Deathly Hallows - FW - No-IP-Rocs

[Deathly Hallows]

I understand and agree the greater the mass and further from the pivot the greater the impact.

Found a nice animated gif here:

https://en.m.wikipedia.org/wiki/File...a_examples.gif

I want it to be able to fight, but I'm willing to compromise for a bit of style over performance.
First I'll get the motor control sorted then investigate if my idea is viable. Really appreciate your input. If you have a link to a calculator id appreciate it. I know one was posted here before but I can't find it now.

FYI The reason I was looking at spur gears is the bad experience I had with chains on the drive for Alligrator. Always jumping off.