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Fighting vehicle BM-31-12

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    Basing

    :

    chassis

    management system:

    Uncontrolled

    Warhead:

    -explosive

    Application:

    Multiple rocket launchers

    Country:

    Russia

    Range:

    4 km.

    year development:

    1944

    fighting machine BM-31-12 A significant achievement specialists SKB factory "Compressor" was the creation in March 1944, 12-charging combat vehicle with launcher mounted on a truck chassis modified Studebaker, designed to start unguided shells of M-31 caliber 300 mm. She received the designation BM-31-12.

    distinctive feature of the BM-31-12 was launching unguided missiles no capping of transport, and a specially designed welded package - the so-called cell guides. The design of the launcher were laid new technical solutions for the implementation of start: block and locking of unguided missiles in the guide, a fundamentally new electrical and others. All this has enabled dramatically improve combat and operational quality of the installation.

    For locking

    projectile motion rail combat vehicle was developed a special device consisting of upper and lower cross bars with pads for securing the front of the projectile in the stowed position, the two rear folding grilles with tareli and tensioning devices for securing the projectile from the nozzle exit and leverage, allowing lower or lift reclining lattice and thereby lock the release or shells. At the same time it served as a locking device, eliminating the automatic restart of the projectile in the stowed position.

    Test BM-31-12 with cell guides to determine combat effectiveness, strength, stability, and when shooting in the stowed position, easy loading and maintenance, correct placement of the individual components and mechanisms conducted in April-May 1944 and showed its high specifications. The report landfill, in particular, noted that the shooting of the BM-31-12 M-31 shells and safe as possible when the shooting in the cockpit, and outside it. BM-31-12 is resistant not only lowered when the jack, but when raised.

    Create

    12-charging BM-31-12 with cell guides was an important contribution to the development of a missile launch technology, because none existed a similar setup to start unguided missiles such a large caliber. Its creation has led to a significant increase in efficiency of use of missile weapons. Compared with launchers machines increased mobility, improved accuracy of fire, it was possible to shoot in a wide range of elevation angles (from +10 º to 45 º).

    According to the Decision of the State Defense Committee GFCS number 6029ss from 9 June 1944 adopted Guards mortar units adopted dvenadtsatizaryadnaya installing the M-31 design Barmina mounted on a chassis and designed to fire shells of M-31-CC increased accuracy .

    With the adoption of service in April 1944, BM-31-12, which is before the end of the Great Patriotic War was a major Guards mortar firing 300-mm unguided rockets M-31 (balisticheskie index 53-F-972) and M-31-CC (balisticheskie index 53-F-973), ending phase of the SKB factory "Kompressor" machines and systems for starting NURS with warheads increased lethality.

    After the war

    launcher was mounted on a modified chassis truck ZIS-151.

    In embodiments

    fighting vehicles were the following differences:

    Stretcher combat vehicle BM-31-12, mounted on the chassis Studebaker differed from subframe BM31-12 on ZIS-151 chassis that he was shorter on one section and not up into the cab, leaving space on the chassis side members for placing the gas tank.

    device rotating mechanism combat vehicle BM-31-12, mounted on the chassis of the Studebaker, differs from the rotating mechanism of BM-31-12 on the chassis of the ZIS-151 except that it lacked foldaway handle. On the left end of the screw was put in place an elongated handle folding plain leather and secured with a taper pin.

    protection device cab and fuel tank, fenders and mounting entrenching tool in fighting machine BM-31-12, mounted on the chassis Studebaker structurally different from the respective nodes combat vehicle, mounted on the chassis of the ZIS-151, due to the structural differences of both types of chassis.

    protection cabin equipped chassis cab protection differed from the chassis equipped with VMS-151 only by the size of the mating parts and cab form locking devices for securing the shield in its stowed position.

    Because Studebaker chassis had only one tank and one spare wheel, fuel tank protection design has the form shown in the figure. In this spare wheel is attached to the right side of the fuel tank protection on two studs with two special nuts.

    Wings 2 (see figure) equipped chassis Studebaker had rounded front and rear, and they were less durable in operation than the wings equipped with ZIS-151 chassis.

    Gardening tools to combat vehicle BM-31-12 was mounted on the chassis Studebaker follows:

    shovel and saw on the back sheet cab protection;

    pick-hoe on the back sheet protection of the fuel tank;

    ax on the back sheet protection of the fuel tank.

    Boxes for spare parts and batteries for combat vehicle BM-31-12, mounted on the chassis of the Studebaker, had the same structure as the boxes combat vehicle BM-31-12, mounted on the chassis of the ZIS-151.

    Fighting vehicle BM-31-12, mounted on the modified for mounting artillery unit Studebaker truck chassis, when loading in the stowed position on the railway platform go beyond the envelope of the rolling stock "0" on the top package 210 mm and by rail with envelope "0" could only be transported with wheels removed the rights of oversized cargo.

    fighting machine BM-31-12 The general form of the BM-31-12 (side view, in the stowed position):

    1 - package guide cells;

    2 - Farm;

    3 - turning mechanism;

    4 - Linkage;

    5 - swing frame;

    6 - console sight;

    7 - sight;

    8 - Jacks;

    9 - shutoff mechanism;

    10 - wings;

    11 - bracket;

    12 - cab guard.

