The best thing to do when using multiple modles with a single radio is to have a cheat sheet. This can be on the plane or on the radio. The cheat sheet will be a list on the radio of what modle the planes are or it would be as simple as a number on the plane telling you what modle it is. This way you won't try to fly a modle with the wrong servos reversed or the ATV set wrong or the trims set wrong. Any of those thing could result in an instant crash just because you picked the wrong modle memory. This is one of the best features of the Spektrum DX-7. It won't let you fly a plane if the wrong modle memory is selected.