Puzzle: Warped Turboprop Propeller Blades

I recently took these two picture from the window of a Dash-10 Turboprop. Camera: HTC Desire HD. I can assure that the blades looked normal to the naked eye. Any explanation on the observed warping of the propeller blades in the pictures?

Puzzle solved:

Oscar Gemperle sent me the solution as explained in another blog:
http://blog.alexbeutel.com/135/image-aliasing-of-plane-propellers-in-photos-and-video/

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One Response to Puzzle: Warped Turboprop Propeller Blades

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