How to model the boat sailing on the water surface with springs/ connectors?

Hi, every body,

       I want to model the boat sailing on the water surface in Abaqus with Explicit solver. To consider the buoyancy, I think of  a way of setting springs on the reference point of the boat. In detail, When the boat is lifted up, the spring on the vertical direction will pull the boat back. When the prow of the boat rises and the stern drops the rotating spring will pull them back to  the initial horizontal  direction. However the question is the spring is not available in explicit solver. So I turned to using the connectors. But I am not sure how the connectors are used in this case. Can any one give me some advises? I will be grateful for any suggestions!
Thank you.