Mike wrote:
> Clearly, the smoother the finish, the faster the boat is going to be.

Yes it seems that's the case for boats.

But I've seen in other areas that a rough surface might be an
advantage. Intake ports in cylinder heads. Or the classic example of
golf balls.

I guess it depends on the fluid, speed, size e.t.c. The reynolds number.

Sea slide looks interesting, especially if it lasts.