In May 1942, SKB Compressor Plant Design Group VA Rudnicki on the instructions of the General Directorate of arms Guards mortar units developed a special launcher frame type - starting the machine M-30 for 300-millimeter rockets M-30. For the basis of this very simple launcher were taken German propelling devices arr. 1940 and 1941. , Of which the Germans shot 28-cm and 32-cm rockets.
machine M-30 when shooting set directly on the ground and placed him in a special four rockets capping (Box 30). Inside the box were guiding bands for which the shell slid the shot. This capping missiles do to factories and warehouses, and run from it. Then, on the proposals from the front-row CSC was developed way of loading, allowing each machine with M-30 start 8 shells Such machines began to come to the front in the spring of 1943. Volley density had doubled.
To start implementation on the inner surface of the closure were longitudinal wooden bars studded metal strips, which slid Rockets at start. With the end of the closure had removable bottom to ensure smooth exit of the projectile during firing. The machine was made of a light tilt frame of steel angles. On the frame in a row stowed and secured with removable capping four ties with shells of M-30. Frame, had the lower part of the openers, retaining its offset from the volley. In front of the frame had removable vertical support that gave the necessary frame for firing angle of elevation. The line of fire was set during the installation of the frame in position. Shooting was conducted by applying a pulse of electric current to the projectile through the wires from the twin blasting machines. Machine tools caseloads launchers through Electricity device (Crab). When changing positions launchers machines manually loads and transported on board conventional cars.
machines as starting devices have several advantages: simple structure, low cost, easy loading process. But there were significant drawbacks: low mobility and complexity of horizontal and vertical guidance in the charged state, lack of precision aiming, enables emergency descent of the projectile from the infatuation for a flight Loose capping. Short length guides led to an increase in scattering shells. Installing frames in position, assembling them capping with shells, mountings, wiring connection, Pridacha elevation, etc. required considerable work. Due to the relatively small range of shells of M-30, the position of plants chosen close to the front line, increasing the likelihood of their detection and destruction of the enemy.
By order of the State Defense Committee on June 8, 1942 after a successful field tests launcher M-30 machine was adopted for and put into production. Machines M-30 is widely used in 1942-1943 on all fronts at the breakthrough.