While the little Oscillating Cylinder Engine project cleaned up nicely with a lightenend flywheel and milled upright, it still lacked a little charisma.

I made a quickie cylinder out of a scrap of aluminum stock I had.  It seemed to add just a little more 'finished' flavor.

It runs the same as the square cylinder version;

it's just more fun to watch.

Of course, after that, we made the variable-angle

twin-cylinder version...