Flight Path Begins to Curve

Spin plus forward motion causes uneven lift on the boomerang’s wings. The wing at the top of the cycle has it’s spin motion added to it’s forward motion, producing a higher air speed and more lift than on the other wing. This uneven lift across the plane of rotation produces a tilting force on the spin axis. Because of gyroscopic precession, this force on the axis is twisted at right angles causing the boomerang’s flight to curve into a circular path.