Im using a sabertooth 12amp, seems to work ok. and Haha, I just weighed the bear components of rocky (no frame mounts or pullys) and it weighs 1.5kg... I need to either need to use some untigravity technology, or lighten every thing, probably have to swap out half of the components, probably have to switch to a brushless spinner motor as that would save about 300 grams, and then lighten the blade. Shame, That brushed motor was seriously meaty and reliable. And the disk would become even less balanced.