what kind of engine should i be using
i have a TT pro46, and it is an awesome engine. very powerful. with the right prop, it may just be enough of an increase to make it faster. i have a SD with a pro46, never flown it, but at idle the thing will move.
i have also seen a telemaster with a .91(i think, it was a 4 stroke, correct me if it is the wrong size) it was bigger than .90, anyway, it never went full throttle.