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spin - SPIN Curve Balls The fact that tennis balls curve...

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SPIN
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In 1877 Lord Rayleigh in a paper also describing the irregular flight of a tennis ball, credited G. Magnus with the first explanation of the lateral deflection of a spinning ball in 1853. A similar explanation was given by Robins, a century before. The fact that tennis balls curve because of the spin imparted on them was noted as early as 1671 by Sir Isaac Newton. Curve Balls v v Magnus and Robins explained phenomenon by invoking Bernoulli’s Equation U increases, P decreases U decreases, P increases
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EFFECT OF SPIN SEPARATION POINTS Spin develops lift force because: Velocity higher on top; Separation delayed on top; Wake is deflected downward . V + ω r V - ω r
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Visualization of the flow on a counter-rotating (left) and non-rotating Wheel. Re = 0.53 x 10 6 . From Race Car Aerodynamics by J. Katz SEPARATION SEPARATION
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Separation Separation WHICH WAY IS BALL SPINNING?
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Separation Separation Flow from left to right, spin is clockwise, visualization via smoke
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Magnus force mostly affected by spin ratio, ω D/(2V).
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