This Dash 8 Q400 is flying at its optimal cruise speed, a hair over mach 0.7. At this speed, the propeller tips are approaching the speed of sound. Any faster and very bad things would start to happen: the propeller blades would experience higher than design forces, it would sound very loud to a listener on the ground, and we'd be making an emergency landing pretty quickly.
Freezing the motion of the propellers was only possible at very high shutter speeds. This was taken at 1/4000s.
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