Dynamically Balanced Ovoid Sports Ball
A dynamically balanced inflatable ovoid sports ball (10) has a polar axis x, a first principal equatorial axis y and a second principal equatorial axis z. The axes x, y, z are mutually perpendicular and coincide at an origin o at the ball's centre of geometry. The ball (10) comprises an air inlet valve (11) to permit inflation thereof, and at least one additional mass element (12) adapted to counter-balance the mass of the valve (11). The air inlet valve (11) and each additional mass element (12) are arranged relative to one another such that the centre of mass of the ball (10) is substantially coincident with the origin o, and such that the difference between the average mass moment of inertia I yy of the ball (10) when rotated about the first principal equatorial axis y, and the average mass moment of inertia I zz of the ball (10) when rotated about the second principal equatorial axis z, is less than 3.46% of the value of I yy. .
JONES ROY [GB]; YEADON MAURICE RAYMOND [GB]; HOLMES CHRISTOPHER EDUWARD [GB]; HARLAND ANDREW ROBERT [GB]
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