When the boomerang is thrown with high spin, a boomerang flies in a curved rather than a straight line. When thrown correctly, a boomerang returns to its starting point. As the wing rotates and the boomerang moves through the air, the airflow over the wings creates lift on both "wings".

How do boomerangs come back to you?

Returning boomerangs have a special curved shape and two or more wings that will spin to create unbalanced aerodynamic forces. These forces — sometimes called “lift" — cause the boomerang's path to curve in an elliptical shape, so that it will return to the thrower when thrown correctly.

What's the science behind a boomerang?

A boomerang is an example of gyroscopic precession. The airfoil causes it to "fly" in the direction thrown, but the higher aerodynamic lift on the top end creates a torque which causes the angular momentum to precess, gradually changing the heading of the airfoil and moving it in the curved path. ...