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    Boomerangs - Why Do They Come Back?- The Math(s)
    By Martin Gardiner | January 21st 2014 08:13 AM | Print | E-mail | Track Comments
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    Many may have asked the questions ‘Why are boomerangs crescent-shaped?’ and ‘Why do boomerangs come back?’ – but few, however, are in a position to provide scientific explanations – aside, that is, from Prof. Yutaka Nishiyama of the Osaka University of Economics, Japan. In his article ‘Why Do Boomerangs Come Back?’ (Bulletin of Science, Technology&Society, Vol.22, No.1, 13-20,Feb 2002.) he answers both, with references to Bernoulli’s Principle, gyroscopes, inertial moments, the ‘right-hand-rule’, and more. Noting, for example :

    “A boomerang, along with making a left turn when thrown vertically, also makes a sideways fall and returns in a horizontal position. Difference in the lift force between the top and bottom of the wing forms the force to left-turn the boomerang, whereas the difference in the lift force between front and back of the wings forms the force to make a boomerang fall sideward”

    The professor also provides (via the Kansai Boomerang Network) a comprehensive set of instructions on how to construct and operate a three-bladed boomerang made out of cardboard – which he has personally translated into 70 different languages.

    “Recommend this boomerang to your friends, or neighbors for world peace!”

    Note: Professor Nishiyama is Honored Director of the Japan Boomerang Association.