When we roll or yaw an aircraft, there is secondary effects accompany. Pilots should learn about those secondary effects in order to better control the aircraft.
The secondary effect of ROLL is YAW.
Let's say we are to roll to right as below example. The lift vector is inclined and can no longer support the weight vector. The aircraft loses height and begins to slide-slip towards the direction of roll. Airflow hitting the right side of the fuselage. This airflow acting on the right side of the vertical stabilizer and rudder pushes the tail to the left. The head of the aircraft will therefore yaw to right due to weather-cocking.
The secondary effect of YAW is ROLL.
Let's take below example to yaw left. The right wing travels a greater distance at a higher speed than the left wing. Thus it generates more lift than the left wing resulting to a roll to the left.
Let's take below example to yaw left. The right wing travels a greater distance at a higher speed than the left wing. Thus it generates more lift than the left wing resulting to a roll to the left.
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