What control inputs are needed for an accelerated spin?

An accelerated spin is characterized by a rapid rotational motion around the aircraft's vertical axis, which is typically entered into from a stall condition while maintaining a high angle of attack. To induce an accelerated spin, the control inputs need to allow the aircraft to remain in this stalled condition while maximizing the rate of rotation.

When the stick is positioned anywhere other than full aft, it enables the pilot to establish and maintain a certain level of aileron control or rudder authority. This positioning helps to keep the aircraft balanced in the spin while allowing it to rotate more rapidly, which is essential for achieving the accelerated aspect of the spin.

In contrast, using full aft stick would further exacerbate the stall condition and could potentially move the aircraft into a flat spin, which is not the intended result when seeking to perform an accelerated spin. Similarly, utilizing a stick forward of neutral is not effective as it would typically reduce the angle of attack and would counteract the conditions necessary for a spin. Anti-spin rudder inputs would also contradict the goal of accelerating the spin, as they would generate forces aimed at regaining control rather than enhancing the spin rate.

Thus, keeping the stick out of the full aft position while still engaging the necessary rudder inputs is the correct