I don't know whether they don't recognize the
sink or just can't translate the recognition into action.
Thoughts:
1) A good demo on your part every 5 landings or so.
2) Power off stalls at least teaches the muscles the right motion.
Point out the similarity.
3) Fly down the runway a foot or so off the ground with power to
teach them where the ground is. OK if the mains touch occasionally.
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