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Planing

While the bow and front of the boat are designed to cut through waves, as the water moves toward the rear of the boat the hull becomes flat. 

This allows the Windmill to "skim" on the surface resulting in a burst of speed once she is up to planing speed.  

As described in wikipedia: http://en.wikipedia.org/wiki/Planing_(sailing) ,

"Planing describes the state in which the hull of a waterborne craft is lifting up higher up to the point where it merely skims across 

the water, rather than moving through it. It describes a craft which is predominantly supported by hydrodynamic lift, rather 

than hydrostatic lift (buoyancy). This happens due to the relative motion of the passing water pushing the hull up, 

it rises up with dynamic lift. As the hull rises up the wetted surface becomes smaller, thus reducing 

hydrodynamic drag and making higher speeds achievable."

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