The Pulse XT 40 with an OS.55AX will fly just fine but is overkill. I have been flying mine for 2 years with the OS.46AX with an 11x6 APC and it performs great and just sips fuel. You shouldn't need the extra power of the.55 in this airframe. This plane is fast and a great plane to fly. Save the .55AX and use it in a Funtana or Showtime 50.