Idea of DR4B alternative

Build a DR4B robot need lots of c-channel, so we were finding new design that use less c-channel, therefore we can build the third robot, then this idea hit my mind some days before. We were wondering whether it works or not.
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Interesting, but you are losing the added height of the middle part of the DR4B that you removed. Also, making something that has to lift so much with chain makes for a significantly less stable lift.

It sounds doable. We had a lift made of 2 chain bars mounted together that worked ok, not great, but certainly usable.

There was a thread on this a few months ago.

https://vexforum.com/t/double-reverse-chain-bar/42323/1

It is very similar idea. The 30 tooth sprocket and 15 tooth tank sprocket is the only pair that is ratio 2:1 I can find.
I made try, the 30 tooth sprocket is too large.

What about 6 and 12 tooth or 12 and 24 tooth sprockets?

Interesting idea, however I would be concerned about gears slipping… which is why a dr4b is used more often. It a), has a little more height than this, b) has a lower chance of slipping, and c), I can’t think of a way to tension this. However, you can try as I have not seen something like this before.