My understanding is that planes don't fly directly upside down, and they angle the wing slightly to make a kinda-sorta-airfoil. How helicopters can turn direct

My understanding is that planes don't fly directly upside down, and they angle the wing slightly to make a kinda-sorta-airfoil. How helicopters can turn directly upside down, and fly that way[1], without reversing the direction of their props, that I don't get. (Thinking about it now, I think it turns from a helicopter to a hovercraft? Eg, this is a ground effect?) [1] https://www.youtube.com/watch?v=gdDESYBdeSE https://www.youtube.com/watch?v=gdDESYBdeSE Also, tangentially, Magnus effect planes are a thing: https://www.youtube.com/watch?v=K6geOms33Dk https://www.youtube.com/watch?v=K6geOms33Dk