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Vostok-2M
	Vostok-2M rocket
Function	Carrier rocket
Manufacturer	OKB-1
Country of origin	USSR
Size
Stages	Two
Capacity
Payload to SSO
Mass	3,800 kilograms (8,400 lb)
Associated rockets
Family	R-7
Launch history
Status	Retired
Launch sites	Baikonur, Site 31/6; Plesetsk, Sites 41/1, 16/2, 43/3 & 43/4
Total launches	93
Success(es)	92
Failure(s)	1
First flight	28 August 1964
Last flight	29 August 1991
Type of passengers/cargo	Meteor; Resurs; Tselina-D
Boosters
No. boosters	4
Powered by	1 RD-107-8D74K
Maximum thrust	995.3 kilonewtons (223,800 lbf)
Burn time	120 seconds
Propellant	RP-1/LOX
First stage
Powered by	1 RD-108-8D75K
Maximum thrust	940.4 kilonewtons (211,400 lbf)
Burn time	305 seconds
Propellant	RP-1/LOX
Second stage
Powered by	1 RD-0109
Maximum thrust	54.52 kilonewtons (12,260 lbf)
Burn time	400 seconds
Propellant	RP-1/LOX
	[edit on Wikidata]

The Vostok-2M (Russian: Восток, lit. 'East'), GRAU index: 8A92M was an expendable carrier rocket used by the Soviet Union between 1964 and 1991. Ninety-three were launched, of which one failed.^[1] Another was destroyed before launch.^[2] It was originally built as a specialised version of the earlier Vostok-2, for injecting lighter payloads into higher Sun-synchronous orbits. It was a member of the R-7 family of rockets, and the last Vostok.

The Vostok-2M was similar to the Vostok-2 booster but the adapter portion of the Blok E stage remained attached to the payload and the guidance system was modified specially to assist in putting payloads in sun-synchronous orbits. Vehicles flown in 1967 and later used the 8D74M engines or the 11D511 in 1973 and later.

The Vostok-2M made its maiden flight on 28 August 1964 from Site 31/6 at the Baikonur Cosmodrome, successfully placing Kosmos 44, a Meteor weather satellite into orbit. A total of 93 were launched from 1964 to '91. Its only launch failure occurred on 1 February 1969, when the launch of a Meteor failed due to an upper stage problem.

At 16:01 GMT on 18 March 1980, a Vostok-2M exploded during fueling at Plesetsk Site 43/4, ahead of the launch of a Tselina-D satellite, killing 48 people who were working on the rocket at the time. A filter in a hydrogen peroxide tank of the third stage had accidentally been soldered with lead instead of tin, with the catalytically active lead solder on the filter causing the explosion upon contact hydrogen peroxide.^[3] As a consequence, the H₂O₂ broke down, overheated, and melted the solder, causing pieces to fall into the H₂O₂ storage tank and cause a runaway chemical reaction. This led to a fire inside the third stage and eventual explosion which resulted in the complete destruction of the launch vehicle and severe pad damage (LC-43 did not host another launch for three years).

Vostok-2M launches occurred from Site 31/6 at Baikonur, and Sites 41/1, 16/2, 43/3 and 43/4 at Plesetsk.^[1] The Vostok-2M was retired in 1991 in favour of standardization on the Soyuz-U and U2 rockets. The final flight was conducted on 29 August and carried the IRS-1B satellite for the Indian Space Research Organization.

References

^ ^a ^b "Vostok-2M (8A92M)". Gunter's Space Page. Retrieved 2023-10-23.
^ Wade, Mark. "Vostok 8A92M". Encyclopedia Astronautica. Archived from the original on 2009-03-06. Retrieved 2009-04-15.
^ Boris Yevseyevich Chertok (2006-06-01). Rockets and People: Creating a rocket industry (PDF). Government Printing Office. pp. 636–640. ISBN 9780160766725.