When looking at the engine sizes you guys are talking about I'm a little confused on what plane you are really talking about. Do you mean the Model Tech Magic 300 or the Model Tech Magic Formula 3D??? The Magic 300 I ran an OS 50SX and on the Magic Formula 3D I have a Super Tigre G90 on the business end. Both planes are off the ground in less than 10 feet with a little head wind.