    PERFORMANCE

    Basic data

    combat vehicle BM-31-12

    Sizing war machine

    The number of guide

    12

    length guide, m

    3,0

    highest elevation, hail

    +48

    lowest elevation, hail

    +10

    traverse, hail

    ± 10

    force on the handle of the lifting mechanism, kg

    10

    force on the arm pivoting mechanism, kg

    8

    Weights war machine

    (Studebaker chassis)

    Package Weight guides kg

    600

    Weight artillery unit, kg

    2000

    Weight BM in the stowed position, kg

    5300

    BM Weight in firing position, charged with 12 shells, kg

    6400

    Overall data

    war machine

    (chassis Studebaker stowed)

    Length, m

    6,2

    Width, m

    2,4

    Height, m

    3,2

    Operating Data

    Transfer time from traveling to combat, min

    3-5

    time required for loading the BM, min

    10-15

    time required to produce the volley with

    7-10

    Basic data

    combat vehicle BM-31-12

    (modified chassis truck ZIS-151)

    Number of launching tubes

    12

    length guides, mm

    3000

    highest elevation, º

    +48

    lowest elevation, º

    +10

    traverse angles in the range, º

    ± 10

    greatest force on the handle of the lifting mechanism, kg

    Prior

    12

    greatest force on the handle of the rotary mechanism, kg

    Prior

    10

    Package Weight, kg

    700

    Weight artillery unit, kg

    2170

    Weight fighting machine in the stowed position, kg

    7100

    weight combat vehicle in a combat situation (with 12 rounds), kg

    8500

    Length, stowed, mm

    7000

    Stowed Width, mm

    2500

    Height Stowed mm

    3000

    Transfer time from traveling to combat, min

    3-5

    time required for loading the combat vehicle, min

    10-15

    time required to produce the volley with

    7-10

    Brief operational and technical characteristics of cars Studebaker

    General information

    Payload chassis, t

    2,5

    Number of driven axles

    3

    Fuel consumption per 100 km, kg

    30,4

    Cruising on the motorway, km

    250-280

    Clearance

    248

    Minimum turning radius, m

    10

    Engine Type

    Hercules 4-stroke

    Cylinders

    6

    Maximum power l. with.

    95

    speed at maximum power, rev / min.

    2500

    voltage electrical circuit, in

    6

    Tanks

    fuel tank, l

    150

    Cooling Systems, l

    18,5

    engine lube l

    7,5 (with filter 7,62)

    applied lubricants

    Fuel

    Petrol

    KV-70, B-70; leaded gasoline with the end point of not more than 220 º C

    Engine Lubrication summer

    Diesel oil

    winter; avtol 10 (sulfuric acid or selective treatment); imported oil M-160 or M-30

    Engine Lubrication winter

    Lubriketing; avtol 4 or 6 (sulfuric acid or selective treatment); imported oil M-120

    adjusting data

    The deflection

    fan belt mm

    12-20

    size tires, DCU

    7,5 × 20

    pressure tires, atm.

    3,85

    Free

    brake pedal, mm

    12-15

    free travel, mm

    12-20

    convergence of forward wheels, mm

    1,5-4,5

    Firing order

    1-5-3-6-2-4

    oil pressure when the engine is warm medium speed not lower funt/dyuym2

    26

    Valve clearances when the engine is warm, mm

    0,15-0,18

    Spark candles mm

    0,6-0,65

    gap between the breaker contacts, mm

    0,45-0,65

    coolant temperature, º F

    140-180 º

    Ammunition

    M-31

    M-31-CC

    Caliber, mm

    300

    300

    Wingspan stabilizer mm

    300

    300

    Full length projectile (without fuse) mm

    1760

    1760

    Curb Weight

    finally projectile, kg

    92,4

    94,8

    type warhead

    -explosive

    -explosive

    curb weight of the warhead kg

    52,4

    52,4

    weight bursting charge, kg

    28,9

    28,9

    Weight missile unit, kg

    39,6

    42

    Weight of powder charge, kg

    11,25

    11,25

    Blaster

    GVMZ

    GVMZ

    resistance bridge incandescent igniter ohms

    1,0-1,4

    1,0-1,4

    amperage required for ignition igniter, A

    Equally

    0,5

    Equally

    0,5

    balisticheskie data

    Time

    burning rocket charge, with

    0,9

    0,9

    average reactive force, kg

    2500

    2500

    Average velocity projectile m/s2

    285

    275

    Muzzle velocity, m / s

    35

    35

    Length

    active portion of the trajectory, m

    115

    115

    highest velocity, m / s

    255

    245

    Most

    range, m

    4325

    4000

    tests and operation

    note that 14 years after the end of World War II, in the course of work on the development of an engine for projectile " Millennium remote mining ", in his letter (ref. 5 / V '59) Director NII-582 of the State Committee of the Council of Ministers for Defence Technology Comrade. Chichkova SI (1 Balashikha, Moscow region) Deputy Director for Science of the SRI-147 (now the Federal State Unitary Enterprise "SSPE" Fusion "(Tula) Alexander N. Ganichev reported:" ... Recommended for non-rotating version feathered projectile launchers apply guides projectile M-31 / BM-31-12 / what is necessary to change the cartridge diameter 300 mm. ".





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