There are many serious accidents such as aground or ship's broken that is caused by the anchor dragging and often bring many loss of crew when ships are anchoring in a heavy storm. The captain has to decide whether the anchoring is suitable or not in such condition. For this purpose, it is required for him to predict the maximum mooring force properly and confirm that the predicted force is enough for the anchoring. In order to realize such prediction, the authors carried out the experiments using several ship models and clarified the characteristics of mooring forces for various wind force and waves. Then the simple prediction methods of the maximum mooring force as well as the average mooring force have been proposed here based on the experimental and theoretical approaches. The predicted horizontal mooring force agrees well the experimental results.

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