Stabilator Functions (SCALP) NOT a function?

Stabilator Functions (SCALP) NOT a function?

• A. Drag Reduction
• B. Streamlines
• C. Lateral Sideslip
• D. Angle Of Incidence

Answer: (A)

In helicopter aerodynamics, the stabilator is used to trim and stabilize the aircraft by changing the tail surface’s angle of incidence to affect pitch, influence how the airflow past the tail remains smooth, and contribute to directional stability. Among the listed effects, the stabilator actively changes the tail’s angle of incidence to set the pitch attitude, and this adjustment helps maintain smooth streamlines of airflow around the tail and tailplane, which aligns with the idea of keeping the flow attached and well-behaved. It also plays a role in counteracting lateral sideslip by altering tail lift to help keep the fuselage aligned with the flight path. Drag reduction, however, is not a discrete, deliberate function of the stabilator. It’s more of a downstream result that can occur when the tail’s incidence is trimmed to minimize adverse flow or separation, rather than a primary control purpose of the stabilator itself. That’s why drag reduction is not considered a stabilator function, making it the correct choice for the NOT a function item.

In helicopter aerodynamics, the stabilator is used to trim and stabilize the aircraft by changing the tail surface’s angle of incidence to affect pitch, influence how the airflow past the tail remains smooth, and contribute to directional stability. Among the listed effects, the stabilator actively changes the tail’s angle of incidence to set the pitch attitude, and this adjustment helps maintain smooth streamlines of airflow around the tail and tailplane, which aligns with the idea of keeping the flow attached and well-behaved. It also plays a role in counteracting lateral sideslip by altering tail lift to help keep the fuselage aligned with the flight path.

Drag reduction, however, is not a discrete, deliberate function of the stabilator. It’s more of a downstream result that can occur when the tail’s incidence is trimmed to minimize adverse flow or separation, rather than a primary control purpose of the stabilator itself. That’s why drag reduction is not considered a stabilator function, making it the correct choice for the NOT a function item.