For every sheave a rope passes through, what percentage of friction is typically added to the weight applied to the rope?

When a rope passes over a sheave, it experiences friction due to the contact between the rope and the sheave. This friction leads to an increase in the effective load that the rope must bear, which is often expressed as a percentage. Generally, for every sheave that a rope passes through, an additional 10% of the load is added due to this friction.

This percentage accounts for the energy lost in the system and reflects the inefficiencies when using pulleys or sheaves in rigging applications. Understanding these frictional losses is crucial in rigging to ensure that the lifted load is manageable and within the safe operating limits of the rigging equipment. Knowledge of this principle helps riggers calculate the required adjustments when planning lifts or moves, ensuring safety and efficiency in operations.