RK-7 "Kodiak" Liquid Fueled Engine

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RK-7 "Kodiak" Liquid Fueled Engine
Part image
Liquid fuel engine by
Reaction Systems Ltd

Radial size Medium
Cost (total) 1 100.00 Funds
Mass (total) 1.25 t
Drag 0.2-0.3
Max. Temp. 2000 K
Volume  ?
Impact Tolerance 9 m/s
Research Heavier rocketry.png Heavier Rocketry
Unlock cost 4 400 Funds
Since version 1.4.1
Part configuration LiquidEngineRK-7.cfg
Maximum thrust (1 atm) 247.00 kN
(vacuum) 260.00 kN
Isp (1 atm) 285 s
(vacuum) 300 s
Fuel consumption 17.68 Units of fuel/s

Thrust vectoring No

The RK-7 "Kodiak" is a liquid fueled engine similar in performance to the LV-T30 "Reliant" Liquid Fuel Engine, but with a "Russian" theme. It allows for greater visual and thematic variety in Making History scenarios, and usually is used in conjunction with the RV-1 vernier.


Prior to 1.6, the RK-7's thrust, mass, Isp, and lack of vectoring make it almost identical (if more expensive) than the LV-T30, meaning it can in principle be used in the same situations. The high cost and position on the tech tree, however, make it an inferior choice in most situations.

After changes in 1.6, RK-7 have an increase in thrust, giving it a better ASL TWR and ISP, while the cost is lowered to make it identical to LV-T30. While it still high on the tech tree, due to its lower cost compare to vector and possibly better TWR than Skiff (craft dependent), once aesthetic is ignored it becomes a good engine for use in career mode.

Product description

A bear of an engine. This quad-nozzled beast comes with multiple cowling options, and no gimbal. Don’t forget those verniers.

Reaction Systems Ltd


As of version 1.4.1 this engine has three models that can be switched in the editor.

Bare variant
ShroudBig variant
ShroudSmall variant
The different variants of the engine


While bears are often used as a symbol of Russia, [kodiaks] live exclusively in the United States.

Real-world comparison

The RK-7 was inspired by the Russian RD-107 engine.


  • Increased unlock cost from 4200 to 4400
  • Decreased cost from 1300 to 1100
  • Increased crash tolerance from 6 to 9
  • Increased EC generation from 3 to 5
  • Increased ASL thrust to 247
  • Increased vacuum thrust from 240 to 260
  • Improved Isp
  • Added ModuleTestSubject
  • Initial Release