Which principle governs how load distribution affects hull strength and trim?

• A. The total weight regardless of position does not affect trim.
• B. The distribution of weight relative to the hull’s centerline; improper distribution can cause excessive trim and stress.
• C. Wind load on deck primarily determines trim.
• D. Buoyancy distribution equals weight distribution.

Answer: (B)

Weight distribution relative to the hull’s centerline and along the length determines how the boat sits in the water. When heavy items are placed forward or aft, or off the centerline, the buoyant forces try to balance the weight, but the result is a trim change (bow up or down) and increased bending stresses at the hull structure where the load creates the largest moment. Properly distributed weight keeps trim within designed limits and spreads stresses more evenly across frames and the keel.

Keep in mind that simply having a lot of total weight doesn’t guarantee neutral trim, and wind on deck isn’t the primary factor setting trim. Buoyancy responds to submerged shape, not exactly to weight distribution, so overall trim is the result of how weight is placed relative to the centerline and along the length, balancing with buoyancy.