Kosmos 1686 (Russian: Kocmoc 1686 meaning Cosmos 1686), also known as TKS-4 or TKS-M, was a heavily modified TKS spacecraft which docked unmanned to the Soviet space station Salyut 7 as part of tests to attach scientific expansion modules to stations in Earth orbit. The module which docked to the station was the FGB component of a TKS vehicle launched on September 27, 1985, and was designed to test systems planned for use on the Mir Core Module. The spacecraft docked with Salyut 7 on October 2, 1985, during the long-duration stay of the cosmonauts of its fifth principal expedition, which arrived on Soyuz T-14.[2] It was the last flown TKS spacecraft.


  • Created On: Android
  • Game Version: 0.9.924.0
  • Price: $346,974k
  • Number of Parts: 1140
  • Dimensions: 56 m x 20 m x 20 m


  • Total Delta V: 1.6km/s
  • Total Thrust: 16.8MN
  • Engines: 49
  • Wet Mass: 2.49E+6kg
  • Dry Mass: 2.21E+5kg


Stage Engines Delta V Thrust Burn Mass
1 12 353m/s 9.8MN 85s 2.49E+6kg
3 4 584m/s 2.4MN 2.1m 5.68E+5kg
5 0 0m/s 0N 0s 2.31E+5kg
6 5 666m/s 732kN 1.5m 1.13E+5kg
7 0 0m/s 0N 0s 0kg
8 0 0m/s 0N 0s 0kg
10 0 0m/s 0N 0s 0kg

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