Aaaah! The power of vortices. Thank you
John T, Vessbot, tdracer, megan and others for a really 'adult' discussion on lift. Well informed, erudite and slayers of myths!!
Insects are rather good at it too:-
https://www.nature.com/articles/521S64a
https://arxiv.org/pdf/1803.07330.pdf
Mother Nature had it sorted millions of years ago.