Harrow Disk Curvature — Influence on Soil Penetration

ABSTRACT A series of seven 610-mm-diameter disks was con-structed with radii of curvature varying from infinite (flat disk) to 494 mm. The soil penetration of these disks depended on velocity, mass on the disk, and disk angle. At disk angles from 0.2 to 0.35 rad, disks with large radii of curvature penetrated deeper. At disk angles above 0.35 rad, small radii of curvature disks penetrated deep-er. In terms of disk penetration, the optimum value of radius of curvature-to-disk-diameter (R/D) ratio ap-pears to be 2.92 to 1.50.