German Air Force

FW 187

This is a Focke Wulf 187 Falke with engines turning.What I find strange in this picture is the bending of the prop blades.I haven't seen that before on pictures wtih blades spinning.Is that a distortion because of shutter time and speed of prop turning or did they bend from the forces involved?On the page I found that photo are more of that plane and they all show that strange effect.Greetz,Brummbar