Tunnel-maker
I came up with this idea after seeing Joebot360's cool-looking 8-Cylinder Radial Engine, and thinking it would be nice to build something around it (other than a plane).
When turning the power on, the front 9 cutters (gears) are rotating quickly (as well as the engine's pistons), and the machine is advancing forward very slowly.
I don't think Lego tracks are actually meant to be operated so slowly, because at that speed you can notice the effect of the wheels going in and out the link tread holes, resulting in a slight overall up-and-down motion.
The track support structure is largely based on that of 42097, because I don't like to reinvent the wheel (or in this case, the track...)
Note that this is by no means an accurate representation of a real tunnel-maker. I don't think they have radial engines, and I don't think they have tracks either. But it's nevertheless a fun model I believe.
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