Kerbodyne KE-1 "Mastodon" Liquid Fuel Engine

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Kerbodyne KE-1 "Mastodon" Liquid Fuel Engine
Part image
Liquid fuel engine by

Radial size Small, Medium, Large
Cost (total) 8 000.00 Funds
Mass (total) 5.00 t
Drag 0.2-0.3
Max. Temp. 2000 K
Volume  ?
Impact Tolerance 15 m/s
Research Tech tree very heavy rocketry.png Very Heavy Rocketry
Unlock cost 32 000 Funds
Since version 1.4.1
Part configuration LiquidEngineKE-1.cfg
Maximum thrust (1 atm) 1 283.61 kN
(vacuum) 1 350.00 kN
Isp (1 atm) 290 s
(vacuum) 305 s
Fuel consumption 90.27 Units of fuel/s

Thrust vectoring 5 °

The Kerbodyne KE-1 "Mastodon" Liquid Fuel Engine is a powerful size large engine appropriate for first stages.


The Mastodon has the second-highest thrust-to-weight ratio of any liquid fuel engine in the game, trailing only the "Twin-Boar", which has the highest after subtracting away the integrated fuel tank.

The Mastodon has 90%-93% of the thrust of the Mainsail, but only 83% of the Mainsail's weight and 62% of its cost. So it is often an effective replacement for the Mainsail.

Because the Mastodon can be independently mounted, clusters of this engine are an ideal way to lift extremely heavy payloads, such as 5-9 mounted on the Kerbodyne Engine Cluster Adapter Tank.

Product description

Considered to be the behemoth of rocket technology, this propulsion system is the pinnacle of power.



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

Full variant
Mid variant
Bare variant
The different variants of the engine


Real-world comparison

The engine was inspired by the American Rocketdyne F-1 engine used on the Saturn V. The engine is also featured in the stock Acapello vessel.


  • Decreased unlock cost from 135000 to 32000
  • Decreased cost from 22000 to 8000
  • Increased crash tolerance from 6 to 15
  • Increased EC generation from 3 to 8
  • Improved Isp
  • Added ModuleTestSubject
  • Initial Release