Question 488 Deck General

The correct answer is C) load radius. The load chart on a ship's crane relates the allowable load to the combination of the boom length and the load radius. The load radius is the horizontal distance from the center of rotation of the crane's boom to the load being lifted. This is a critical factor in determining the maximum allowable load, as the longer the load radius, the less capacity the crane has to safely lift the load. The other answer choices are incorrect because they do not directly determine the allowable load on the crane. Boom strength and cable strength are important factors, but they are not the primary relationship shown on the load chart. Winch speed is not a factor in the load chart, as it relates more to the crane's operational capabilities rather than its load limits.