Why do wing-tip vortices cause an induced angle of attack upstream? | pressku.com

My mobility is nan following. Wing-tip vortices induce a downward travel connected nan guidelines broadside of nan wing. So, if this induction happens astatine nan wing, and these vortices are past shed downstream, why is location a downward travel constituent astatine nan starring separator of nan wing? Shouldn't nan travel travel consecutive and crook downward astatine nan rear of nan wing? This way, nan helping conscionable sees nan consecutive airflow, arsenic demonstrated below, causing nary induced drag.

My conjecture is, for a subsonic flow, nan downward travel "information" is transmitted upstream by pressure, causing nan travel to already person a downward constituent erstwhile it hits nan starring edge, contempt nan downwash taking spot later on.

Thanks