In many research papers, the relationship between the hammer head velocity and the radius of curvature of hammer was discussed. The purpose of this study was to re-examine the relationship between the hammer head velocity and change in the radius of curvature with the 2-D computer simulation. The decrease and increase in the radius of curvature had no relationship with the change in the head velocity while the leading angle was 0°. The mechanical power applied to the head was calculated as the scalar product of the velocity vector and force vector. The zero leading angle means that the force vector, which was parallel to the acceleration vector of the head, was perpendicular to the head velocity vector, so that the zero mechanical power could not increase the hammer head velocity. The positive leading angle generates the positive power to increase the head velocity, and negative leading angle to decrease the head velocity. It may be inferred that the thrower decreased the radius of curvature to release the handle within the throwing circle with 2.13 m diameter.
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