Came back from flying field over the weekend.
Saw a glider dropping straight down vertically with little forward speed.
Apparently that was a deep stall landing.
It was used as the landing area of kind of small to land safely.

Wonder what is needed to do a deep stall landing?
Oversized tail? Dihedral wings? etc?
Must it be a glider? Can flying wings do deep stall landing?

Thanks.