In what applications are spoilers primarily used?

Spoilers are primarily utilized in aircraft for roll control and speed braking. In flight dynamics, spoilers are devices that can disrupt airflow over the wing, which reduces lift and increases drag. This dual functionality is crucial for several reasons.

When it comes to roll control, spoilers can be deployed on one wing to create a differential in lift between the two wings. This differential allows the aircraft to roll toward the side where the spoiler is deployed, enabling pilots to make more controlled turns and maintain stable flight maneuvers.

Additionally, spoilers act as speed brakes during descent or when landing. By increasing drag and reducing lift when deployed, they help to slow down the aircraft more effectively. This capability allows pilots to manage their speed and descents more efficiently, especially during critical phases of flight like landing.

The other options do not accurately reflect the primary uses of spoilers. For instance, while spoilers can have indirect effects on ascent performance and altitude maintenance, their primary functions are more specifically related to roll control and drag increase.