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Thread: The Gravity Train

  1. #1 The Gravity Train 
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    The Gravity Train is an interesting scientific concept. A cool video introducing it is here The Gravity Train - YouTube

    What do you guys think?

    Cheers


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  3. #2  
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    Fun idea, but it's big limitation is you can't really go below the Earth's crust without experiencing extreme temperatures and pressure so couldn't build that tunnel. But for more fun you can use a shallow tunnel model, say 25 km deep and see how far this takes you. I'm not sure what our deepest penetration is so far: 10km?
    Or
    what about the Moon or even Mars?


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  4. #3  
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    Then there is the friction problem. If we could eliminate friction, theoretically we could go anywhere we want without expenditure of energy, on the surface. You'd just need energy to accelerate, but then you could compress a spring or something on deceleration and use that energy for your next trip.
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  5. #4  
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    Below a certain depth the pressure release of a borehole will allow the rock to become molten. Even ignoring this problem, rocks will deform plastically and the holes won't last long.
    "The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at or repair." ~ Douglas Adams
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  6. #5  
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    If we ever do develop sufficient technologies for such a train, air travel would have probably surpassed the 42 minute time anyway! Do give it a vote as a friend and I made it.

    Thanks
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