Outstanding the speed that this boats can return to its feet after being capsized, even with a lot of sail out
That was a double hit, if the boat had a lot of inertia (a lot of weight for the same RM) and was still capsized when it was hit by the second wave, the story could be other. We can also see clearly the boat going sideways and rotating dissipating with movement the wave energy (look at the clouds) otherwise than with a rolling movement.
Paulo, when I watch the video it appears there is a time edit between the first two waves, so there is no way to tell how long the interval is. Also, when I look at the clouds it looks like the boat is rounding up, I don't see the sideways motion.
Am I correct in thinking you mean that the narrow deep keel allows sideways slipping down the wave face, rather than tripping on a long keel with more surface area? I can see in my mind that if the wave stalls the boat, the deep fin will no longer be providing lift, and might allow side slipping, avoiding being as caught in the wave motion. I just don't see it in the video (where the heck is the camera? It seems to remain vertical when the boat is horizontal. Gimbaled?) I don't think that rounding up is a desirable trait.
This thread has been making me think! Comparing a "flat" bottom modern shape to a "round/V bottom" shape, the flat will tend to orient to the face of the wave it is on, thus quicker to roll and come back.
But that means greater rotational acceleration. That also means greater acceleration of the passenger's bodies and "guts", which means it's more tiring and less pleasant. Further, greater acceleration means that the tall rigging is under greater stress. Greater work hardening and metal fatigue means the continuously greater acceleration increases the risk of rigging failure. This could be another reason older style boats were round/V shaped, they had natural wood spars and natural fiber rigging, both heavier and weaker than today.
Of course, this is a racing boat with a large crew. If cruising one wouldn't have lots of sail up, and would possibly be riding out the storm rather than trying to make the most headway possible, unless near a lee shore.