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It apparently increases the efficiency and performance of an aircraft, at the penalty of a substantial increase in noise. The gearing necessary adds weight and sacrifices some of the performance benefit, but it was still regarded as an advantage in a few military aircraft.
I know where this is, and it looks really interesting but is very difficult as a photographic subject. The cable does kill it, so that needs to be cloned out I think. There may be a good abstract where the two angled and one vertical line meet in the lower half of the image. I see a square composition around that point, cropping out any sky.