I would try the tests that PHREAD59 sugguested. First what type of powerplant are you running? It must be set to the correct angles or it will pull the plane in all the wrong directions. Second make sure that you have the wing set at the same angle as the tail plus about 1 degree of up at the L.E. and have a little washout (turn down) at the wind tips. 1 degree of up at the Leading edge of the wing gives it a nice flight angle and the washout keeps tip stalls at a minimum. [8D]