Jim Macklin wrote
Flap extension reduces the stalling speed, often only a few
knots, but lift increases as does drag. The airplane will
balloon and slow very fast, the extra distance and altitude
gained is only a few feet, but if all you need is to clear a
5 foot cattle fence or a 10 foot wide ditch, that is a
technique that is useful.

Can't create energy out of thin air Jim. You would clear the
same 5 foot fence just by increasing the angle of attack and
in both cases, glide a shorter distance if you were at best
L/D to start with.

Bob Moore