Kerbodyne KR-2L+ "Rhino" Liquid Fuel Engine

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Kerbodyne KR-2L+ "Rhino" Liquid Fuel Engine
Part image
Liquid fuel engine by
Radial size Extra large
Cost (total) 25 000.00 Funds
Mass (total) 9.00 t
Drag 0.2
Max. Temp. 2000 K
Impact Tolerance 7 m/s
Research Tech tree very heavy rocketry.png Very Heavy Rocketry
Unlock cost 68 000 Funds
Since version 0.23.5
Part configuration Size3AdvancedEngine
Liquid fuel engine
Maximum thrust (1 atm) 1 205.88 kN
(vacuum) 2 000.00 kN
Isp (1 atm) 205 s
(vacuum) 340 s
Fuel consumption 119.97 Units of fuel/s

Thrust vectoring 4 °
Testing Environments
On the surface ✓ Yes
In the ocean ✓ Yes
On the launchpad ✓ Yes
In the atmosphere ✓ Yes
Sub orbital ✓ Yes
In an orbit ✓ Yes
On an escape ✓ Yes
Docked × No
Test by staging ✓ Yes
Manually testable ✓ Yes

The Kerbodyne KR-2L Advanced Engine is an extra large liquid fuel engine which has a high specific impulse compared to the thrust. While the specific impulse is lower than the Rockomax "Mainsail" Liquid Engine in atmosphere, the Isp in vacuum is higher than most of the engines, including the Mainsail and Rockomax "Skipper" Liquid Engine. Only the LV-N Atomic Rocket Motor, Toroidal Aerospike Rocket, LV-909 Liquid Fuel Engine and Rockomax "Poodle" Liquid Engine are more efficient, but only have 10% (at most) of this engine's thrust.

The KR-2L might be a reference to the J-2X, a planned upper stage engine for Space Launch System.

This, and the fact that it allows attaching parts on both sides of the engine, make it a very useful engine for upper stages. Especially because the S3 KS-25x4 Engine Cluster is the only other extra large engine in 0.25 but doesn't allow attaching parts below the engine. It has the second highest thrust of all engines available.[outdated]

Product description

This engine is Kerbodyne's first attempt at a super heavy lifting engine. Later models have been designed with multiple nozzles to prevent a single point of failure, and reduce manufacturing costs.


  • Cost increased from 21000 to 25000, mass increased from 8.5 to 9, specific impulse at sea level increased from 170 to 255.
  • Cost increased from 2850 to 20850 (and made meaningful)
  • Initial release