Ken
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1.Seat impactor
1.1 Circulal body, 200 mm in diameter separated from the striking surface by helical compression springs and free to move relative to it on a line perpendicular to the plane of the central area of the striking surface.The body and associated parts minus the springs shall have a mass of 17kg and the whole apparatus,including mass,springs and striking surface,shall have a mass of 25kg.
1.2. Springs,which shall be such that the combined spring system has a nominal spring rate of 7N/mm and the total friction resistance of the moving parts is between o,25 N and 0,45 N.
The spring system shall be compressed to an initial load of 1040 N (measured statically) and the amount of spring compression movement available from the intial compression point to the point where the springs become fully closed shall be not less than 60mm.
1.3 Striking surface,shall be a rigid circular object,200mm in diameter,the face of which has a convex spherical curvature of 300 mm radius with a 12mm front edge radius
Ken
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