Increasing the number of parts supporting the load does what to the tension on the haul line?

Increasing the number of parts supporting the load decreases the tension on the haul line due to the mechanical advantage gained in the rigging system. When multiple parts are used to support a load, the force needed to lift or move that load is effectively distributed across those parts.

For example, if you are using a block and tackle system, each additional pulley reduces the amount of force required to lift the load. This distribution means that the tension in the haul line becomes lower compared to what it would be if fewer parts were used. The overall system becomes more efficient, allowing the rigging team to lift heavier loads with less force, thus decreasing the tension necessary on the haul line.

As a result, using more parts not only makes lifting easier but also minimizes the strain on the equipment and the potential for failure, highlighting the importance of mechanical advantage in rigging operations.