When it comes to the Soviet and Belarusian automobile industry, the imagination often pictures massive trucks with diesel engines and bulky cabs. However, among this technology there is one instance that stands out from the general series with its futurism and scale. MAZ-7907, codenamed “Tselina-2”, is a wheeled tractor designed to transport super-heavy loads in completely off-road conditions.
This vehicle was created as part of the secret Tselina project, the purpose of which was to transport Topol missile systems to the launch site. Engineers needed a solution capable of carrying more than one hundred tons of payload, while maintaining high cross-country ability and maneuverability. The result was a car with 24 wheels, a turbo-gas turbine engine and a wheel steering system implemented with amazing precision.
Uniqueness MAZ-7907 lies not only in the number of axes, but also in an integrated approach to design. Here are solutions that were considered theoretical for decades. In this article we will analyze in detail the design, technical features and fate of this engineering miracle, which still remains one of the most impressive examples of special equipment in the world.
History of creation and purpose of the complex
Development of the tractor began in the late 1970s, when it became obvious that existing tracked tractors could not provide the required march speed for mobile missile systems. The Minsk Automobile Plant was tasked with creating a platform that could move starting positions weighing more than 100 tons on any soil. The project received a code "Virgin Land", and the car is index 7907.
The main customer was the USSR Ministry of Defense, which required ensuring the secrecy and mobility of strategic nuclear forces. Tracked vehicles left too noticeable a mark and had speed restrictions, so the choice fell on a wheeled design with a distributed load. Engineers under the leadership of V.E. Popecho developed a concept where each design element served to increase cross-country ability.
⚠️ Attention: Despite the fact that the vehicle was created in the 1980s, the documentation for the Tselina project is still classified in many aspects regarding ballistics and exact routes.
Prototypes MAZ-7907 successfully passed tests in various climatic zones, from the sands of Central Asia to the snows of Siberia. The vehicle has proven its ability to overcome fords, ditches and steep climbs while carrying heavy military equipment on board. However, the collapse of the Soviet Union and changes in military doctrine did not allow the complex to be put into mass production.
Today MAZ-7907 remains a unique monument of engineering, demonstrating how high the ambitions of the designers of that time were. The machine was created with the expectation of operation in extreme conditions, where equipment failure was unacceptable.
Chassis design and wheel arrangement
Visually MAZ-7907 resembles a train rather than a regular car. Its wheel formula 24×24 means that all 24 wheels are driven. This distribution of traction allows the machine to feel confident even on sticky soils, where other equipment would instantly get stuck. The total weight of the tractor in running order reaches 120 tons.
The machine frame is made of high-strength steel and has a complex hinge design. This is necessary so that the wheelbase can adapt to the terrain. Each axle is suspended independently, ensuring uniform distribution of ground pressure. Tire pressure can be adjusted centrally, which is critical for driving on sand or snow.
- 🚜 Number of wheels: 24 pieces (12 axles).
- ⚖️ Loading capacity: up to 110 tons (according to other sources, up to 160 tons as part of a road train).
- 📏 Machine length: more than 22 meters.
- 🛣️ Ground clearance: adjustable, allows you to overcome obstacles up to 1.5 meters high.
The turning system deserves special attention. Unlike conventional trucks, where only the front wheels turn, MAZ-7907 All 12 axes rotate. This is realized through a complex hydraulic system that synchronizes the turning angles of each pair of wheels. The turning radius of such a colossus is only 18 meters, which is comparable to the turning radius of a regular passenger car.
To control the rotation of 12 axles, an electronic-hydraulic system is used, which automatically calculates the required angle for each axle depending on the turning radius, preventing wheel drift.
The tires installed on the tractor have special treads designed to work in the conditions of the far north and deserts. They are puncture-resistant and can move even if partially damaged, which is important for a combat vehicle. Replacing such a wheel is a separate complex operation that requires special equipment.
Powerplant and transmission
With my heart MAZ-7907 is not a conventional diesel engine, but a gas turbine unit. The engine was used as a power plant GTD-1250, developed by NPO Saturn. This choice was dictated by the need to obtain enormous power in a relatively compact size and the ability to operate on various types of fuel.
Engine power is 1250 horsepower. The gas turbine has high injectivity and operates stably at low temperatures, which is critical for the conditions of the Far North. However, such engines also have their own characteristics, in particular, high fuel consumption and sensitivity to the quality of air at the intake.
| Parameter | Meaning | Note |
|---|---|---|
| Engine type | Gas turbine GTD-1250 | Development of NPO Saturn |
| Power | 1250 hp | At 23000 rpm |
| Transmission | Hydromechanical | 7 steps forward, 3 back |
| Maximum speed | 50 km/h | Full load |
| Power reserve | 500 km | On the highway |
The tractor's transmission is also unique. It is a complex hydromechanical gearbox that transmits torque to all 12 axles. Heavy-duty differentials and locking differentials are used to control power flow. The engine and transmission cooling system takes up a significant portion of the vehicle's volume, since heat removal from the gas turbine requires efficient radiators.
⚠️ Attention: Gas turbine engines consume significantly more fuel at idle speed than their diesel counterparts, so long-term parking with the engine running at Tselina-2 is not economically feasible.
