Examination of heat generation in an earthmover tire traversing rigid terrain indicates that almost all heat originates in the tire bulk; heat generated in the contact area is small and can be neglected. Modeling of equilibrium bulk heat requires using the same compound for model and prototype, keeping both tires geometrically similar, and running them at constant speed long enough to reach equilibrium temperature. Then, three model rules apply; one allows for geometrical distortion of cord arrangement in static loading, and the others impose similar mechanisms of heat generation and dissipation on the model and prototype. The effect of cord distortion on heat generation is unknown, however, and has to be assessed experimentally.
Preliminary tests indicate that the model rules of heat generation are basically correct. Problems associated with stress distortion (due to cord distortion), heat convection, and inflation pressure buildup (due to heat buildup) remain. Self‐modeling tests on the same tire, and scale model tests with geometrically similar tires are recommended.