11D425A Rocket Engine

Scale model
Date of appearance: 1979
Developer: KB KhimMash
Manufacturer: KB KhimMash
Made in: Kaliningrad, USSR
Scale: 1:1
Dimensions: 7900 × 1420 × 2179 mm
Weight: 65 kg
Materials: steel
Tags: cosmos, birthofnewage, polytech, space, translate


The liquid propellant rocket engines from the series 11D425 were developed and built by the KB KhimMash (Isayev Chemical Engineering Design Bureau). They were used in the design of unmanned interplanetary space stations in the «Venus» and «Mars» space programs. The main objective of the engines was the trajectory correction and deceleration of the stations. Presented here is the 11D425A modification with a thrust of up to 2000 kgf used in the devices of the M-73 series, which finally became the missions «Mars-4» — «Mars 7». Their task was to create an artificial satellite of Mars and deliver the lander to its surface. All four stations successfully reached Mars, but only two of them managed to carry out their mission: «Mars 5» was launched safely into the orbit of the Red Planet, and «Mars 6» touched down on the surface and completed its scientific program.

11D425A Rocket Engine
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