The RPK-8 has a response time is 15 seconds, with a single-salvo kill probability of 0.8. A single 90R projectile weighs 112.5 kg, including its 67 kg gravitational projectile, and 19.5 kg warhead.

The same missile casing is used on the Magnesit-MN. That system is tasked with creating false targets for acoustic-guided enemy torpedoes. It has the same 4.3 km range, and weighs 115 kg. Its acoustics systems were developed by the St. Petersburg-based Akvamarin Corporation.

Tuchkov writes: "After splashdown, the projectile sinks to a depth of 25 meters, and produces interference for a period of eight minutes, enough time to counter an enemy torpedo attack. The Magnesit-MN is capable of operating in two modes – as a generator of interference for guided torpedos, and as an imitator of acoustic signals typical for surface ships. In the first case, enemy torpedoes are disoriented; in the second, they rush to a false target –i.e., to the Magnesit-MN."

Furthermore, the analyst explained that the Magnesit-MN's interference-generating systems can be used without the missile shell, dropped into the water by helicopter, for example.
Ultimately, Tuchkov emphasized that at their core, the RPK-8 and its 90R, 90R1 and Magnesit-MN projectiles are a ship defense system designed for close-quarters combat. 

"However, offensive weapons designed to destroy subs at great distances also exist, and can be based on a variety of platforms, including ships, subs, and aircraft," the analyst added. Among them is the 91R1 Kalibr, launched from a submerged position from depths of up to 150 m. 

"The rocket is fired from a standard 533 mm torpedo tube. Its exits the water using a solid propellant accelerator. Then the main engine is turned on. The missile is guarded to its target using an inertial guidance system. In its anti-submarine missile capacity, its payload is carried in a mini-torpedo. When the missile reaches the point specified in its flight program, the torpedo disconnects and parachutes down to sea level, turns on its engine and begins its search for the target with the aid of sonar."

The 91R1 has a maximum flight range of 50 km, and a speed of 700 m/s (top-notch in this class of weapon). Prelaunch preparation time is 10 seconds. One salvo can launch four missiles. The homing sonar is capable of detecting targets at distances up to 2 km.
For comparison, Tuchkov noted that the equivalent US anti-submarine missile is the Lockheed Martin RUM-139 VLA, which entered into service in 1996. Installed aboard surface ships, that missile has a range of 28 km, a flight speed of 330 m/s, and uses inertial guidance. The Mk-46 torpedo is its standard warhead – introduced into the Navy in 1964 and upgraded five times since.

"However, all of these upgrades did not bring it up to par with the APR-3 Orel ('Eagle') torpedo used in the Russian 91R1," the analyst wrote. "The maximum speeds are incommensurable – 65 vs. 45 knots. Maximum depth is too – 800 vs 450 m. The Orel also has a higher range. All of this is predetermined by the fact that the 91P1 has a starting weight of 2,100 kg, while that of the RUM-139 VLA is 640 kg."

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