I had a blade on my fan just bend and tear up the radiator. Never seen that happen before. I've got plenty of clearance and the motor is tied down.
Quote PwrWgnDrvr
....It is obvious that the blade deflected forward from the force of moving the air, then hit the rad, because u said: "it let loose while revving the engine". Next time, keep it under 10,000 rpm
Looking at the one full frontal photo, it appears that there is paint chipping on two other blades, at or near the rivets, indicating that those blades were also under stress and attempting to flex?