Attach a railroad spike to a helium balloon. The balloon rises, carrying its cargo up and away by wind. As the balloon ascends, air pressure decreases and the balloon expands, and at some point, bursts. Then, the spike plunges to the ground from high altitude, killing the person unlucky enough to be directly below it.
Somehow avoid the balloon remnant from acting like a drag parachute.
Accurate model of wind.
This seems to be an incredibly simple weapon of terror (not too effective as a weapon of killing). It could also easily be deployed en masse. Inspired by the WWII Japanese balloon bomb attack against the U.S west coast.
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