Rotary internal-combustion engine

A rotary internal-combustion engine, comprising at least one fixed hollow body (2), and a movable body (3) rotatable coaxially inside the fixed body, a chamber (4) for a working fluid formed between the cylindrical bodies (2, 3), at least one intake (5) and at least one exhaust (6), at least one vane element (7) associated with the outer surface of the movable body (2) and extended in axial direction, at least one first and second partitions (8a, 8b) for dividing the chamber (4), the vane element (7), cooperating respectively with the intake (5) to aspirate working fluid into the chamber (4), with the second partition (8b) to compress it, with the first partition (8a) to form a combustion chamber, and with the exhaust (6) for working fluid expelling.