Camera view of chain, shifter, and rear suspension

[Teuobk]

We decided to attach a camera to the floor of our Phoenix F1k.12 and point it backwards at the chain, rear suspension, wing, and Geartronics shift actuator during a testing day today.

Ignoring the COPIOUS amount of tripod grease fling (yeah, yeah...), the result was interesting and perhaps even a bit mesmerizing. The chain in particular is notable for the degree to which it moved/whipped, this despite the chain having been freshly tensioned to the "quarter inch of deflection at the tightest point" spec immediately before this session -- but we might be revising our approach going forward.

https://youtu.be/3jMrrgHQljc

Enjoy!

Jeff

[RussMcB]

I did something similar at a chassis dyno (years ago, video lost).

It was very interesting. Chain was often in "waves".

[S Lathrop]

On the Citation F1000 cars I had a "guide block". It was made from Teflon. I had it mounted about midway between the drive sprocket and the driven sprocket. The block limited the whipping of the chain. On the Citation, the problem is a bit worse because the distance between the 2 sprockets is a bit long. I mounted the oil tank between the engine and the differential.

You might consider such a block to minimize that chain movement.

[10rmotor]

That is pretty cool and kind of what I suspected was going on. Lots of mostly failed attempts to minimize the chain movement and I have to ask whats the harm? This distance between sprockets on a bike is at least as long if not longer and the tension varies based on rear wheel movement up and down, which we obviously don't have.