But ,in a C172, no big danger I guess,even if you tumble up..
Really?
I took some lessons in a C172 floatplane a while ago, and on one particularly nice day I asked the instructor if we could just go for a joyride with the wife and a friend in the back. The guy said, mmmm well ok but if we capsize they won't get out alive. Needless to remark we demurred.
But was he right?