= Space Elevator Numbers =
mostly from "Space Elevators: An Assessment ..."
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 * 27 MYuri working stress, 35.2 GPa (p32)
  * 38 MYuri, 49.4 GPa @ 1.3 g/cm3
  * 1.4 safety factor
 * Taper ratio 6
 * 6300 metric tons tether
 * 1900 metric tons Apex
 * 100,000 km radius