Operating at the interface between air and water, you want a hull that optimizes for both.
https://www.brighthubengineering.com...ull-technolgy/
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Construction and Working
The design of M hull consists of three main features as follows:
the central displacement section
the planing tunnels
rigid skirts
The central displacement section is what supports the vertical skirts that are attached through out the structure. The design is made in such a way that the skirts are able to capture the hull waves inside the planing tunnel. The incoming bow waves spirals along the planing tunnels and trap the incoming air, forcing it towards the aft.
The planing tunnels also have a slope moving downwards to compress the aerated water for forming the air cushion and reducing the drag. This air cushion increases with the speed of the boat, thus providing additional thrust to the vessel and also reducing the fuel intake.
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