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Leveraging Lift and Tension

Page history last edited by PBworks 14 years, 8 months ago

The same science that gives Wiki:Leveraged Angles of Ropes and Wiki:Leverage Within Knots give abilities to power leveraged rigs and tiedowns with multipliers as shown by Rope Bend Leveraging Spreadsheet that you should be able to manipulate input force and angles for output leverged forces at the given points.


Basically, we have inline pulls, non-inline/leveraged/perpendicualr pulls; and folding the equal and opposite reaction to a force back to target; that i've called 2Handing. The zrig.swf animation shows some 2handing and inline concepts seperately and together. The more elusive leveraging of perpendicular force hails from Brion Toss's "Rigger's Apprentice" books descriptions of sweating a line by angular pull to capture the purchace behind the friction of a bollard on ships.


The top drawing shows some of the inline strategies of 2Handing(to use pulling force and then it's equal and opposite force too/ pulley on anchor) and traditional pulley pulls(multiplying input force with extra legs of pull on load/not anchor). The 2nd drawing shows, taking the inline rig tightend with the first drawing; locking the rig off to self, and bending it; using the alternative non-inline/leverged/perpendicular pull(s).


Though in stage 1/ inline tightening; more efficient/less friction bends of pulleys etc. is easier; some friction on the bends like going through a ring to tie down, avail more to leverging the line input with perpendicualr force, then capturing the purchase behind the friction of the ring. It is most powerful, to use a stage 1 pretightening of an inline rig(even if sweated), and then bending it with stage 2. The return of leverge in stage 2 is dependant on the line tightness/ resistance to bending of stage1. Because the higher leveraging is in the softer bends right off inline/straight; multiplied by the force it takes to bend the line so.






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