Apr 9th, 2017: Hsuehshan Tunnel

footfootfoot · 04-15-2017, 07:58 PM

That was an amazing piece of equipment. If my math is right, the cutter face is moving at close to 2 meters per second at the outer edge.

xoxoxoBruce · 04-15-2017, 11:21 PM

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.

04-15-2017, 07:58 PM	#1
footfootfoot To shreds, you say? Join Date: Aug 2004 Location: in the house and on the street-how many, many feet we meet! Posts: 18,449	That was an amazing piece of equipment. If my math is right, the cutter face is moving at close to 2 meters per second at the outer edge. __________________ The internet is a hateful stew of vomit you can never take completely seriously. - Her Fobs

04-15-2017, 11:21 PM	#2
xoxoxoBruce The future is unwritten Join Date: Oct 2002 Posts: 71,105	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. __________________ The descent of man ~ Nixon, Friedman, Reagan, Trump.

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