We'd need to drag you through the water and see how much you lifted at different speeds. And whether there was a definite hump or not. But do post the pics anyway, we can at least debate your theoretical performance
This is very dangerous grond. Each answer could be interpeted in a number of ways. The result could be akin to "is it the red wire or the blue" eitherway the outcome could blow up in your face.
Im very surprised no one has mentioned a cathedral hole!
We were on holibobs in Crete a couple of years ago.Laying on the beach enjoying the lovely view and the only thing breaking the serenity was a speedboat that would occasionally take people out on ringo's,just nodding off dreaming of lovely things when this women who had just finished a trip said in a loud voice "that bloody water went right up my ringpiece"
Sort of spoiled the moment, so I would suggest if you decide to do speed trials with your bottom you block up a certain place or risk a high speed enema.
God forbid any flotsam in the way!