I have a Park Zone J3 Cub. I am fairly new to the hobby and just now am having some significant issues with my plane. I began flying in a fairly confined space and it flew great. Now I have a large open space and it doesnt work! My issue is I charge the battery, go out, put it on full throttle and it seems to be pretty powerful. I throw it and it starts to climb then becomes really unstable! It doesnt have enough power it seems to do anything. I go to climb and it just gets a foot or two off the ground and ends up comming down when I turn. What do I do! Is it the engine, electronics!? Whats wrong! Please help!