thats the way they were explained to me... like a fist hitting the water then splaying out like the hand opening. Problem is... what to do with that info other than the interest of knowing which side of the puff you are on. How long do they last? how do you tell? are you just unlucky if you are on the wrong side or can you use it to your advantage somehow?
IMHO the only practical way to really tell is doing some pre-start practice laps (and watching what the Pro's do!).
Although I feel that when going downwind wind strength is probably more important than direction.
