What is the key advantage of planning a multi-crane lift as a "luffing up" operation?

The key advantage of planning a multi-crane lift as a "luffing up" operation is that luffing up enhances the lifting capacity. When cranes are engaged in a luffing up operation, their configuration allows for a better distribution of weight and minimizes potential impacts from dynamic loads. This method uses the cranes' rigging angles more efficiently, resulting in improved performance and stability during the lift. In particular, when lifting heavy or awkward loads, luffing up helps keep the load closer to the cranes, reducing strain and potentially increasing the overall lifting capabilities.

In contrast, other methods such as luffing down might not provide the same benefits regarding lifting capacity, as they can often create additional forces on the load and the equipment involved. Planning operations with safety and efficiency in mind is essential, and luffing up directly supports these goals through optimized lifting techniques. Thus, selecting luffing up as the strategy for multi-crane lifts supports better operational outcomes in terms of capacity and stability.