LV-T30 "Reliant" Liquid Fuel Engine

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LV-T30 "Reliant" Liquid Fuel Engine
Part image
Liquid fuel engine by
Jebediah Kerman's Junkyard and Spacecraft Parts Co

Radial size Small
Cost (total) 1 100.00 Funds
Mass (total) 1.25 t
Drag 0.2
Max. Temp. 2000 K
Volume  ?
Impact Tolerance 7 m/s
Research General rocketry.png General Rocketry
Unlock cost 3 200 Funds
Since version 0.7.3
Part configuration liquidEngineLV-T30.cfg
Liquid fuel engine
Maximum thrust (1 atm) 205.16 kN
(vacuum) 240.00 kN
Isp (1 atm) 265 s
(vacuum) 310 s
Fuel consumption 15.79 Units of fuel/s

Thrust vectoring No

The LV-T30 Liquid Fuel Engine is a basic liquid fuel engine.

Product description

Although criticized by some due to their not insignificant use of so-called "pieces found lying about", the LV-T series engines have proven themselves as comparatively reliable. The T30 model boasts a failure and rattly bits ratio below the 50% mark, this has been considered a major improvement over previous models by engineers and LV-T enthusiasts.

Jebediah Kerman's Junkyard and Spacecraft Parts Co


As a liquid fuel engine, the Reliant has throttle control, shutdown and restart capabilities, making it easier to control vehicles safely and accurately. It also has nearly twice the specific impulse of the solid motors that went before it. It cannot be placed radially; however, since rocket fuel tanks can be placed radially, the Reliant can be the basis of liquid-fueled strap-on boosters in parallel configurations. Since the engine lacks thrust vector control, other means must be incorporated to make sure the vehicle remains pointed in the right direction, such as parts with reaction wheels, aerodynamic fins and control surfaces, and parallel operating gimbaled engines such as the LV-T45 "Swivel" Liquid Fuel Engine.

The Reliant has the highest Thrust to Cost ratio of any liquid fueled engine in the game, meaning it produces a kN of thrust most cheaply. This makes it one of the most cost-effective engines in career, although compensating for the lack of gimballing may cause the final rocket to be more expensive.


  • Previously, this engine was unlocked first in the tech tree, before the LV-T45 "Swivel" Liquid Fuel Engine. Its product number and description support the idea of the Swivel being a more advanced version of the Reliant.
  • It is similar in appearance to the RS-56-OBA booster engine used by the late Atlas II rocket.


  • New model
Pre-0.18 appearance.
  • Thrust increased from 215 to 240.
  • Isp changed from 300 s vacuum/280 s at 1 atm to 310 s vacuum/265 s at 1 atm.
  • Isp decreased from 370 s vacuum/320 s at 1 atm to 300 s vacuum/280 s at 1 atm.
  • Cost increased from 850 to 1100 funds.
  • Electricity production increased to 7.0
  • Retextured and remeshed
  • Alternator added, engine now gains 1.0 electricity
  • Major CFG revision (most notably Isp added)
  • (Bug fix) Liquid Engine particle effects responding to engine cutoff
  • Initial release