3 ms·

For it to be enough of the vacuum to yield real benefits in terms of The fluid dynamics of the air of the tunnel, it needs to be hard enough to be hard to achi

For it to be enough of the vacuum to yield real benefits in terms of The fluid dynamics of the air of the tunnel, it needs to be hard enough to be hard to achieve as in this case. It is easier to achieve than the kind of vacuum NASA might want to draw to test devices, or that somebody with a Watt balance might need, but honestly that only goes to show how horrendously difficult it is to pull that kind of vacuum

kbenson 9y ago
There are plenty of breakdowns of the specific numbers that were given in the proposal. If you know enough to contradict one of those assessments or have enough knowledge of the engineering and current technology required to assess the proposal as a whole, feel free to submit your own numbers or point to the assessment you believe best covers the reality of the situation. Otherwise, definitive statements about small portions of a rather large and complicated proposal that don't provide evidence for their assertions aren't really worth reading. Sorry if that comes across as harsh (it's less directed at you, and more towards the situation as a whole), but this topic is so fraught with people making assertions based on rumors and assumptions rather than the actual data presented that there's a real problem wading through the misinformed to get to the useful information.
- QAPereo 9y ago
  If you have those numbers to share, great, otherwise...
  - kbenson 9y ago
    The original proposal is available.[1] It includes enough numbers to make estimates of the physics involved. If you want to see what's essentially two youtubers arguing over the physics involved, check this[2] out. It gets a little petty by the end, but there is copious physics and math demonstrated, which you can assess yourself (along with whether the assumptions they make are valid). They do, specifically, go over what would be required to achieve the level of partial vacuum specified, as well as what would be required to safely achieve controlled rapid pressurization in an emergency. Or you can do a little googling. There's plenty of people that have jumped in with an assessment, and just about as many that have come after to refute some or all of their work. 1: http://www.spacex.com/sites/spacex/files/hyperloop_alpha.pdf http://www.spacex.com/sites/spacex/files/hyperloop_alpha.pdf 2: https://www.youtube.com/playlist?list=PLSPi1JFx4_-Gz0Fm0qq2KUz4c22UbZCco https://www.youtube.com/playlist?list=PLSPi1JFx4_-Gz0Fm0qq2K...

kbenson 9y ago

There are plenty of breakdowns of the specific numbers that were given in the proposal. If you know enough to contradict one of those assessments or have enough knowledge of the engineering and current technology required to assess the proposal as a whole, feel free to submit your own numbers or point to the assessment you believe best covers the reality of the situation. Otherwise, definitive statements about small portions of a rather large and complicated proposal that don't provide evidence for their assertions aren't really worth reading. Sorry if that comes across as harsh (it's less directed at you, and more towards the situation as a whole), but this topic is so fraught with people making assertions based on rumors and assumptions rather than the actual data presented that there's a real problem wading through the misinformed to get to the useful information.

QAPereo 9y ago
If you have those numbers to share, great, otherwise...
- kbenson 9y ago
  The original proposal is available.[1] It includes enough numbers to make estimates of the physics involved. If you want to see what's essentially two youtubers arguing over the physics involved, check this[2] out. It gets a little petty by the end, but there is copious physics and math demonstrated, which you can assess yourself (along with whether the assumptions they make are valid). They do, specifically, go over what would be required to achieve the level of partial vacuum specified, as well as what would be required to safely achieve controlled rapid pressurization in an emergency. Or you can do a little googling. There's plenty of people that have jumped in with an assessment, and just about as many that have come after to refute some or all of their work. 1: http://www.spacex.com/sites/spacex/files/hyperloop_alpha.pdf http://www.spacex.com/sites/spacex/files/hyperloop_alpha.pdf 2: https://www.youtube.com/playlist?list=PLSPi1JFx4_-Gz0Fm0qq2KUz4c22UbZCco https://www.youtube.com/playlist?list=PLSPi1JFx4_-Gz0Fm0qq2K...