Why a boomerang comes back - Deepstash

Why a boomerang comes back

When you throw the boomerang: 

  • It not only spins propeller motion but also flies through the air.
  • The wing at the top of the spin moves in the same direction as the forward motion of the throw, while the bottom wing moves in the opposite direction.
  • This causes the top wing to move through the air at a higher speed.
  • It makes more air pass under it and creates lift because the wing has to exert more force to push down the increased mass.
  • It is as if someone is continually pushing the spinning propeller at the top of the spin, causing it to keep turning, travelling in a circle.


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Airplanes: Explaining pressure differences

Most aeroplane wings are curved on the upper surface and flatter on the lower surface, making a sectional shape, named an airfoil.

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