Main new rocket parts:

• Propellant grain
• Combustion chamber
• Motor igniter assembly
• Motor closure
• Parts for thermal isolation

Main existing rocket parts:

• Warhead with fuse
  • Nozzle assembly with fins • Rocket guide
  • Contact cover
  • Packing of the rocket

The modification is primarily made in the propellant grain. The new propellant grain is in one piece, star shaped and inhibited along the outer surface at one end. The rocket propellant used in its production is the modern thermoplastic composite propellant made according to the original technology. The propellant has a similar burning temperature as the original one, but has a higher specific impulse, which enables the use of the original nozzle assembly. The propellant grain is not bounded to the new motor combustion chamber, which enables the overhaul of the rocket to be performed at the premises of the End User.

The overhaul of the rocket is quick and easy without requiring any special technology or machinery. By using a large number of components from the existing rockets with expired propellant grain life, the overhaul saves a lot of money if compared to supply of new rockets.

MRV-U fuze

The fuse is armed at distances of  150-450 m.

The nature of the projectile’s effect on the target depends on the installation of the fuse:

• in SQ, it is predominantly fragmentation,
• in Delay it is mainly high-explosive.

In terms of fragmentation, the warhead of the M-21OF shell is twice as effective as the M-140F, and in the high-explosive part it is only 1.7 times more efficient