Drag Coefficients of Locomotion over Viscous Soils

To determine drag of wheel or track moving through mud, concepts of hydrodynamics pertaining to incompressible viscous fluids may be applied; problem is one of viscous flow around partially submerged object; variation in pressure causes bulldozing effect in front of wheel, and wake behind wheel; pressure drag may be reduced by streamlining wheel; comparison between various wheel forms presented in chart.