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11D82M
Solid propellant retrorocket developed for the Zenit series of recoverable reconnaisance satellites. The motor was developed to replace the liquid propellant motor used in Vostok and earlier versions of Zenit. The installation was interchangeable. In the 22 May 1959 government decree that gave the go-ahead for the Vostok program both Isayev's OKB-2 and the NII-125 design bureau of Boris Zhukov were tasked with developing deorbit engines for the various Vostok versions. OKB-2 was to develop a liquid-propellant engine and NII-125 a solid-propellant engine. Korolev decided to use the liquid-propellant engine both on the manned vehicle and the first spy satellite version (Zenit-2). This engine was initially known as S5.4, but received the military index 8D66 after Zenit-2 was declared operational. Series production of the engine was turned over by OKB-2 to the Zlatoust Machine Building Factory, where it was manufactured until 1975. In 1974 forty engines were produced and stored with a storage lifetime of 10 years.

The liquid propellant engine was used by Zenit-2, Zenit-4, Zenit-2M and Zenit-4MKM, with its last flight with Cosmos 1214 in 1985 . A new Isayev engine (11D452) was introduced on Zenit-6 and a slightly modified version of that (11D452A) flew on Zenit-6U and presumably also on Zenit-8.

When OKB-1 finished the preliminary design for Zenit-4 in 1964, the idea was to introduce the NII-125 solid-fuel engine on the series production versions of the satellite. The solid-fuel engine made a test flight on Cosmos 69 (a Zenit-4) in June 1965, but didn't fly again until October 1968 (Cosmos 251, the first Zenit-4M). The solid-propellant engine flew on Zenit-4M, 4MT and 4MK.

Country: Russia. Propellants: Solid. Agency: NII-125.
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