Lend me your brains

Sir, I refer you to my previous point, and provenrad's comment.

Essentially what we're saying is that tuning chain length is not as easy as it sounds if you want to avoid having a slack chain (and you* do* want to avoid this).

The maths for matching ratios is fairly simple, hopefully I can get the chain lengths within reason.

If I did use a tensioner, I would of course only have to use one, the non-drive side would be set up taught and untensioned as you would any fixed drive chain (so no need for tensioning) - the drive side would then be made the slack side and tensioned.

But . . . I so think I can set this up with acceptable (and safe) tolerances without tensioners. (??)

By the way, this does sound like a fun idea and should be fairly cheap to try out, even if it doesn't work. I'm not trying to sound negative, hope my comments don't come across that way!

No! This thread is for exactly that, come up with an idea, float it out on the water and invite people to sink it, if it sinks, refine it.

So throw your stones, that's the point. (just don't aim for my nuts)