I've recently finished building a Great Planes Ultimate 40. I've flown it twice and it does some weird stuff. When I try to make a right turn, as soon as I apply elevator it rolls left and pops up. I've only made right turns with it and therefore I don't know what it would do in a left turn situation. I don't know what the problem is...I was hoping that someone out there could give me some advice as to how to solve the problem.