On 11/18/12 1:32 PM, John E. Cleeve wrote:
Gentlemen,
If you are interested, there is a film, available on the Crystal Palace
web site, which shows how the 800ft London BBC Television tower at Crystal
Palace, SE London, was designed, and then built and erected, using muscle
and ropes, no safety lines are visible, well worth watching.
I would like to see how a tower, like the one in the video is erected,
from the ground up, my question being, to what did the riggers attach
their safety harness? Does anyone know of an accessible video/film?
wouldn't it be like being leader on a rock climb. You have protection
slightly below you, so your maximum distance of fall is 2x height above
protection. You depend on the springyness of the belay rope, and the
worst case is a fall factor of 2: the fall distance is 2x the total
rope length.
the fear when climbing rocks is the "zipper" out problem.. you fall, the
first pro catches, then pops, then the next, then the next, until you
either hit the end of the rope or the ground (or hopefully, bushes and
trees at the bottom of the pitch)
Your boldness when leading largely determines how often you put
protection in. And when there's a dicey move, you ask your belayer to
take out the slack.
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