that ground effect works best on a wing of low aspect ratio. My takeaway is that
it is because the extended chord line makes a more concentrated area of
"capture"; there is less loss of compressive force, since the wing is not
skinny, but traps more air, for a longer time.
No.
Low aspect ratio results in greater downwash, due to increased vortex strength. How on earth does a wing "trap" air????????
I think it's time to avoid further comments here in case some ill-informed moderator bans me!