Effective Relative Airflow


Well-Known Member
I just wanted to make sure I understand this in reference to induced drag, and the effect it has on tilting the lift vector rearward. Is it the angle of downwash in relation to relative airflow that determines the angle in which the lift vector shifts rearward? In a diagram I looked at, it appeared that the angle between the downwash and the relative airflow is equal to the angle between the relative airflow and the effective relative airflow, which also equals the angle between the original vertical lift vector and the resultant lift vector. Is this correct, or can someone provide an understandable explanation?
According to Aerodynamics for Naval Aviators, you are correct. Seeger 66. It essentially said that the effective relative wind is angled due to the induced down wash. The lift vector is tilted rearward through an angle corresponding to the induced down wash angle. In other words, an increase in induced drag directly corresponds to a reduction in effective lift. I'm no engineer and I'm sure there are other variables, but that's what I read out of it.