The Influence of Harrow Disk Curvature on Forces

ABSTRACT A series of seven 610-mm-diameter disks having radii of curvature varying from infinite (flat disk) to 494 mm were tested for draft, vertical, and side forces. At disk angles between 0.2 and 0.3 rad, the smaller the cur-vature of the disk, the larger the soil force on the back surface of the disk. Because of the magnitude and direc-tion of the side force, optimum disk shapes, both in terms of forces and soil handling, may lie in the in-termediate range of radii of curvature-to-disk diameter (1.33 to 2.92) rather than at the extremes studied.

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