S3 KS-25x4 "Mammoth" Liquid Fuel Engine

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S3 KS-25x4 "Mammoth" Liquid Fuel Engine
Part image
Liquid fuel engine by
Radial size Extra large
Cost (total) 39 000.00 Funds
Mass (total) 15.00 t
Drag 0.2
Max. Temp. 2000 K
Impact Tolerance 20 m/s
Research Tech tree very heavy rocketry.png Very Heavy Rocketry
Unlock cost 115 000 Funds
Since version 0.23.5
Part configuration Size3EngineCluster
Liquid fuel engine
Maximum thrust (1 atm) 3 746.03 kN
(vacuum) 4 000.00 kN
Isp (1 atm) 295 s
(vacuum) 315 s
Fuel consumption 258.98 Units of fuel/s

Thrust vectoring 2 °
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 S3 KS-25x4 Engine Cluster is a liquid fuel engine with four nozzles. This is the engine with the highest thrust and, compared to the thrust, high specific impulse. It doesn't allow placing additional stages beneath the engine cluster. This is the second liquid fuelled engine after the R.A.P.I.E.R. Engine which uses multiple nozzles.

The KS-25 might be a reference to the Space Shuttle Main Engines which are also named RS-25, especially as it was introduced as a Space Launch System component which uses four RS-25 engines.

Manufacturer's description

Designed for usage as a first stage, this engine uses four of Kerbodyne's KS-25 rocket motors. This is the first in a series of designs that move away from the pattern of simply increasing the engine and nozzle size on a rocket.



  • Initial release