Abstract: The invention relates to a rotary internal combustion engine. More specifically, the invention relates to a coaxial stator (1) and rotor (7). The stator (1) is provided with an inlet nozzle (19) and an exhaust nozzle (20) while the rotor is provided with radial mobile blades (9) which are disposed in grooves (8) with room to move. According to the invention, the inner tips of the aforementioned blades (9) are provided with shafts (15) and a pair of connecting rods (16) is articulated to each of said shafts (15). In this way, at each of the ends of the engine, four connecting rods (16) form a deformable parallelogram which connects four alternating blades (9), while another four connecting rods form a second parallelogram which connects the other four blades.