Why do you want zero friction along the major axis? Linear speed of pipe movement through the bearing would be very low: not more than couple hundred feet per d

Why do you want zero friction along the major axis? Linear speed of pipe movement through the bearing would be very low: not more than couple hundred feet per day. And what do you mean by zero slop? By the way, if you want to continue speculating on Hyperloop thermal expansion issue, you can join my speculations - I wrote a few comments under this blog post: http://blog.rongarret.info/2013/08/everything-you-need-to-know-about.html http://blog.rongarret.info/2013/08/everything-you-need-to-kn...