Following discussion here, I am still confused about the difference between AoI and AoA. As I read in many references and watched in many YouTube videos especially this one:
1). AoI is tje angle between the longitudinal axis and the chordline as per design/manufacture. It says normally AoI designed/manufactured is six degrees. AoI remains constant as it is fixed relative to the fuselage.
2). AoA is the angle between the chordline and the RELATIVE AIRFLOW. AoA changes in flight.
My confusion is with the meaning of the RELATIVE AIRFLOW. This phrase confuses me. In my opinion, airflow produced by the propeller or the turbines flows parallel to the longitudinal axis, or at least it has fixed angle, also as per designed too.
To avoid a repetitive question, I want to give this situation. 1). During take off of an airplane, from the airplane start moving until it left the ground, what is the RELATIVE AIRFLOW? 2). After the airplane takes off and during climb, what is the RELATIVE AIRFLOW? 3). During level flight (cruise with constant altitude), what is the RELATIVE AIRFLOW? 4). During approach to land until touching ground, what is the RELATIVE AIRFLOW?
What is actually that AIRFLOW?
I apologize if there are too many questions. It is actually just one. Just to make sure that you will not confuse to read and I will not get confused to read your explanation as product of unclear question.
Before I post this question, I have search if someone have posted previously. But I didn't find the same question.