Well 3D, It does not depend on how hard you land the airplane. If you land it at all its going to delaminate sometime soon. An sense you must not have this model I will go ahead an fill you in on something....It comes with carbon fiber gear legs, you buy the aluminum gear after the carbon fiber gear starts delaminating....... An if you take a real good look an the Hanger 9 27% Extra 260 you will see nowhere on the box or on the plane does it say.......... Trainer ......I won't be bliping anything. Need not give me a how to land speech. If I needed that I would still be flyin something that said ....TRAINER....