In aircraft design and aerodynamics, the vertical axis is also known as the “yaw axis,” and it primarily governs an aircraft’s yawing motion, which involves turning or changing its heading. Roll motion, on the other hand, occurs about the longitudinal axis (the roll axis).Positive roll represents the rotation of the aircraft about its longitudinal axis in the positive or right-roll direction.
This motion is controlled primarily by the ailerons and is crucial for banking or rolling the aircraft during turns.The formula for the positive roll rate (p) about the longitudinal axis can be defined as follows:
- Positive Roll Rate (p) is the rate of rotation about the longitudinal axis, measured in radians per second (rad/s).
- Δφ represents the change in roll angle (bank angle) during the time interval.
- Δt is the time interval over which the change in roll angle occurs, measured in seconds (s).