This brings back some memories for me.
Flew the canyon in single and twin cessnas and twin otters many years ago.
Some of the roughest rides I have ever had in my flying career were over the western rim of the canyon on summer afternoons.
It was not unusual to find yourself in a 60 degree bank with the stall warning going of. As for the airsick bags well I lost count but I remember comparing my bag count with that of some of my colleagues. The one with the most bought the beers that evening.
Great days great fun and valuable lessons learnt along the way.