Wow. Dr Smiles (dentist I believe - wonderful profession BTW) you totally crack me up! You have got to be writting this stuff just to egg us engineers on, because I can't stop laughing. That said, I have to take the bait - silly me.
Please, please go back to your Stress and Strain books from freshman year. Bending (or perhaps flexing is a better word really) is absolutely necessary of metal structures or they would fail imminently. Ever seen a helicopter blade moving? They flap like a birds wing when moving. Your AL prop also flexes as it moves through the turbulent air too. Take a stobe light to it. Ever seen an engine crank flex while in motion? They vibrate like a sonic toothbrush. Its down right scary, but thank God they do. As long as the modulus of bending is NOT exceeded, all is well (though in truth, AL has a fatigue life based on number of flexes as well as its modulus; wood and iron compounds, modulus only). But you and your body just can't do the damage you are insinuating. Well, unless you are really Clark Kent, and youre just toying with us mear humans. And oh by the way, there is no such thing as centrifugal force, only centripetal, but that's another entirely different arguement.
Please please, stop with this. Youre killing me.