Difficult to say!
Hi Sam-MAN,
I guess the only way to find out if you are going to be sick is to go for a flight and see what happens, making sure you have a sick bag handy if you think you a likely to be ill.
Interestingly enough, I have never been sick on a boat no matter how rough it gets. Everyone else would be hurling up all over the place and I would be completely fine. The last time I was sick on a commercial passenger aircraft, I was about 8. I grew out of that one very quickly. I guess everyone is different.
With regards to throwing up with an instructor on board, I got the impression that the instructors have seen it many times before. They took the pi$$ out of me occasionally, but it was only a bit of friendly banter. I would rather be chucking up when I have an instructor on board ready and waiting to take the controls at a moments notice, than when I am on my own on a solo.
Maybe someone would like to give us in instructors point of view? I'm sure you guys have got a few stories to tell?