angle would have to be:

    2*36529/(259*cos(x)) = 1.24*343.2 => x = 48

    Yeah, he didn't fall at a 48 angle, nope.

    /* For Mach 1 you'd still have an angle of nearly 35 which I still severely doubt possible. */

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