Torque required for hammer to self right?

[Coolspeedbot]

I think we both use 18V drill motors, slightly larger than the standard ones you get from the likes of Argos and a little tougher. You can still use 12V motors on a higher voltage if your radio transmitter has a feature called dual rates. This allows you to set a lower limit for the drive motors so that they don't get the full voltage and risk being burnt out.

I'm thinking of using my Spektrum DX5e, but I don't think it has that dual rates feature.
and as I can't afford to waste money I'll use 12v motors and a 18v battery for my ram bot and use 18v motors and 22.2v battery for my axe bot (most likely a upgrade on the ram bot)