Which aircraft uses spoilers as the sole device for roll control?

The B-52 uses spoilers as the primary means of roll control, distinguishing it from many other aircraft that typically use ailerons. In the B-52's design, spoilers alter the aerodynamic forces on the wings, providing roll control without relying on traditional aileron movement. This system improves the aircraft's control characteristics, especially at slow speeds or during landing, where effective roll control can be crucial.

In contrast, the C-130J employs a combination of ailerons and spoilers for roll control, leveraging both systems for better handling. The AH-64 Apache utilizes cyclic and tail rotor inputs for roll control, focusing on helicopter-specific flight dynamics. The F-16 Fighting Falcon employs ailerons and slats, allowing it to achieve agile maneuvers but not solely relying on spoilers. Therefore, the B-52 stands out in this context due to its unique reliance on spoilers alone for roll control.