I was an RC aircraft beginner 12 years ago, when I decided to give up, because I didn't have proper consent from a loving wife. I no longer have the loving wife so i retrieved my Sturdy Birdy II from the basement, bought some new batteries and fuel, and hand launched it in a cow pasture. Made a couple of turns and cut the throttle, because I couldn't get it trimmed. Made a hard landing and broke the prop, but no other damage.I

My question: How do you know whether it needs rudder trim or aileron trim when it's in the air? I don't remember, and don't know if I ever knew.
Thanks