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Calculates sheave efficiency in a rope reeving arrangement based on Euler-Eytelwein equation
Friction coefficient of sheave bearing
$$ \mu = 0.005 \:
$$
Wrap angle
$$ \theta = 3.1415 \:
rad $$
Sheave efficiency
$$ \eta_{sheave} = {1 \over \left({ e ^ \left({ \mu \cdot \theta }\right) }\right)} $$