For those who actually give a rat's ass about aerobatics - go to Kirby Chandliss' site - Red Bull Co pilot page - watch and listen to the info and demos of why the plane is like it is .
I really can't understand why those who profess to have an extensive formal background in why things fly - can't understand that the "fixes" on many full scale planes --simply do not apply to these small slow models .
The business of the leading edge shape - sharp for snap -rounded for smooth flying -is simply not applicable - look at the best full scale aerobatic airfoils -if you still doubt this
One more time -for good flying models of this size --it is ALL wingloading and power --everything else is compromise .
Some wag once said---
Don't let education get in the way of garnering knowledge.
Don't get upset - just go take a look
If the info provided on Chandless'web page is of no help in your understanding aerobatics - I will be surprised