As Bill said you need to make the turns nice and slowly. The training wing is polyhedral and should be quite happy flying level but absolutely will not turn sharply. (Well, you might be able to force it too, but it will not be happy!)
If it has an elevator you will have to pull back a bit during turns or it will drop, otherwise, the steeper the turn, the faster it will sink. I think the Firebird has some kind of weird control system that does that for you - it might need to be adjusted.