Abstract: A boomerang is made from a flat sheet material, and includes interconnecting portions angularly displaced from one another about a center point, and terminating at an arc boundary that cooperates with the center point to define a radius, and blades integrally and respectively formed with the interconnecting portions. Each blade has a bent line which extends from an outer point at a distal edge to an inner point at the arc boundary, and which is of a length that is equal to the radius. The bent line meets a radius line at the arc boundary to form a vertex with an included angle of obtuseness. Varying the interior angle formed by each of the bent line and the radius line with a base line interconnecting the outer point and the center point can change flight patterns of the boomerang.

Abstract: A boomerang is made from a flat sheet material, and includes a plurality of blades connected to a central body by a plurality of interconnecting portions, and angularly displaced from one another about a center point. Each blade includes leading and trailing edges that are symmetrical relative to a middle line. Each interconnecting portion extends along a radial axis which intersects the middle line to form an obtuse included angle therewith. Each blade has a bent line that is positioned between the middle line and the trailing edge thereof, and cooperates with the trailing edge to define a bent portion which faces towards the leading edge and which forms an obtuse included angle with a horizontal plane. Varying the position of the bent lines and the included angles of the bent portions can change flight patterns and flight range of the boomerang.