
Originally Posted by
alwaysinjured
For anyone interested in math modelling - you choose the length of the sling to give you just sufficient freedom to climb up at the horizontal distance of the flake foothold from the corner. therefore if the platform were not there the fall would in essnce be a pendulum at the radius of that distance ( perhaps 3 m). Calculate the energy you have mgh - to calculate the hirozontal velocity at the positon below the corner, 0.5mv2 - so v2=2gh - where h is the same radius r from that velocity calculate the centripetal force taken by the rope or sling mv2/r - and you can see that the force taken for a 100kg climber would be of order kN on a sling with breaking strain20 kn plus even if there was no platform. The motion is essentially lateral/ pendulum.
Except the fall is halted by impact with the platform and all that energy dissipated before the sling has to take very much at all.
It is not a vertical fall on a static sling, it is only there to stop a slip, after impact with the platform
If you dont believe me or have concerns take a short length of rope - the thread is focussing on the wrong issue - the abiliuty to protect with nuts removable from above. You can take the rope with pretied half figure of 8, attached to the nuts by screwgate, and all you have to do is take it out of bumbag, sot the nuts, complete the figure of 8 ,up you go and one short yank takes out the nuts. Back in bumbag. done.