The main aim of upgrade is to:
• Enhance technical characteristics and combat capabilities;
• Improve fuel distance and cross-country capability;
• Increase carried ammunition set;
• Reduce time required for combat vehicle reloading;
• Reduce the number of vehicles used for carrying ammunition;
• Enable leveling of the platform and turret stabilization when firing;
• Improve fire accuracy and grouping;
• Increase range and reliability of the combat vehicle radio communication;
• Replace obsolete vehicle chassis URAL-375;
• Mount the turret on the modern all-wheel-drive vehicle chassis MAZ-6317054;
• Mount racks for rockets storage and transportation on the chassis platform which enables combat vehicle to carry two salvos.
List of works on upgrade of the combat vehicle BМ–21:
• Dismounting of the combat vehicle turret and its units, mechanisms as well as mounting sets from URAL-375 chassis.
• Dismounting of the sets of ammunition racks from transloaders.
• Manufacture of MAZ-631705 vehicle chassis for mounting the turret.
• Works on overhaul (medium repair) on the turret, set of launching tubes, power supply unit, electric-power drive, sighting devices, units, mechanisms and pneumatic equipment.
• Manufacture of switching panels, accessories, sight bracket, electric-installation sets, gunner platform, mounting and fastening elements, covers, tents required for mounting the turret on MAZ-631705 chassis.
• Modification of the turret and its parts, units, mechanisms, devices, mounting sets, SPTA boxes and their mounting on MAZ-631705 chassis.
• Repair, modification and mounting of racks on the combat vehicle.
• Testing, alignment, functional checks.
• Trials of the combat vehicle.
Technical specifications
Сaliber, mm
|
122
|
Number of launching tubes
|
40
|
Firing range, m:
|
- ordinary projectile
|
20450
|
- projectile of extended range
|
up to 50000
|
Full salvo time, s
|
20
|
Maximum elevation angle, deg
|
55
|
Minimum elevation angle, deg
|
0
|
Traverse, deg:
|
- RH from the vehicle chassis
|
70
|
- LH from the vehicle chassis
|
102
|
Cabin bypass angle, deg
|
±36
|
Minimum elevation angle of launching tubes in the cabin zone, deg
|
20
|
Length in travel position, mm
|
9450
|
Width in travel position, mm
|
2710
|
Height in travel position, mm
|
3410
|
Height at maximum elevation angle, mm
|
4530
|
Carried ammunition set, pcs
|
80 (100)
|
Combat vehicle reloading time, min
|
7
|
Weight of combat vehicle without ammunition and crew, kg
|
13300
|
Curb weight, kg:
|
- with 40 rockets in launching set
|
16340
|
- with 40 rockets in launching set and 40 rockets on the racks
|
18980
|
- with 40 rockets in launching set and 60 projectiles on the racksс
|
20300
|
Maximum travelling speed of the combat vehicle at curb weight, km/h
|
up to 75
|
Fuel distance, km
|
1000
|
Maximum fording depth, mm
|
1750
|
