Well guys I just got back from the hobby store and I got the edge 540. why may ask because the box that the extra was in was damaged in shipping and to me and the store owner. he said he could order me another one but made me a deal on the edge so I came out only 10.00 dollers more for the edge. Now I know most of you will say that the tower .75 will be low on power for this plane but there is an up side to that. first I have not yet leaned all the 3D stuff and if I know my wife she may feel bad for me and let me get a bigger engine