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[Analysis] US experts question THAAD’s ability to intercept North Korean missiles
>Missiles tumbled in the Gulf War due to random lateral forces from rocket motors as they shut down. The motors shut down at high altitudes where the air was so thin that the fins at the back of the missiles could not prevent the tumbling. In effect, these missiles acted in flight like arrows that had no feathers. When fired from a bow, they simply tumble end over end. The low-altitude spiraling phenomena could be made intentionally by modifying the fins at the backend of missiles. Tumbling at high-altitudes happen intentionally with tiny rocket motors attached to the back of the missile that are fired as soon as the rocket’s main motor shuts down.

In addition, when the missiles reenter the atmosphere, they could be affected by aerodynamic forces. As shown in the case of Al Hussein Scud during 1991 Gulf War, if the warhead is too light to force the missile to maintain a stable orientation, lateral aerodynamic lift forces are generated that cause it to move laterally, tracing out a spiraling trajectory. The two scholars pointed out that a target following a spiraling trajectory is the most difficult target to hit.