In the 60s I learned to fly on a Debolt Trainer with rudder and throttle only, no elevator. It would loop and roll with the best of them. Put it in a spiral dive, with rudder, to build up good speed. with enough speed and inertia, When you let go of the rudder, it would go around in a loop. To do a roll, one would put in the same spiral dive. when it pulled out to do a loop, when the nose was pointed up just a bit, give it full rudder and it would do a roll. Had to get the timing just right