pic: Frog Force 503 Omnitank Drivetrain (rAC)

[Kevin Ainsworth]

Design looks great, we have a group of kids that want to prototype one of these chassis as well. Keep posting your results as you go so we can learn with you.

Chain stretches over time, it's going to happen.
You can also use pre-stretched chain like the type from US Tsubaki.
Part Number RS25, it's shiny silver, not black like other chain.
We run this chain exclusively and it stretches much less.
And #25 chain is fine if you keep your sprockets aligned.