So i got this problem taking off where the plane would 'bump' (like hitting an invisible rock or something) on the runway when reaching certain speed making it impossible to takeoff. It occurs on RHS's Tu-95, TeTeTe3's Su-35 and PAK FA (forgot the author's name) but vanilla aircrafts doesn't seem to be affected including Jets DLC planes. I dont think its because of the runway terrain because i tried it on altis, stratis,and virtual garage all with the same result. Does anybody have the same issue or.. is it just me?   P.S i dont know if this should go to mods category because the problem mainly occured on modded planes.   Thanks guys, i appreciate every help