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The Space Elevator from Science Fiction to Engineering - page 33 / 50

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The implication of the last graph

If the static coefficient of friction is as low as 0.1, wheels on a 900 kg climber must be compressed together with a total force of 10,000 lbs (5 tons)

= .1 is right in the middle of the expected range for coefficient of friction

Lower would make the ribbon too slippery for traction

< 0.1 is characteristic of sliding bearing materials

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