I had an RCM 40 (Global) with a TT Pro-46 and it could do outside loops. Also flew inverted very well. Immelmans, split esses, no problem. Trainers are, and rightly so, set up nose heavy. If you feel extremely brave begin moving the center-of-gravity back 1/8" at a time (but never more than 3/8" or so total). The RCM 40 had a slightly less than flat-bottomed airfoil and I also had it set at high throws with flaperons so I could dial the ailerons up as slightly spoiled (?) as Montague suggested. Has the effect of changing the datum line of the chord and slightly reducing wing area/lift. Most trainers benefit more from setting the ailerons as spoilers instead of flaps if you decide to bother with that feature at all. But get it figured out "straight" for several months before toying with mid-flight adjustments. Anything that may cause you to look away from the model (like finding the flap knob) is a bad idea early on.