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Walk-around of the Loon's nose propeller.

Picture 2 of 3.

Part of the guidance system, the air stream would turn the propeller as the Loon flew, operating a mechanism which counted the number of propeller rotations. Once the counter hit the number of rotations programmed by the launching crew—and therefore had flown the desired range—the auto-pilot would send the missile into a steep dive toward its target.