Friend of mine recalled a flight o'er the North Sea in a t-prop a few years ago. Seatbelt light went on, a few pax clipped in, PA crackles "ladies and gentlem..." at which point there was the resonating 'boom' of an airpocket, with the loss of a few dozen feet. He said you couldn't hear the rest of the announcement, as the sound of buckles fastening sounded like a machine gun.
My own experience in the lowly 152 is that light = moderate, moderate = better wear a hard hat, severe = grown man screaming, and anyone that tells you they survived "flying" a spancan through 'extreme' is not the kind of person who should meet your sister.
A belated Merry Christmas to all.
