| 摘要 |
The ball is intended for entertainment, especially for lawn tennis. It increases the length of flight. The ball consists of two immovably attached thin semi-spherical shells (1) with numerous openings (2), evenly located along the entire top, forming a plaited structure on the surfaces. A propeller (3) is placed in the inner cavity of the ball, which has an axis (4) coinciding with one of the diameters of the sphere. An aerodynamic disbalancing mass (5) is located along axis (4) of the propeller (3). The propeller (3) is immovably connected to the semi-spherical shells (1).<IMAGE>
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