Last night I told you about an incident involving a Cessna 172. Today I have a picture of one propeller tip so you can see what happens when a spinning prop strikes pavement. This is one of the "best" curls I've seen in a prop, though I'll have to admit to not seeing all that many.
When running, in this position the blade would have been moving downward. The forward movement of the airplane tends to cause the tips to bend aft. Successive strikes change the initial bend into a curl, the rotation of the prop gives it a characteristic spiral. It is a very interesting, if expensive and disturbing, shape.
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