Lift Ratios
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Ring Friction37%
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Carabiner Friction37%
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Rope on Rope Friction67%
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Pulling Down - Rope on RopePulling Up - Rope on Rope
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RatioFrictionTensionRing LoadLifted LoadMeasuredRatioFrictionTensionRing LoadLifted Load
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1.001.00
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1:137%0.631.630.631:11.001.00
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2:167%0.211.840.842:167%0.330.331.33
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3:137%0.131.970.970.973:137%0.210.541.54
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4:167%0.042.011.014:167%0.070.611.61
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5:137%0.032.041.041.055:137%0.040.651.65
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6:167%0.012.051.056:167%0.010.661.66
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7:137%0.012.051.057:137%0.010.671.67
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8:167%0.002.061.068:167%0.000.681.68
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Pulling Down - Carabiner on BottomPulling Up - Carabiner on Bottom
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RatioFrictionTensionRing LoadLifted LoadRatioFrictionTensionRing LoadLifted Load
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1.001.00
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1:137%0.631.630.631:11.001.00
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2:137%0.402.031.032:137%0.630.631.63
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3:137%0.252.281.281.293:137%0.401.032.03
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4:137%0.162.431.434:137%0.251.282.28
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5:137%0.102.531.531.555:137%0.161.432.43
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6:137%0.062.601.606:137%0.101.532.53
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7:137%0.042.641.647:137%0.061.602.60
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8:137%0.022.661.668:137%0.041.642.64
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Starting at HarnessStarting at Ring
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RatioPullingRopeBinerRatioPullingRopeBiner
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1:1Up1.001.002:1Up1.331.63
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1:1Down0.630.632:1Down0.841.03
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3:1Up1.542.034:1Up1.612.28
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3:1Down0.971.284:1Down1.011.43
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5:1Up1.652.436:1Up1.662.53
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5:1Down1.041.536:1Down1.051.60
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7:1Up1.672.608:1Up1.682.64
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7:1Down1.051.648:1Down1.061.66
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1:1Up1.001.002:1Up1.331.63
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3:1Up1.542.034:1Up1.612.28
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5:1Up1.652.436:1Up1.662.53
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7:1Up1.672.608:1Up1.682.64
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1:1Down0.630.632:1Down0.841.03
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3:1Down0.971.284:1Down1.011.43
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5:1Down1.041.536:1Down1.051.60
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7:1Down1.051.648:1Down1.061.66
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Force to Lift 100 lb (Starting at Harness)Force to Lift 100 lb (Starting at Ring)
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RatioPullingRopeBinerRatioPullingRopeBiner
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1:1Up100 lb100 lb2:1Up75 lb61 lb
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3:1Up65 lb49 lb4:1Up62 lb44 lb
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5:1Up61 lb41 lb6:1Up60 lb39 lb
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7:1Up60 lb39 lb8:1Up60 lb38 lb
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1:1Down159 lb159 lb2:1Down119 lb97 lb
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3:1Down103 lb78 lb4:1Down99 lb70 lb
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5:1Down96 lb65 lb6:1Down95 lb63 lb
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7:1Down95 lb61 lb8:1Down95 lb60 lb
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Pulley Efficiency References
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http://www.bwrs.org.au/sites/default/files/PulleyReport/PulleyReport-w.html
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http://blog.omcgear.com/pulleys-mountaineering/
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http://postimg.org/image/kmsnzvftn/
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