Abstract: A compact power driven ski bob is attained by locating the driving tracks of a rear power ski beneath the seat and pivotally mounting the front end of the power ski longitudinally forward of the seat. The rear end of the power ski is biased into engagement with the snow and is located lower than the front end of the ski to enhance driving contact with the snow. The seated operator is cushioned from impact forces and up and down movements of the power ski by a rear attachment means comprising a lost motion connection and a shock absorber. To aid in transportation of the snow bob, the front ski and the fuel tanks are detachably connected to the frame.

Abstract: A power driven ski vehicle of the ski bob kind is driven by a power ski having a pair of running surfaces on the undersides of the power ski for sliding engagement with the snow and for supporting a substantial portion of th weight of the vehicle and rider. Each of the running surfaces is disposed intermediate an outboard turning flange, located along the outer ski edge, and a central tunnel through which a propulsion track travels. Preferably, the running surfaces are inclined in the transverse direction and their inner edges define a pair of inner reaction or turning edges parallel to the outer turning flanges. The entry and exit ends of the tunnels are configured to reduce wear of the propulsion track as it enters and exits the underside of the ski and is changing its direction of travel.

Abstract: A power driven snow bob is provided with a detachable fuel tank which can be readily attached and reattached in a rapid and expedient manner in a cold outdoor environment. To assist in retaining the fuel tank, it is formed with a groove on its under surface which mates with a cross bar portion of the frame and with a sliding interlock portion at one end for sliding in an interlocking relationship with a retaining means on the frame. At the other end of the fuel tank, a quick connect and disconnect means comprising a push-pull retaining pin is inserted through aligned apertures in a fuel tank and a grommet on the fuel tank. The fuel line is detachably connected to a fitting having a shut-off valve.