The Slo-v Just needs the upgraded 7 cell nimh battery and it flies fine, I actually have the slo-v and through a lipo on it and kept everything else.. very easy fix and is plenty strong now, will not burn out the Esc or motor and can do continued loops and climb very easy.. I do agree though the STOCK set up with the 6 cell nimh is WAYYY underpowered, flyable though