Molniya-M carrier rocket
|Function||Medium carrier rocket|
|Country of origin||Soviet Union|
|Height||43.44 m (142.5 ft)|
|Diameter||10.3 m (33.8 ft)|
|Mass||305,000 kg (672,000 lb)|
|Launch sites||Baikonur, Plesetsk|
The 8K78 resulted from a crash program by the Korolev Bureau to develop a booster for launching planetary probes. A larger third stage was added along with a fourth stage (Blok L) that was designed to fire in-orbit to send the payload out of LEO. The basic R-7 core was also structurally strengthened and given more powerful engines. A rushed development produced multiple malfunctions of the upper stages, which led to its being replaced by the improved Molniya-M in 1964, but there were enough 8K78s left to continue flying them into 1967. 
Molniya (E6) was a minor revision adapted for launch of some Luna series space probes.
"Molniya-M Carrier Rocket". РКЦ Прогресс. Retrieved 7 October 2014.
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