Mk-55 "Thud" Liquid Fuel Engine

From Kerbal Space Program Wiki
Revision as of 00:36, 3 March 2015 by Brendan (talk | contribs) (+Link. ¡¡QUEST!!: Verifiy change to "Eugene Kerman" in new description)
Jump to: navigation, search
Mk-55 "Thud" Liquid Fuel Engine
Part image
Liquid fuel engine by
Rockomax Conglomerate
Radial size Radial mounted
Cost (total) 820.00 Funds
Mass (total) 0.90 t
Drag 0.2
Max. Temp. 2000 K
Impact Tolerance 7 m/s
Research Advanced rocketry.png Advanced Rocketry
Unlock cost 3 500 Funds
Since version 0.16
Part configuration liquidEngineMk55
Liquid fuel engine
Maximum thrust (1 atm) 108.20 kN
(vacuum) 120.00 kN
Isp (1 atm) 275 s
(vacuum) 305 s
Fuel consumption 8.02 Units of fuel/s

Thrust vectoring 8 °
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 Rockomax Mark 55 Radial mount engine requires fuel from external liquid fuel tanks, and must be either connected beneath them or be on the receiving end of a fuel line.


The Mark 55 is the third liquid fuel engine with thrust vector control that allows efficient control of the rocket during descent and landing. The Mk 55 is fairly low-thrust. This is offset by its comparatively low weight, however. The engine has a TWR comparable to the LV-T45.

The low thrust and radial mounting makes a single Mk 55 unsuitable as a main engine on most lower stages, but it can be used to augment other engines. A common use of this engine is in lander designs, as it eliminates the need to have a vulnerable engine in an easily-damaged position. The Isp of this engine is adequate, being 320 s at 1 atm and 360 s in vacuum, not far behind the LV-T30 and LV-T45.

Additionally, landing legs can be added to these engines. This is an advantage shared between radial engines, such as the LV-1R, Rockomax 24-77 and Mark 55.

As of 0.90.0[outdated], this engine has for the highest range of gimbal at 5 degrees.

Product description

After an intensive search for an engineer crazy enough to plan and build a revolutionary new engine type, researchers stumbled across Eugene Kerman - or, as he's known by night... THE CONSTRUCTOR! He failed miserably, and this is what we got instead.
After an intensive search for an engineer crazy enough to plan and build a revolutionary new engine type, researchers turned to renowned engineer Eumon Kerman, one of the top minds in the industry. He failed miserably at the job, and this is what we ended up with.

Rockomax Conglomerate, 0.24


  • Cost reduced from 850 to 800, Isp increased from 290 vacuum / 320 atmosphere to 360 vacuum / 320 atmosphere, gimbal range increased from 3° to 5°.
  • Description changed
  • Mass reduced from from 1.5 to 0.9, gimbal range increased to 3°, Isp curve changed from 330 vacuum/280 atmosphere to 320 vacuum/290 atmosphere, heat production increased from 300 to 350.
  • Renamed 'Mark 55 Radial mount engine' to 'Rockomax Mark 55 Radial Mount Liquid Engine'
  • Thrust increased from 80 kN to 120 kN.
  • Manufacturer changed from Jebediah Kerman's Junkyard and Spaceship Parts Co. to Rockomax Conglomerate.
  • Initial Release