IN DRAWING (1) THE ORBITAL ENGINE SIMPLY CONSISTS OF OUTER CASING (1) WITHIN IT IS MOUNTED A CYLINDRICAL ROTOR (3) CO-AXIAL HAS FOUR SLOTS FITTED WITH SLIDABLE VANES (43) AND HAS AN ORBITAL MOTION WITH OUT ROTATION AROUND CRANK SHAFT (6) AND WITHOUT FRICTION TO THE INSIDE PART OF CASING (1) ; THAT CREATS FOUR COMBUSTION CHAMBERS BETWEEN THE ROTOR &THE OUTER CASING , WHILE THE VANES TAKE AN OSSILLATION MOTION ON FLAT BASE AT THE INSIDER PART OF OUTER CASING , THE DRAWING DESCRIBES WHAT IS HAPPENING IN COMBUSTION CHAMBER ATTACHING TO PART (Α ) FROM A TO L , AND THAT ALSO HAPPENS IN CHEMBERS ATTACHING TO PARTS Β & (Φ) & ( Γ