Check the obvious first. I maidened my brothers trke trainer and thought the same thing, this thing doesn't want to fly. It just kept nosing over on take off. A friend at the field took a look and the elevator was reversed. This forced the nose over the more elevator i applied. If you haven't already checked it, check it. Pull back elevator goes up, push forward elevator goes down. I know it sounds too basic but sometimes these things get over looked.