LK-1 was a projectedSoviet crewed lunar flyby spacecraft. It would be launched on a three-stageProton launch vehicle. The project started in 1962 under the lead engineerVladimir Chelomey,^[1] with the first flight planned for 1967.

The LK-1 had its origin in several early 1960s spacecraft projects under the generic names ofkosmoplans andraketoplans.^[2]

In 1965 the project was cancelled in favour of theSoyuz 7K-L1 spacecraft.^[2]

Further developments came as theLK-700 direct-descent lunar lander program.

The spacecraft consisted of the following modules:

• ADU Emergency Engine Unit
• VA Capsule (crew module)
• PAB Equipment-Rocket System Block (service module)
• RB Translunar Injection Stage

• Crew Size: 2
• Spacecraft delta v: 3,300 m/s
• Electric System: 2.00 average kW.
• Gross mass: 17,000 kg
• Un-fuelled mass: 4,000 kg
• Height: 5.20 m
• Span: 7.27 m

• Encyclopedia Astronautica:
  • LK-1, with an image of an assembled translunar spacecraft

• Crewed spacecraft
• Cancelled Soviet spacecraft
• Soviet lunar program
• Crewed space program of the Soviet Union
• NPO Mashinostroyeniya products