200 mm MD-20-F high explosive projectile

Схема 200-мм фугасного реактивного снаряда МД-20-Ф

  1. the fuse;
  2. the head end;
  3. projectile index;
  4. the number of the shell plant;
  5. lot number and year of equipment;
  6. explosive cipher;
  7. centrifugal thickening;
  8. brand of pyropropatron;
  9. gunpowder brand;
  10. lot number of powder charge, year of manufacture of powder, powder plant cipher;
  11. ballistic index (N of the firing tables);
  12. missile part;
  13. lot number and year of assembly of the projectile, number of arsenal, base, warehouse or assembly plant;
  14. lot number of missile parts, year of manufacture;
  15. head unit body;
  16. bursting charge;
  17. tetrile draughtsman;
  18. trotyl draughtsman;
  19. locking screw;
  20. bottom;
  21. candle;
  22. holder;
  23. ignitor;
  24. centering ring;
  25. powder breadcrumbs;
  26. chamber;
  27. gunpowder charge;
  28. stabilizer;
  29. aperture;
  30. nozzle block;
  31. sealing nozzle plate;
  32. snap ring;
  33. drive pin;

The MD-20-F high-explosive rotating in flight jet projectile has an extended range of fire and an enhanced blast charge. It consists of the main 2 and 12 rocket parts. The blast chamber is a streamlined metal case 15 with a bottom 20 filled with TNT, for detonation of which the head fuse VD-20 is used, additional detonator made of Tetril 17 and two Tetril 18 draughts. The VD-20 fuse has three settings: "O" for instant action, "M" for low deceleration and "B" for high deceleration. The rocket engine consists of a chamber 26, powder charge 27, ignition 23, holder 22 with a centering ring 13, two candles 10, a retaining ring 20 to press the stabilizer. The chamber has two centering nodes 7. At the front there are two candles 21, and at the rear there is a leading pin 33, which enters the spiral guide and rotates the rocket during its descent from the launcher.

Unlike the previous rockets in MD-20-F powder charge is made in the form of one thick-water cylindrical checker with a central channel and armored ends. Inside the chamber the charge is fixed by means of dryers 25. The igniter 23 has an aluminum shell, is placed in the bottom part of the rocket engine and is filled with coarse-grained smoke powder. The aperture 29 fixes the powder charge in the chamber during the initial period of combustion and also prevents the unburned part of the charge from being ejected through the engine nozzles. Nozzle block 30 contains six peripheral and one central nozzle. The axes of the peripheral nozzles are tilted at an angle of 5° to the longitudinal axis of the missile, which ensures the rotation of the missile in flight and increases the hecticity of firing.

The rocket engine is launched by the fire control device by applying an electrical impulse to the pyro-candlelit cartridges 21. The fire beam of the pyropropatron ignites the powder of the bottom igniter, which causes the main charge of the rocket engine to burn. The projectile overcomes the force of the locking mechanism and leaves the guiding device.

Tactical and technical characteristics

Caliber, mm 200
The length of the projectile with the fuse, mm. 3040
Weight of final projectile, kg 194
Weight of explosives, kg 30.08
Powder charge weight, kg 52.1
Weight of gunpowder in the ignition, kg 0.18
Powder charge combustion time at temperatures between -40° and +50° C, s 5.6-3
The length of the active section of the trajectory at charge temperatures of -40 to +50°C, m 1275-825
Highest projectile speed at charge temperatures from -40 to +50°C, m/s 535-590
Rate of projectile discharge from the guide rail at gunpowder charge temperatures from -40 to +50°C, m/s 22-34
Range of fire under normal conditions, m 18750
Closure weight, kg 90
Funnel diameter at medium ground density (fuse at "B", elevation angle 45°), m 5.5-6.0
The depth of the funnel, m 2.9-3.1
The volume of the funnel, m3 30-40