the saito 52 will fly it...vertical will suffer. if he's set on a FS and wants 3D power go with the saito 72. don't wory too much about CG, the saito 52/72FS engines weight the same or less than a BB.46.for ease of install and cost saving go with the magnum .52XLS, I have it on my ME and it's a freaking rocket!!!! blasts out of hover even at 4 lb 14 oz(dry). take a look at the video in the HOT KNIFE review on RCU, the full power take off and vertical acceleration is dam near the same on the ME with the .52XLS



John