Prop sizes..
I agree crash. Many times it seams people just accept a way a plane flies and chalk it up to "you have to land it this way" or "you don't know how to land it" sometimes palying with different parameters makes a HUGE difference. I am pretty happy now with what I have learned, and I am sure it will make a difference in my modeling in the future. or as my other half say's. "oh great! more excuses for you to stay out at the field longer" *laugh*
Cheers,
FW