LV-T91 "Cheetah" Liquid Fuel Engine

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LV-T91 "Cheetah" Liquid Fuel Engine
Part image
Liquid fuel engine by
Jebediah Kerman's Junkyard and Spacecraft Parts Co

Radial size Medium
Cost (total) 850.00 Funds
Mass (total) 1.00 t
Drag 0.2-0.3
Max. Temp. 2000 K
Volume  ?
Impact Tolerance 7 m/s
Research Heavier rocketry.png Heavier Rocketry
Unlock cost 3 400 Funds
Since version 1.4.1
Part configuration LiquidEngineLV-T91.cfg
Maximum thrust (1 atm) 52.82 kN
(vacuum) 125.00 kN
Isp (1 atm) 150 s
(vacuum) 355 s
Fuel consumption 7.18 Units of fuel/s

Thrust vectoring 4 °

Styled as an upper stage for carrier rockets based on the w: Titan II, the LV-T91 "Cheetah" Liquid Fuel Engine is nonetheless a general purpose upper/orbital transfer stage.


As a size 1.5 / 1.875 m diameter part, the LV-T91 fits neatly between the LV-909 and Poodle. It similarly fits between them in terms of mass, specific impulse, and thrust to weight. This gives a narrow optimal usage window, although it remains a decent engine outside of it.

Product description

This engine will get you moving fast. Eventually.… Great for those long distance trips in space despite its namesake. Marketing, you know?

Jebediah Kerman's Junkyard and Spacecraft Parts Co


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

Cap1875 variant
Bare variant
The different variants of the engine


Real-world comparison

The LV-T91 was inspired by the American LR91 engine.


  • Increased unlock cost from 3000 to 3400
  • Decreased cost from 1000 to 850
  • Increased crash tolerance from 6 to 7
  • Increased EC generation from 3 to 5
  • Increased vectoring from 3 to 4
  • Improved Isp
  • Added ModuleTestSubject
  • Initial Release