Hey guys, I had something bouncing around in my head for adding speed to a surfboard was wondering about having an empty space near the tail, bottom side of the board. it would basically be a carved out area that might act as a vacuum to suck water into maybe increasing the speed? Here is a picture... any shapers or like minded people have thought reguarding this? has it already been tried/done? (obviously I am not a shaper and every part of the 3d image is just for conveying the thoughts)