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I read the 60 pages. If the temp rises only 40F, the tube system will expand 480 feet over 350 miles.
Wall thickness only needs to be .135 for 7'4". I guess they increased the pipe thickness to be "self supporting" over 100 feet spans with the full weight of the "car" in the middle. I'll run some calcs on that later.
I'll put some more stuff up later
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James
The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994)
Red-beard for President, 2020
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