Immelman Turn

An Immelmann turn is 1/2 of a loop starting at a low altitude and ending at a high altitude. At the top of the 1/2 loop the plane is inverted and will do a 1/2 roll to the non-inverted attitude. The overall maneuver results in an increase in altitude, a decrease in air speed, and a 180 degree course reversal.A real place would use the elevator to perform the 1/2 loop and then use rudder and ailerons to roll .Obviously a paper airplane can't change its flight controls in flight like a real plane so you will have to use a paper plane that has the following characteristics.1.) a plane that will pitch up with an increased throwing speed. One that will do a loop if thrown hard. Yet when thrown slowly will stay level2.) A plane desigh that has a high wing mount design with a low center of gravity. The natural tendency for a high wing plane if inverted would be to roll to a normal attitude with the heavier fuselage below the wing.Doing an immelman would then rely upon throwing the plane with just the right amount of air speed to do 1/2 of a loop and ending up with a low air speed at the top where gravity would then cause the plane to roll to its non-inverted atitude. The low air speed stops the plane from looping. If too the plane is thrown with too much speed then you will get either a full loop or a "1/2 Cuban Eight". If thrown with not enough speed the plane will pitch up and stall falling nose first towards the ground