Lift Question
Hey guys,
The Lift vector is technically defined to act perpendicular to the relative airflow (and not perpendicular to the wing's chord line).
However, in a book I am currently reading, the author states that when considering supersonic flight, lift actually acts perpendicular to the wing itself, thus causing "wave drag" at high AOAs.
Does anyone have an explanation as to why this is? I just don't fully understand the difference as to why the definition of lift must change.