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 03-29-2012, 08:55 #6 GrizzlyAdams     Join Date: Apr 2007 Location: Illinois Hammock: DIY Bridge, v0.n, where n is large Tarp: depends on season Insulation: DIY UQ Posts: 4,684 Dug out an old physics text and looked up "pulley", hoping there might be something there that sheds some light on the situation. There was. A diagram with a massless frictionless pulley (you gotta pay extra for those), and two masses m1 and m2 suspended from the ends of a string looped over the pulley. Equations given for acceleration of the masses and tension on the pulley. Plug in m = m1=m2, an approximation to the situation at hand, and the equation for tension T = g x 2 x m x m /(m + m) (g is the gravitational constant) gives T = g x m e.g., tension on the string is seemingly constant throughout and is equal to the split load. The top of the loop isn't a weak point. So it would seem that if the load can be transfered immediately to two strands of a whoopie/loopie/x-oopie without being carried first by a single strand, Demostix's observation would hold. I still ain't no mechanical engineer though. YMMV. __________________ Grizz (alias ProfessorHammock on youtube)