Abstract: The present invention provides a substantially flat boomerang device comprising a flat central ring member having inner and outer circular boundaries and defining a central aperture, at least two wing members projecting outwardly from the outer boundary of the ring substantially in the plane thereof, each wing member being of asymmetrical aerofoil section and being arranged to act in the same direction as all of the other wings, such that when the device is thrown with a rotary motion the wings produce lift and also turn. The wing members are backwardly swept by an angle in the range of 2.degree. to 20.degree. and flat, drag-reducing skirts are provided extending between the sides of the wings and adjacent sides of the outer ring.