What action does a WIG craft utilize to achieve its multi-modal functionality?

A WIG (Wing-in-Ground) craft achieves its multi-modal functionality through the surface-effect action. This principle utilizes the ground effect generated when the craft flies close to the water's surface, allowing it to achieve lift and reduce drag. When operating in this mode, the craft can travel over the water's surface while benefiting from enhanced aerodynamic efficiency, which is crucial for maintaining high speeds and stability.

The surface-effect action can be advantageous for various modes of operation, enabling the craft to function effectively as both an aircraft and a marine vessel. This unique capability makes WIG crafts versatile for applications in transportation and potentially search and rescue operations, amongst others. Understanding this mechanism is key for operating or assessing the operational capabilities of such craft effectively.