Fuel tanks MAZ-7907 located on the sides of the cabin and have an impressive volume. Fuel consumption when driving over rough terrain can reach hundreds of liters per 100 kilometers, which makes the car dependent on well-organized fuel and lubricants logistics.
Cabin and control systems
Cabin MAZ-7907 located high above ground level, which provides the crew with excellent visibility. Inside, it looks more like an airplane pilot's cabin or a ship's captain's cabin than a truck driver's cabin. The dashboard is full of many indicators that monitor the operation of each of the 12 axles, tire pressure, turbine temperature and hydraulic parameters.
The car is controlled through the steering wheel and pedals, but the effort on them is minimal thanks to powerful hydraulic boosters. The driver does not need to exert any physical effort to turn the multi-ton vehicle. All systems are redundant to increase reliability, since failure of any of them in the field could have fatal consequences.
- 👨✈️ Crew: 2-3 people (driver, commander, mechanic).
- 🎛️ Instrument panel: analog-digital with many sensors.
- 🛋️ Comfort: availability of sleeping space and air conditioning system.
- 🔊 Communications: built-in radios for communication with command.
The ergonomics of the cabin are designed for long-term autonomous operation. There is a life support system that allows the crew to stay inside the vehicle in conditions of radioactive contamination or chemical attack. Filter ventilation units purify the air by creating excess pressure inside the cabin.
Secret cabin functions
The MAZ-7907 cabin is equipped with an emergency escape and sealing system, as well as special mounts for maps and navigation equipment, allowing you to drive the car in complete darkness using instruments.
To facilitate entry and exit, the cabin is equipped with convenient stairs and handrails. Considering the height of the driver's workplace, this is a necessary safety condition. Visibility through large glass areas allows you to control the dimensions of the machine, which is critical when maneuvering in wooded areas.
Maintenance and Operation
Operating such a complex machine as MAZ-7907, requires the highest qualifications of personnel. Maintenance is carried out according to regulations, which include checking the condition of all 12 bridges, diagnosing the gas turbine and checking the tightness of the hydraulic systems. Any malfunction must be corrected immediately.
The main difficulty is access to components and assemblies. Many elements are hidden under massive covers or located in hard-to-reach areas of the frame. Repairs often require special lifting equipment and tools. Spare parts for MAZ-7907 are not mass produced, so their safety and availability in warehouses is a strategic issue.
Regulatory work includes:
- 🔧 Checking the oil level in the gearboxes of all 12 axles.
- 💨 Blowing gas turbine engine air filters.
- 🩸 Pressure control in the hydraulic turning system.
- 🔋 Checking the charge of batteries and generators.
⚠️ Attention: The gas turbine engine is extremely sensitive to foreign objects. Before starting, the air intakes should be visually inspected for birds, leaves or debris.
Despite the difficulties, the machine is designed to be repairable in the field. Key components can be replaced by the crew or a mobile repair team. The frame design allows for welding if necessary, although this is not recommended for high-strength steels without subsequent heat treatment.
Comparison with analogues and current state
At the time of creation MAZ-7907 there were no direct analogues in the world. American developments in the field of heavy tractors followed the path of using tracked platforms or fewer wheels. The Soviet 24-wheel approach achieved a unique balance between lifting capacity and ground pressure.
Extant copies today MAZ-7907 located in museums or closed storage facilities. From time to time, information emerges about the possible modernization of these vehicles or the use of their chassis for civilian needs, for example, for transporting large cargo for the oil and gas industry. However, the economic feasibility of such projects is questionable.
☑️ Checking the readiness of the MAZ-7907 for march
However, the technologies developed at Tselina-2 have found application in other models of the Minsk Automobile Plant. The experience of creating multi-axle off-road chassis has become an invaluable asset for the design bureau. The car remains a symbol of an era when engineering knew no boundaries.
MAZ-7907 “Tselina-2” remains a unique example of the implementation of a 24-wheel scheme with a gas turbine engine, which has no complete analogues in the world history of the automotive industry.
Frequently asked questions (FAQ)
Is the MAZ-7907 preserved in a single copy?
No, several prototypes were built. Some of them are stored in technical museums, for example, in the museum of military equipment, and some are on the balance sheet of defense enterprises. The exact number of surviving vehicles is classified.
Why did you choose a gas turbine engine for the tractor?
The GTD-1250 gas turbine had a high specific power, lighter weight compared to a diesel engine of similar power, and better startability in the Far North. In addition, it could operate on various types of liquid fuel.
Was the MAZ-7907 used in combat?
No, the Tselina complex with the MAZ-7907 tractor did not take part in real combat operations. The vehicle was created as a means of delivering missile systems in the event of a global conflict, which, fortunately, did not occur on a full scale.
What is the maximum speed of the MAZ-7907?
The maximum speed of the tractor on the highway is about 50 km/h. On rough terrain, the speed is much lower and depends on the condition of the ground, but thanks to 24 wheels it remains high enough for heavy equipment.
Is it possible to see the MAZ-7907 live?
Yes, one of the copies is occasionally exhibited in museums of military equipment, such as the museum in Patriot Park or technical exhibitions in Minsk. However, access to them may be limited and it is best to confirm information before visiting.