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RE: A Response to Kryzsec: Brief Thoughts on the Hyperloop
My only issue with hydraulics (having dealt with pneumatic myself) is they require seals as well, hydraulic lines, and a fluid that resists motion. Any air in the lines causes failure (like your car brakes) and any cracks in the lines will cause leakage and failure. I have heard from truckers on large rigs and thats why they use air brakes. My only thought but the train needs to get up to speed for the passive mag lev to work.
I'm aware they still need seals. I just imagine it would be easier to reach the desired speed with an initial launch through hydraulics.
I agree as that's the concept behind passive mag lev, kinda like a 1 wire alternator, it takes energy through motion to jump start the coil. Having hydraulics the entire rail line wouldn't be beneficial in my opinion though.