An concept engine using only the weight of circles ("fuel") to push the cylinder down, and the resistance of springs to push it back up.
It works pretty well, it occasionally backfires but usually resetting it will work and I found it to work marginally well 7/10
tries (not great odds, but it's a concept)
The main problems with this project so far:
1. The size of the fuel needed for it to be heavy enough for the engine to work
2. The slight delay between cycles, caused by the slowness of the feeder system, which is in turn caused by the weight of the circles
3. The occasional reversal of the engine (instead of coming in a circle back to the starting point, it stops and/or rebounds to the other side, causing a reversal in the direction of the drive wheel.
Suggestions/Comments/Ratings welcome
im making a weight engine too, but a little different 
But I'm working on, it seems to provide more power than basic water-wheel style weight engines.
(OK) but in this mode don't think it will work.
