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^What he said, but to clarify a bit, the gear ratio is tied directly to rotor/housing geometry. So for the Mazda design, which is a 3 sided rotor, it has to be a 1:3 ratio - rotor turns 1/3 for every full revolution of the E-shaft to complete a 4 stroke Otto cycle of a internal combustion engine with a 3 sided rotor.
So for example if you designed a rotary engine with a 4 sided rotor and appropriate housing geometry to suit, the ratio would be 1:4 and so on.
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