What makes a boomerang come back when used properly ?

Answer 1

Basically, the same effects that allows a plane to fly and turn.

Planes and boomerangs rely mostly on the angle of attack from the wing to the air to get lift that keeps them afloat, so to speak. You can see that when a plane takes off: it points its nose up, increasing the angle of attack on the wings, creating more lift and going up.

The boomerang arms are shaped to create lift, like the wings of the plane. That keeps it flying for a while. But it is also thrown to spin; that means the angle of attack on the arm rotating in the direction of the spin is higher and its speed greater, creating more lift on this side. That creates a twisting movement, that turns the boomerang into a gyroscope.

Gyroscopic physics come into play (detailed in the second link), causing the boomerang to 'be attracted' to the center of its flight path, a bit like the orbit of a planet around the Sun. If it was thrown well, the boomerang will not slow down too much in its flight, the force attracting it to the center will remain more or less the same, and it will describe a perfect circle - back in your hand :)

The links detail the physics behind it:

Answer 2

The wind. The boomerang is shaped so that if you throw it into the wind at the correct angle, the breeze will help bring it back.

Answer 3

the unique V-shape design that allows the momentum to guide the boomerang directions according to the spin style (clock wise or anti-clock wise)

kinda what i remembered from my 1st year in secondary school

Answer 4

the shape
the boomerang is bent slightly

Answer 5

It's shape

Answer 6

dont know