What aspect of an aircraft increases during spiral stability opposition?

In the context of spiral stability, oscillatory stability refers to the aircraft's ability to resist and dampen oscillations that may occur during a spiraling flight path. When an aircraft experiences a disturbance, such as a change in altitude or heading, the aerodynamic forces acting on it can lead to an uncoordinated flight resulting in a spiral descent. With increased opposition to this instability—often due to factors like increased control surface deflection or enhanced aerodynamics—the aircraft can demonstrate a greater ability to stabilize itself during these oscillations.

As the spiraling motion develops, a correctly designed aircraft will exhibit characteristics that enable it to return to stable flight conditions, indicating improved oscillatory stability. This feature is crucial for safe aviation operations, especially when considering the handling and recovery from unexpected maneuvers. The focus on oscillatory stability is particularly relevant in preventing excessive rolling or yawing that can characterize a spiral, thus ensuring the safety and control of the aircraft in such scenarios.