All of the scale arfs seem to need help, usually something in the primary structure, landing gear, top wing coming off, engine ripping out or other catostrophic structural failure. All of the big 3 are guilty of this. What suprises me is that nobodys been killed yet as a result (GP PITTS). Yes I know it's s. o. p. to beef up and sometimes re-engineer these 10-20lbs, 100 mph projectiles but some of the times the structural weaknesses are hidden and only come to light after the falure (KMP). Best- World models, T-34, GS P-51, F-82, Happy fly, P-51. H9- Cap. Worst- This is easy, KMP. I've been building arfs for about 30 years.