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LFB KR-1x2 "Twin-Boar" Liquid Fuel Engine

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LFB KR-1x2 "Twin-Boar" Liquid Fuel Engine
Part image
Liquid fuel engine by
Radial size Large
Cost (total) 17 000.00 Fund
(dry) 14 062.40 Fund
Mass (total) 42.00 t
(dry) 10.00 t
Drag 0.2
Max. Temp. 2000 K
Impact Tolerance 20 m/s
Research Heavier rocketry.png Heavier Rocketry
Unlock cost 65000 Fund
Since version 0.23.5
Part configuration Size2LFB
On the surface ✓ Yes
On the ocean ✓ Yes
In atmosphere ✓ Yes
In space ✓ Yes
Test by staging ✓ Yes
Manually testable ✓ Yes
Liquid fuel engine
Maximum thrust (1 atm) 280.00 kN
(vacuum) 2 142.86 kN
Isp (1 atm) 280 s
(vacuum) 300 s
Fuel con­sumption 145.48 Jerry-can char.svg/s
Thrust vectoring 1.5 °
Liquid fuel tank
Liquid fuel 2 880.000 Jerry-can char.svg
Oxidizer 3 520.000 Jerry-can char.svg

The LFB KR-1x2 is the first part that contains both: a liquid fuel tank and a liquid fuel engine. Usually only solid rocket boosters using solid fuel contain both, because solid fuel can't be transferred. Unlike solid rocket boosters this liquid fuel booster can run longer by pumping additional liquid fuel and oxidizer to the part. It is also throttleable, both by the main throttle and a thrust limiter tweakable. Minimum thrust required for booster to lift its own weight is 17.5%.

The LFB KR-1x2 might be a reference to the Advanced Boosters, a future Space Launch System Block 2 component.

This booster contains two engines at the bottom which are added radially, so the base of the booster is wider than a usual large tank. It also does not allow any parts to be attached below it. It contains the same amount of fuel as the Rockomax Jumbo-64 Fuel Tank (2880). The thrust is higher than the Rockomax "Mainsail" Liquid Engine and is thus the most powerful large-sized engine. However, its Isp is significantly (30 s) lower than that of the Mainsail at all altitudes.

Product description

This liquid fuel booster system was designed to allow for finer control of launches instead of relying solely on single engine solid rocket boosters it employs two modified KR-1 engines as the source of its immense lifting power.
This liquid fuel booster system is a very purposeful piece of engineering. Instead of relying on single engines or solid rocket boosters, the KR-1x2 employs two modified KR-1 engine, fed by a built-in fuel system, as the source of its immense lifting power. All that self-contained goodness comes at the cost of not having a mounting point for its underside, and not being quite as efficient as dedicated engines. It also comes at quite a literal cost as well.

Kerbodyne 0.24


  • Changed cost (5900 -> 16400), reduced Isp from 320-360 s to 290-340 s, changed description.
  • Initial release
Default parts
Jet engines Basic Jet EngineTurboJet EngineR.A.P.I.E.R. Engine
Liquid fuel tanks Oscar-B Fuel TankROUND-8 Toroidal Fuel TankFL-T100 Fuel TankFL-T200 Fuel TankFL-T400 Fuel TankFL-T800 Fuel TankRockomax X200-8 Fuel TankRockomax X200-16 Fuel TankRockomax X200-32 Fuel TankRockomax Jumbo-64 Fuel TankKerbodyne S3-3600 TankKerbodyne S3-7200 TankKerbodyne S3-14400 Tank
Liquid fuel engines LV-1 Liquid Fuel EngineLV-1R Liquid Fuel EngineRockomax 24-77Rockomax 48-7SRockomax Mark 55 Radial Mount Liquid EngineToroidal Aerospike RocketLV-N Atomic Rocket MotorLV-909 Liquid Fuel EngineLV-T45 Liquid Fuel EngineLV-T30 Liquid Fuel EngineRockomax "Poodle" Liquid EngineRockomax "Skipper" Liquid EngineRockomax "Mainsail" Liquid EngineR.A.P.I.E.R. EngineKerbodyne KR-2L Advanced EngineLFB KR-1x2S3 KS-25x4 Engine Cluster
Solid fuel rockets Sepratron IRT-10 Solid Fuel BoosterRockomax BACC Solid Fuel BoosterS1 SRB-KD25k
Monopropellant fuel tanks Stratus-V Cylindrified Monopropellant TankStratus-V Roundified Monopropellant TankFL-R1 RCS Fuel TankFL-R10 RCS Fuel TankFL-R25 RCS Fuel TankMk2 Monopropellant TankMk3 Monopropellant Tank
Monopropellant engines O-10 MonoPropellant Engine
Jet fuselages Mk1 Fuselage - Jet FuelMk2 to size 1 AdapterMk2 FuselageMk3 to Mk2 AdapterMk3 Fuselage
Fuel transfer FTX-2 External Fuel Duct