Quote:
Originally Posted by red-beard
I read the 60 pages. If the temp rises only 40F, the tube system will expand 480 feet over 350 miles.
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TUBE temp, not ambient temp. So, prevent the tube from going up 40 degrees. Pre-heat it (they have pods full of steam and 1000 degree low pressure air, the entire system will probably run well above ambient, with only the pod interior conditioned, which is easier with a nearly perfect vacuum around it, no convective or conductive heat transfer between the cool pod and the hot tube...