Abstract: A rotary internal combustion engine comprises a stator having an enclosed chamber defined by a pair of opposing side walls and a peripheral wall extending therebetween. A rotor in the chamber is rotatable by a shaft extending between the side walls. The rotor has at least one arm projecting radially from the shaft and a rotator member pivotally mounted on the end of the arm by a pivot pin. The rotator member has a working surface which spans between the side walls and has leading and trailing surfaces in contact with the peripheral wall, thereby defining a combustion chamber. Air is introduced into the chamber by at least one outlet passage which is rotatable within the chamber and opens radially, with respect to the shaft, into the chamber.