I'm new to airplanes (coming of choppers) and started out with a mini funtana electric plane. Flys pretty good but everytime I try to do knife edge flight it pitches (toward the landing gear if I remember correctly) and flys in a circle if I could hold it there long enough. Is my elevator out of trim or something? It flys nice and level rightside up and upside down. SO what gives and what can I do to correct this? THANKS!