4 ms·

The 9 engineering points at the end of the text, are very important and extremely dificult each one of them. I would add a pod decompression, and the emergency

• MertsA 11y ago
  > you can not dissipate the kinetic energy of a pod traveling at 900km/h just by friction without a brake fire. Sure you can, just use water stored onboard to cool the brakes. Obviously the only case when you would need to use friction brakes in the hyperloop is in an emergency so we're fine with just boiling away the water into the steel tube. It takes 2,261 KJ per kg to boil water in the vacuum of the tube and assuming a pod weighs in at 1000 kg and is travelling 300 m/s that gives us 45 MJ of kinetic energy to deal with. That comes out to just under 20 kg of water to stop a 1000 kg pod moving 300 m/s. That's a decent size tank when considering the form factor of a hyperloop pod but still doable.