Is it the apparent wind created by forward momentum? Is it possible to go downwind faster than the wind speed?
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the really fast ones use a hydrofoil type of hull
there are two main types of hulls
a) planing hull (think speed boat going fast it rides up out of the water and hydroplanes) the net result is a small amount of the hull is in the water thus it goes fast.
and b) a displacement hull – think aircraft carrier (and normal sailboats) these have to push their way through the water.
the third type is relatively new the hydrofoil hulls (discussed below) which i think is what you are asking about.
the problem for boat speed is the size of the hull in contact with water as you can tell a high speed boat gets up into planing speeds the surface area in contact with the water reduces so the boat goes faster.. imagine an air craft carrier going that fast
the hydro planing and hydrofoil boats take this to an extream
this site goes into more detai
[https://improvesailing.com/questions/what-are-the-fastest-types-of-sailboat-and-why](https://improvesailing.com/questions/what-are-the-fastest-types-of-sailboat-and-why)
here is a video about sail rocket a really fast boat.
[https://www.youtube.com/watch?v=K3m06731BQY](https://www.youtube.com/watch?v=K3m06731BQY)
one of the problems you have at this speed is cavitation… this is the white frothy air bubbles formed by a propeller when the propeller is turning really fast… in this case the foils are going fast enough to cause cavitation and that cavitation causes drag which slows you down.
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