发明授权
US4337950A Circular boomerang 失效
圆形回旋镖

Circular boomerang
摘要:
A toy boomerang is provided in the form of a generally flat circular body having a plurality of spiral arms extending between a central hub and an outer annulus. Each spiral arm defines an airfoil providing lift to the toy when it is spun through the air. The toy is used by spinning it into the air by a swinging, snapping movement of the arm and wrist whereupon the toy will follow a rising straight trajectory to a stall point and then reverse its direction and return directly back to the thrower.
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