How could we forget you Drac? When something smashes into snow hard enough, and I think you robot is heavy enough to do it, it sprays out, not only snow, but earth as well and the object would create a crater with debris spread out in a fan shape from the crash site. The edge of the crater would be higher at one side of the impacted object if it hit at an angle, and would in general be higher around the object sweeping down to the level of the surrounding ground. Hope this is of some use to you. 8) Catlin