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  1. #1
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    Math Geeks... Crunch The Numbers

    Serious deceleration. How many Gs?

    https://www.yahoo.com/news/latest-na...172549393.html

    The robotic geologist designed to explore Mars' mysterious insides must go from 12,300 mph (19,800 kph) to zero in six minutes flat as it pierces the Martian atmosphere, pops out a parachute, fires its descent engines and lands on three legs.

    https://sciencing.com/calculate-dece...n-6081657.html

  2. #2
    .je
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    I get -15.25 m/s^2, which is average 1.56 Earth g, or 4.0 Mars g.

  3. #3
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    I hope they use a flux capacitor to reach that kind of speed!

  4. #4
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    It's not speeding up, it's slowing down!

    Really not that impressive, F1 get way over that going around a corner.
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  5. #5
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    Quote Originally Posted by duriel View Post
    Really not that impressive, F1 get way over that going around a corner.
    Right. And to more directly compare straight-line deceleration, they can brake at up to 5 G. Combined with the acceleration ability, the cars can go from zero to 200 kph and back to zero in something like 8 seconds.
    "None of us knows for sure what's out there; that's why we keep looking. Keep your faith; travel hopefully. The universe will surprise you, constantly." The 13th Doctor.

  6. #6
    tlg
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    Calculating deceleration over 6min wouldn't equate to very high G's as it'd be gradually decreased. I'm be more interested in knowing the 5-10 seconds after the chute opens. That would be a large spike.
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  7. #7
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    Quote Originally Posted by tlg View Post
    Calculating deceleration over 6min wouldn't equate to very high G's as it'd be gradually decreased. I'm be more interested in knowing the 5-10 seconds after the chute opens. That would be a large spike.
    I suspect the maximum deceleration rate is before the parachute phase, when atmospheric resistance is slowing the vehicle and the heat shield gets to 1000C. This video from JPL says it peaks at 12G.
    https://www.youtube.com/watch?v=PDSbUpmRksI
    "None of us knows for sure what's out there; that's why we keep looking. Keep your faith; travel hopefully. The universe will surprise you, constantly." The 13th Doctor.

  8. #8
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    Quote Originally Posted by JCavilia View Post
    This video from JPL says it peaks at 12G.

    you math geeks disappoint me.


    comparing 6 minutes of deceleration to relatively momentary G of an F1? Pffffft!


    This thing had nothing but PLANET in it's windshield, a thin atmosphere, a chute, short term retros and 6 minutes to avoid splat! C'mon boys and girls. Next time, bring your "A" game.

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