are no track-return rollers. The first and last road wheels have a hydraulic shock absorber, the steel tracks have a single pin and 96 links each when new. There is a small, thin, horizontal skirt over each track. The BTR-50 is powered by a V-6 6-cylinder 4-stroke in line water-cooled diesel engine developing 240 hp (179 kW) at 1800 rpm. This gives it a road speed of 44 km/h with a cruising range of 400 km. The vehicle can negotiate 30° side slopes, ascend 60° gradients, cross 1.1 m high vertical obstacles and 2.8 m wide trenches. The engine has a cooling system and a pre-heater (intended for ignition when the air temperature is −20 °C or below). The APC has a five gear manual shaft-type transmission system similar to that in the T-34/85 medium tank. The gearbox has four forward and one reverse gear. The vehicle has a side clutch that enables it to make turns, mechanical transmission and a bandbrake. The vehicle has three fuel tanks, two on the right at the front of the engine compartment and one at the rear. The total fuel capacity is 400 liters. The vehicle has four mounts for additional external fuel tanks located on the rear of the hull; the two on the hull corners are for a flat external tanks, whereas the two in the center are for a drum-type of tank. The BTR-50 is amphibious thanks to its flat, boat-shaped hull, which is hermetically sealed and ensures minimal resistance when the APC is afloat. It can swim after switching on the two electric bilge pumps; erecting the trim vane which improves the stability and displacement of the vehicle in the water and prevents water from flooding over the bow of the APC. Swapping the driver's periscope for a swimming periscope enables the driver to see over the trim vane. There is also a manual bilge pump for emergency use. In the water, it is propelled by two hydrojets, one on each side of the hull, the inlets are under the hull, the outlets are at the rear. There are also additional assistant water-jet inlets on both sides of the hull over the last road wheels. The rear outlets have lids that can be fully or partially closed, redirecting the water stream to the forward-directed outlets at the sides of the hull, thus enabling the vehicle to turn. This system