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Published byIan Rosemond Modified over 2 years ago

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3:1 “Z” System 100% efficient pulleys Instructions on how to perform a “T Analysis” 1) Draw out your system 2) Start by applying T=1 where you would haul/pull on the system 3) T value into a pulley is = T value out of pulley 4) T value behind the pulley is the sum of input & out put values 5) T values sum at intersections (i.e. pulley / prusik intersection of main line) 6) T value at load = mechanical advantage (MA) of system load Anchor T1 T2 T1 T3T3 (T1 + T2) T2 HAUL: 3:1 T1 Note / step 2 Note / step 3 Note / step 6 Note / step 5 Note / step 4

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= 100% Pulley = Prusik = 80% Pulley = 50% Pulley 3:1 “Z” System load Anchor T =1 T = 2 T = 1 T = 3T = 1 + 2 100% efficient pulleys T = 2 load Anchor T = 1 T = 0.8 T = 1.8 T = 0.4 T = 2.2T = 0.4 + 1.8 80% efficient at moving pulley & 50% efficient pulley at COD/anchor T = 1.2 load T =1 T = 0.5 T = 1.5 T = 0.4 T = 1.9T = 0.4 + 1.5 50% efficient at moving pulley & 80% at COD/anchor Anchor T = 0.9

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Set of 4s with 5:1 MA & 4:1 MA Anchor Load T1 T2 T1 T2 T1 T2 T1 T4 (T2+T2) T1 T2 HAUL, 4:1 MA Fixed end of 8 mm cord AnchorLoad T1 T2 T1 T2 T1 T2 T1 T5 (T2+T2+T1) T1 T2 HAUL, 5:1 MA Fixed end of 8 mm cord T1

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11:1 Double Compound “Z” System T3 (T1 + T2) load Anchor T1 T5 T6 T5 (T3 + T2) T10 HAUL = 11:1 T1 T2 T1 T3 T11 (T5 + T6) T1 T2 T1 = Prusik = 100% Pulley 5:1 Compound “Z” System load Anchor T1 T3 T2 T6 HAUL = 5:1 T1 T2 T1 T5 (T3 + T2) T3 (T1 + T2)

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Pulley Systems. Pulley Systems - Definitions Sheave is the grooved wheel that the rope runs on The larger the diameter of the sheave, the less friction.

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