Abstract: The present invention is concerned with a tracking device (10) including: a sensor system (12) configured to determine at least one movement parameter of the tracking device and output movement parameter data; a power supply (34) arranged to supply electrical power to the tracking device; a memory (30); and a processor system (24) including: a data processor (26) configured, in accordance with one or more operational parameters stored in the memory, to: control the determination of said at least one movement parameter by the sensor system; and process the movement parameter data and output one or more derived parameters; and a second data processor (26) configured to: operate independently from the data processor; and manage access to the memory and storage therein of: the one or more operational parameters; a log of said movement parameter data output from the sensor system; and said derived parameters.

Abstract: A ball-striking sole for a table tennis paddle comprises a flexible coating (118) of elastic material, one face (135) of which is lined with elastically deformable pimples (120) which protrude from said face. The cross section of said pimples is greater in their region (122) of attachment to this coating than in the region close to their opposite end (124) and the side wall (125) of these pimples has a concave curved profile over at least a part of the height of the pimple between these two regions. This sole is used particularly successfully in a table tennis paddle in which the face of said sole (112) lined with pimples (120) is directed towards the inner side of the blade (115) of the paddle such that the free ends (124) of the pimples, the lateral surface of which has a concave curved profile (125), are pressed against a layer (126) of elastic material, secured to the blade, the modulus of elasticity of which is much lower than that of the elastic coating (118) of the sole.

Abstract: A ball-striking sole for a table tennis paddle comprises a flexible coating (118) of elastic material, one face (135) of which is lined with elastically deformable pimples (120) which protrude from said face. The cross section of said pimples is greater in their region (122) of attachment to this coating than in the region close to their opposite end (124) and the side wall (125) of these pimples has a concave curved profile over at least a part of the height of the pimple between these two regions. This sole is used particularly successfully in a table tennis paddle in which the face of said sole (112) lined with pimples (120) is directed towards the inner side of the blade (115) of the paddle such that the free ends (124) of the pimples, the lateral surface of which has a concave curved profile (125), are pressed against a layer (126) of elastic material, secured to the blade, the modulus of elasticity of which is much lower than that of the elastic coating (118) of the sole.