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A power plant comprising a rotor having a plurality of circumfercntially spaced combustion chambers; a stator having an air intake port and a pair of exhaust ports disposed so that upon rotor rotation said air intake port communicates sequentially with said chambers at one of their ends and each of said exhaust' ports communicate sequentially with said chambers at their other ends; means for adding fuel to said chambers; and means for initiating combustion within said chambers; the relative circumferential positions of said ports and the point of combustion initiation within said chambers being such that during rotor rotation and after combustion in a chamber, said chamber, cyclically and in the sequence stated, is placed in communication with one of said exhaust ports, is closed to said one exhaust port, is placed in communication with the other of said exhaust ports, is placed in communication with said intake port, is closed to said other exhaust port, is closed to said intake port, and thereafter combustion is initiated in said chamber while it is closed to all of said ports, the overlap between said intake port and said other exhaust port being sufficiently large so that in each said cycle each said chamber is simultaneously in communication with said intake port and said other exhaust port for a length of time substantially longer than the length of time said chamber is in communication solely with either of said latter two ports.