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Yes, when I was told the maximum speed of a Chinook's rotor blades was 102 rpm it seemed slow. When I questioned it they said the tips are doing 500mph, and if you add the helicopter moving at 200mph, you're getting close to breaking the sound barrier. OH... duh, I'm glad somebody figures all that shit out.
I'm sure somebody figured out how fast the can spin the rock cutters and probably adjust it as the material changes. They have a lot invested in that machine, a big bet.
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The descent of man ~ Nixon, Friedman, Reagan, Trump.
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