There are actually two types of boomerangs. One flies in a circular path. It can knock you out cold. And the other is the non-returning boomerang.
Both have at least two wings. They meet at an angle.
The bent shape causes the boomerangs' to spin around a central point when it is thrown. That steadies their movement. It allows them to travel farther. It allows them to travel with greater accuracy than a straight stick.
That's exactly what makes the non-returning boomerang a deadly hunting weapon.
They've been used in Australia. They've been used in ancient Egypt. And even Poland. The earliest ones date back more than 20 thousand years.
But let's come back around to your question. How does the returning boomerang return?
Well, its wings are slightly rotated. They have an airfoil design. It generates twist.
That creates a curved flight path. That path sends that puppy home.
The returning boomerang is actually harder to throw on target. It's been used more for fun than hunting.
Fun must have been what those ancient Egyptians had in mind. That might be why they stored a few in King Tut's tomb.