Abstract: The internal combustion rotary engine comprises a stator (1) and a rotor (2) that are disposed so that the inner circumference of the stator (1), at least in certain pre-determined circumferential sectors thereof, sealingly surrounds the rotor (2). The stator (1) is provided with at least two combustion chambers. Each combustion chamber has a discharge outlet opening tangentially towards the rotor (2), and at least one fuel inlet (15) through which oxygen or air and fuel, in pre-determined amounts such as to form a combustible mixture, can be injected into the combustion chamber at pre-determined intervals. The rotor (2) has outer ring segments (23) connected to a main shaft (21) by a plurality of spokes (22).