Try the "Dazzler" as it is the same plane with more side area. Two things produce knife edge flight: 1. Side area 2. Speed (engine). It is doubtful if a .46 will give you this in this size and weight plane. I have flown both these planes. I'm currently flying a Hanger 9 Pizazz which is more capable than either of the other mentioned planes. I'm using a .46 and don't have unlimited vertical but can get a knife edge loop. I'm planning on installing a .53 (2 stroke) at the same weight. Some are using up to a .70/ 4 Stroke for truly unlimited vertical. Bill