RE: Your biggest
I had two "AHA" opportunities in my life:
1- Futaba U8 manual tells how to setup setup a plane and how to "read" this setup while you see it in flight (CoG position, rigth commands throw and so on).
2- My wife gave me for christmass the "Aerobatics for everyone" dave patick's book. It's old and far from the actual pattern but, who cares? IT'S FULL OF TRICKS AND TEACHeS A LOT!!!!!
Besides the specific learnings i had from those two books, they open my mind to new ways of understanding the plane and its maneuvering.
regards!!
Guille