Effective Relative Airflow

[troopernflight]

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?

 

[ElihuSmails]

http://www.faa.gov/regulations_policies/handbooks_manuals/aviation/media/00-80T-80.pdf
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.

 

[troopernflight]

Roger that. I figured it was probably in that manual somewhere. I appreciate it.

 

[shdw]

that's what I read out of it.

You read it right Sir, "Since the average relative wind is inclined downward, the section lift is inclined aft, by the same amount--the induced angle of attack." My emphasis added.