.....O-o-o-o-oh, wa-a-a-ait a second..... i see now!
So it's not the speed that loads the airframe, it's the acceleration! Regardless of speed, i might pull that yoke hard enough to rip off wing or tear off engine. So the engineers don't want me to enter turns at a too fast speed, to make sure i stall before i rip off my wings.
And since a lighter airplane is harder to stall -- that is, stalls at a lower speed -- so they limit me with 93 knots. So that whatever i do in a turn, how ever steep i turn, at that low speed i reach stall condition before i damage airframe.
Allright, i see now what you've been trying to tell me Flare Pilot. What a graceful way to compose a safety belt out of the laws of aerodynamics!
Thank you all again!