The rotor turns at one-third crankshaft speed. The gear ratio is 3:2, but
don't forget that the rotor's center of rotation is itself rotating at
crankshaft speed, so the gear ratio is not an indication (by itself) of the
relative angular speeds of the components. So, when we talk about the rotor
turning at one-third crank speed, it is only the rotation about it's center
that is one-third crank speed. The rotor's center is also rotating about the
crank center at full crank speed.

Jon

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