How is the performance with the 48 surpass? Folks say that a .56 4-stroke is enough. I already have a .72 which I can use, but if a .56 is enough, then I can leave the .72 on the knife. But, then I may want some extra umph. The other concern is the torque. A .72 may make the take-off more "interesting" if you know what I mean.

Does OS make a .48 surpass? Or did you mean .52?