Stability of rock boulders as highline anchorsJust before christmas 2009, the first close to fatal highline accident happened in america. The highliners were very experienced but obviously misestimated the stability of boulders lying on the top of rock when used as highline anchors.
This page tries to give a brief check, if boulders are big enough for anchoring highlines. Nevertheless, this is a theoretical model and it does not guarantee that a boulder declared safe, can't move under any circumstances.
This simple model ignores the influence of angular momentums and is therefore not suitable for judging the stability of rock needles. Highlining is dangerous and a backup on seperate anchors is always necessary!
The block has a mass of
0kgOn an even surface the block can withstand a
sideward force (applied below the center of gravity) of