this is funny from that website
Don't fly when someone with a plane identical to yours is already flying. ARFs and yellow Cubs are particularly susceptible to this problem. Several years ago two fliers were flying with identical ARFs. When one of the models landed, both modelers went out to get the plane. Much to the entertainment of the folks in the pits, one modeler discovered the his plane had crashed out in the field 5 minutes previously because he had lost track of which airplane was his, and he was "flying" the wrong one.