(maybe it's in the forums years ago but) I just discovered that with xml editting you can make the throttle range smaller, so the 100% of the throtteling you do while flying will be, for examble if you set the max throttle to 0.1, the 10% percent of the power you give to the engine, and this being what makes the flame we can put the engine power on 10 so it's proportionally compensates the x10 lower max throttle we gave to the engine, and boom you have an engine with almost no flame that can be covered with other things. hope it's understood because i don't speak english beri wel