I will agree that the Irvine and MVVS and all that are fine engines, but my feeling is these are all much more power than the Dazzler needs. A 40 size will tear up the sky pretty good on a Dazzler. For someone accustomed to gas powered giant scale, I would think a ball bearing 40 would be all the power you'd want, and too much would be like juggling wildcats. I flew my Dazzler on a TT 36 Pro w/ Ultrathrust muffler and never wished for more power.