Boomerangs have been around for thousands of years now. Traditionally, returning boomerangs are lightweight, made of wood, and consist of two separate wings which meet at an angle at the joining.
All boomerangs aren’t made to come back! Some are made just to hit the target. Now let’s see, how a coming back boomerangs work?
The top and bottom portions of a boomerang are made in an aerodynamic shape or an airfoil shape. Top one is Leading edge and the bottom one is trailing edge. When boomerang is thrown and the air passes through this shape, it results in a lift as shown below.
When you throw a boomerang, there are two speeds to be considered, one in the forward direction and the other is rotating speed. This makes it fly and rotate at the same time. As the boomerang spins through the air, the wing at the top of the spin is moving through the air at a faster rate than the wing at the bottom. This makes the top portion generate more lift than the bottom portion as it cuts through the air.
Because the top portion of the boomerang is moving faster than the bottom portion, some torque is generated, which makes the boomerang tilt the plane of rotation slightly such that, the boomerang ends up flying in a curved path through the air. This makes the boomerang come back. It’s not easy to catch the boomerang back. It depends on the angle and force with which you throw with..
All those images are from Google!