Strela-10: Guarding the Sky for Half a Century
A Strela-10MN air defense missile system during exercises. Photo: Russian Ministry of Defense
In 1976, a new anti-aircraft gun was adopted for service with the Soviet Army's air defense forces. missile The 9K35 Strela-10 air defense system. This air defense system has subsequently undergone various upgrades, ensuring it remains in service and maintains its high potential. Several technical and other factors have contributed to its longevity.
Long story
The advanced 9K35 air defense missile system was developed in the late 1960s to replace the existing Strela-1 system in the armed forces. The lead developer of the new project was the Precision Engineering Design Bureau, headed by A.E. Nudelman. A number of related companies also participated in the work.
In early 1973, the first prototype of the new SAM system, designated Strela-10SV, was sent for testing. Overall, it performed well, but some improvements were needed. The second phase of testing took place in 1975-76 and was successful.
In March 1976, the 9K35 system and the 9M37 surface-to-air missile were officially accepted into service. Several enterprises launched serial production of the entire SAM system and its various components. During this same period, the first serially produced units were delivered to the troops, replacing obsolete equipment.
A 9A35 combat vehicle without missiles. Photo by Vitalykuzmin.su
As early as 1979, the modernized 9K35M Strela-10M air defense system, armed with the 9M37M missile, was accepted into service. Two years later, a modification designated "M2" appeared. By the late 1980s, work on the 9K35M3 was completed. Each new modification followed one another in production.
After the collapse of the USSR, despite all the restrictions, the Tochmash design bureau continued to develop the Strela-10. In the mid-2000s, the Strela-10M4 system was introduced. Its further development led to the Strela-10MN air defense system. The army accepted it into service in 2015.
In 2020, modernization work on the 9M333 guided missile was completed. This version has entered serial production and is being delivered to the troops. These SAMs are compatible with current modifications of the Strela-10 and are actively used in the current Special Operation.
Apparently, this is where development of the 9K35 line will stop. In the 2010s, the Tochmash design bureau and its subcontractors began developing a new air defense system of a similar class, the Sosna. These systems are expected to replace all versions of the Strela-10 still in service. Thanks to new components and features, the Sosna should demonstrate superior technical and combat performance, as well as offer other advantages.
The air defense system in combat mode. The operator is visible at his workstation. Photo by Vitalykuzmin.su
Basic configuration
It's worth recalling the Strela-10 air defense system's capabilities and characteristics at the time of its development. This will allow us to understand which features and characteristics of the system have been retained throughout successive upgrades, and what had to be modified or redesigned.
9K35 "Strela-10SV" is a short-range self-propelled air defense system designed for military DefenseIts basis is the 9A35 combat vehicle. It is built on the MT-LB armored tracked carrier and features a specially designed fighting compartment/launcher with all necessary components.
The chassis body protects the crew and units from small arms fire weapons and shrapnel. The chassis ensures high mobility on the road and off-road, and also allows for swimming across water obstacles. The Strela-10 can accompany troops on the march without restrictions.
The launcher is designed as a rotating turret with a gunner/operator station. Externally, it is equipped with oscillating devices with mounts for four missile containers and an antenna for the so-called area assessment equipment. The operator observes the airspace through the windshield. The turret can be rotated for preliminary targeting using electric drives or manually. The area assessment equipment allows for precise target location and missile launch timing.
Handling ammunition. Photo: Russian Ministry of Defense
The 9M37 SAM is a 2,2-meter-long, 120-mm-diameter canard-designed munition. It is propelled by a solid-fuel motor. Its flight speed exceeds Mach 1,5, and its launch range reaches 5 km. The missile is equipped with a dual-channel seeker with both photocontrast and infrared modes. An infrared seeker was also considered as a secondary option.
Ways of development
The 9M37 missile's basic configuration had limited combat capabilities. Therefore, it was significantly upgraded as part of the Strela-10M project. A new infrared seeker with improved operating algorithms was added. Other components of the system were also slightly modified based on testing and operational experience.
The 9K35M2 project introduced target acquisition and designation equipment. This simplified the process of receiving air situation and target information from higher command posts. Furthermore, the 9A35 combat vehicle received floats, improving its mobility on water.
The Strela-10M3 SAM system received the new 9M333 missile. Its design and basic characteristics were essentially unchanged from previous SAMs. However, the component base was radically updated, leading to improvements in several critical parameters affecting interception success. The 9M333 SAM was recently further improved, achieving improvements in several parameters.
Two missile launchers and an antenna for the automatic zone assessment system. Photo: Russian Ministry of Defense
The modern Strela-10M4 and Strela-10MN projects included upgrades to the combat vehicle's onboard electronics. For example, the 9K35M4 SAM system received a fully functional optronic system with day and night channels, improving target search and tracking capabilities. An automatic target tracker was also introduced. The MN project continued this development logic with the use of modern instruments.
Factors of success
It's easy to see that the Strela-10 air defense system's long service life was made possible by a series of successive upgrades. At least every few years, new projects of this kind were developed, introducing various changes to the original design, components, and so on. Thanks to these measures, the system's key characteristics and combat capabilities remained at the required level.
Significant potential for modernization was already evident during the development of the overall technical design of the air defense system. The developers of the future 9K35 found the optimal architecture for the system. Initially, it enabled the creation of a system with the required capabilities, and later, it allowed for the replacement of components and/or the installation of new ones. Furthermore, they selected a successful chassis and independently developed a number of new products, such as the 3M37 SAM.
Some modernization projects involved re-equipping the combat vehicle. Over time, the 9A35 received new electronic equipment, a fully functional electronic system, modern communications and control systems, and more. Mobility was also improved, with the addition of additional floats. As a result, the latest modifications of the Strela-10 can effectively operate in modern environments and fulfill their missions.
The modern 9M333 SAM. Photo by Kalashnikov Concern.
The upgrades also simplified crew operations and combat missions. For example, the operator of the original 9K35 air defense system had to visually monitor the air situation and independently search for targets to engage. This process was subsequently automated and simplified, both through a target acquisition system and through the use of a 24-hour operational electronic system.
In parallel, munitions for air defense missile systems were developed, with some of these projects requiring significant redesign of the missile. For example, the 9M37M project replaced the original seeker, and later, an entirely new SAM was developed. The resulting 9M333 missile still maintains the required performance level, and its modernization allows for improvements to the overall performance of the system.
Half a century in service
Thus, during the initial design stage at the Tochmash Design Bureau, successful and promising technical solutions were identified that determined not only the design of the future Strela-10 but also the possibilities for its further development. These were almost immediately used in the development of the first modernization projects.
These processes subsequently continued, and their final results became apparent in the last decade. The latest modification of the Strela-10MN system entered service with our army, boasting significant differences and advantages over the baseline 9K35. This demonstrates that the original design's modernization potential was fully utilized.
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