MAZ-7906 / MAZ-7907
Operation of the chassis "7904" made it possible to accumulate the necessary experience, which was later used to create Chassis MAZ-7906 machines for the ground launcher of the complex "Tselina-2". In 1984 two MAZ-7906 specimens (16x16) were manufactured at the MAZ plant, and after a year, the MAZ-7907 (24x24) was also manufactured. Two "MAZ-7906" and "MAZ-7907" chassis were created for the "Celina-2" complex at MAZ. In the early 1980s, both versions of a chassis of a ground-based transport unit with a carrying capacity of up to 140-150 tons were tested. The diameter of the wheels (made by Bridgestone) is 2.8 meters.
The chassis should have been capable of transporting a 104.5-tonne, 22.6-meter-long Molodets missile. Not only to transport, but also withstand the launch of the rocket. MAZ-7906 had a hydromechanical transmission, a diesel engine with a capacity of 1500 hp and the wheel formula 16x16. Chassis MAZ-7907 ground launcher complex "Tselina-2" MAZ-7907 had 12 axles and all the wheels leading, front and rear - driven. On the chassis "7907" were installed electric transmission of alternating current and gas turbine engine with a power of 1200 hp. The turning radius of the vehicle turned out to be less than the length of the vehicle itself. The eight middle wheels (5, 6, 7 and 8) did not rotate the steering wheel, while the eight front wheels could be rotated one-way, and the eight rear-to-opposite ones. The machine was designed for operation with mounted equipment in off-road conditions and it was successfully tested. The chassis "7907" and "7906 were intended for the transportation of missiles to the launch site, which were supposed to be built for one missile.
The engines were located on the front part of the frame under the original 3-place cabin with 3-part windshield. The engine powered only electric generator VSG-625 which transfer energy through transmission to 24 electric motors (30 kW each). The second design feature is the articulated frame. It was extremely long and could be broken during truck movement. To avoid this, engineers divided it into two equal-sized hexagonal sections and set a simple horizontal hinge between them. First 4 axles and 4 rear axles were driveable. Each wheel has independent hydroair suspension, which was similar to the MAZ 7906.
After the successful completion of the research tests, the MAZ-7906 and MAZ-7907 special chassis were dismantled and sent by rail to the Volgograd Barrikady Plant for installation of the 15U157 autonomous launcher equipment of the 15P162 Celina-2 mobile ground-based strategic missile system. Then again dismantling, loading onto the railway platforms and in the way - to the place of comparative tests, which were conducted on the basis of the 7th guards Rezhitsa Red Banner Rocket Division near the town of Bologoye in the Kalininskaya (now Tver) region. In March 1986, the MAZ-7906 tests began there, and in September the MAZ-7907.
Their outcome was to be the choice of the chassis type of the missile complex 15P162. For the tests, giant structures were built - hangars, in which the chassis were concealed and serviced, as well as special sections of roads with bridges and junctions to investigate the damaging effect of the wheels of auto giants on their asphalt concrete pavement. All activities were conducted only in the dark, in the strictest secrecy. Test teams, which replaced each other every forty days, drove to the test site, overcoming several checkpoints. Before each they left the bus and passed through them strictly one by one, presenting the relevant documents. The tight timing and high intensity of the test program required the involvement of a large group of factory test drivers: A. Savina, F. Tsurpo, V.
In the process of testing, there were various problems that were solved in a military way - right on the spot. Thus, when the MAZ-7907 moved with the mock-up of the transport-launch container of the 15Z62 missile over the hilly terrain, its nose was "punctured" into the front axle of the chassis. Chief designer of the complex A. Nadiradze tried to "sharpen" the rocket, but nothing came of it. The variant with the missile, divided into two blocks, the docking of which should have been made before launch, was also not realized. The only way out was to lift the container with the rocket above the landing gear. Which they did. But after that there was a problem with the passage of the installation under the bridges. We decided to do it, having made the system of regulation of the "product" in height. If necessary, the driver directly from the cab made the "growth" of the AAP lower and freely traveled under the bridge. In September 1987, comparative tests of prototypes of special wheeled conveyors of high cross-country ability and especially large carrying capacity of MAZ-7906 and MAZ-7907 were successfully completed. The MAZ-7906 mileage was 3780 km (the maximum speed was 30 km / h), and the MAZ-7907 was 2054 km (the maximum speed was 25 km / h).
The results obtained during the tests of the chassis fully met the extremely high requirements of the technical assignment. The conclusions of the commission recommended the production of the MAZ-7907 chassis, which had a number of advantages over the MAZ-7906: axial loads and control, acoustic qualities and vibrations of the triple cab, readiness for movement in negative temperatures, operational technology, greater reliability and survivability for the account of redundancy of electric transmission systems and the possibility of movement without 8 (!) electric drives, transportability in rail transport.
During the tests, the test specimens of MAZ-7906 covered about a thousand kilometers. Pilot rides were performed at night - the giants drove off the Mogilev highway and Utios factory site. After the tests, the chassis was dismantled and transported by rail to Volgograd. The MAZ-7907 test runs began in 1986. September Before that, large-scale infrastructure projects were launched: special hangars were built, a special test strip with bridges and intersections, where the impact of the wheels on the road pavement was studied. Tests were completed September in 1987, by the time the MAZ-7907 had covreed 2054 km, with a maximum developed speed - 25 km/hr. After the vehicle was driven at a speed of 20 kilometers per hour for 250 kilometers, the vehicle body was anchored as a result of the damage and eventually had to be dragged back to the factory.
The notorious perestroika-catastrophe began, and the work on the complex was stopped. Due to the complexity of operation, the mobile ground-based complex was not adopted for service. This seemed to be a bit sad ending.
Both MAZ-7907 cars were returned to the plant, where they are still in various degrees of "disassembly". In 2006, two elements of two MAZ-7907 units were assembled together, awaiting further restoration at the factory at Minsk. That chassis is supposed to become one of the elements of the factory’s museum exposition. The MAZ-7906 chassis was less fortunate. One of them was taken for experimental work by the Moscow Institute of Heat Engineering, and its fate is unknown. The other, unnecessary, was cut up for scrap in Minsk.
|Type of ground mobile||Chassis MAZ-7907|
|Chassis designer||SKB MAZ (MZKT)|
|Ch. constructor chassis||B.L.Shaposhnik, V.E.Chvyalov|
|Curb weight||65.8 tonnes|
|Full weight, t||250|
|Carrying capacity, t||150|
|Number of axles||12|
|Wheel formula||24 x 24|
|Wheelbase (front part)||9065 mm|
|Wheelbase (rear part)||9220 mm|
|Track of all wheels||3330 mm|
|Ground clearance||485 mm.|
|Turning radius||27 meters|
|Type of engine||gas turbine GTD-1200A (»product 40") with electric transmission on 24 motor wheels with synchronous AC motors|
|developer plant||imeini V.Ya.Klimova|
|manufacturer||f Kaluga Engine Plant|
|Maximum power, hp.||1250|
|Top speed||40 kph|
|Number of missiles on TU||1|
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