Making an IronCross on the rings very tough(yet have to put something else with it for highest 'C' credit for move)....
Another part of the formulae, on a speedline would be that it (apart form these worse case loaded examples of horizontally loaded line) would be slanted. That would take some of the load's support away (allowing motion), and not incur that part of the unsuported load on the support system of the line. So a straight vertical line would not be loaded like this (or at all save frction from load passing?), and horizontal at maximum loading, points in between unevenly incremented as to marginal change, favoring most dynamic change per degree of angle change near the most leveraged position (horizontal)(?). i always like to know which way the graph slants, where it peaks; watching for the aids and pitfalls of the most dynamic part of the curve...
Thus in the motion of the load on the speedline, the part of the force traveling forward is not traveling down, once again looking at pulls in 2 directions and diagnosing the effects of each seperately, then approximating the degree of effect of each on particular example, for view into possibilities of what is happening.
So the dip angle/line slack in preset tightness is less important with increased towards vertical slant, for it is loaded less; and for a shorter time. The same line setup loaded with a branch caught under the slide connection, would have same math for longer time? But if that frictional drag decreased speedwise the way the load impacted the line, that could help....? If the impacting was s-light enough, quick enough then converted to forward motion,there'd might be some kind of window where the 'spike on the graph' of loading was so quick etc. as not to be 'noticed' by the anchors?? While 2 spread out support /slides would angle line less?
In the ISA post above; thee man (Peter) asked directly about this difficult subject, by Dave Spencer no less(that wrote the speedline spread sheet?); was none other than Dr. Peter Donzelli; engineer, climber, writer who died months later when a lightning struck top detatched with him on it. His deep contributions to understanding these things around us still reign supreme, and their evolution from him is missed. All his calculations and writings (Art and Science of Rigging, ISA articles etc.)he left, bear mute testimony that even the most carefull and calculatingly could be called at any time....
Orrrrr something like that!
:angel:
edit i once saw a guy do a run'roundoff'back handsprings instead of walking straight white line on the side of the road to prove he din't drink and drive........ got off too! 'Course we din't want him to drive anymore....
