Boomerang Lays Over

The distance between the boomerang’s centre of lift and centre of gravity causes front edge of disk of rotation to rise (pitching up moment). Because of gyroscopic precession, this force on the axis of spin is twisted at right angles, making the boomerang "lie down" in flight. This aligns more of the boomerang’s overall lifting force aginst the force of gravity, causing it to rise and sustain soaring flight, rather than crashing to the ground.