Note that the flywheel is made from a Microsoft software CD.  This is
the first occasion in recorded history where Microsoft software has done
anything useful - even if it's just going in circles.  Even the bloat of
MS wasn't sufficient, though, and I had to add some pocket change to the
disk to get enough inertia.
Don't ask me for plans for this engine.  There aren't any because I
built it from a mental image I had and, no, I won't take it apart and
draw plans from the pieces.