Similar to a card hitting the spokes of a bicycle, the card is soft enough to knock the dust off the spokes with no damage. What material would be best to impede the propellers to chip off the ice. Assume the flexible rod is machine held. What heavier duty impeller could be used for this? What about the same idea for a helicopter rotor?
I apologize for the multiple questions but they could not stand alone on their own. If it an issue let me know.