Using a .46 2 stk. glow engine will provide you with outstanding flight performance with excellent vertical and plenty of power to perform any IMAC, Pattern and most 3D type maneuvers. Using a .61 or even .91 2 stk. or up to 1.00 4 stk. will provide power like you have never experienced before with a smaller aerobatic scale model. Enough power to execute all the 3D and IMAC maneuvers like a big gas model, with enough Wing Area to handle the weight of the larger engine.