i have a brushless 4100kv with gearbox never had problems and hangs on the prop at 50% throttle.......
yes im running the 4100kv and gearbox the 11x8 is like one size down from 12x6 never used the 12x6 and never will because the plane really does everything with the 11x8 ...i feel if i try the 12x6 i might crash or motor might get to hot ...i have 2 12x6 props never used ....even when i was flying the tribute around i never used the 12x6 ........(your right on with the setup your using the outrunners ,,need smaller props so that 10x whatever will be perfect for your setup )......
i have a 22m 1000kv outrunner you have to use rubber band to put prop on ..lol
[link=http://www.rcgroups.com/forums/attachment.php?attachmentid=568595]yak 54f prop hangs on gearbox[/link]
what would be cool for this plane and have huge power would be the park400 brushless with gearbox (its used on mini edge (heavier plane) 400with gearbox would be killer35 amp esc and ......2100 li po.........dont know if this is too much power and wings rip apart if it happens then sorry
[X(][X(][X(][>:]