RV-105 RCS Thruster Block

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RV-105 RCS Thruster Block
Part image
Reaction Control System by
STEADLER Engineering Corps
Cost (total) 620.00 Fund
Mass (total) 0.05 t [N 1]
Drag 0.001 [N 1]
Max. Temp. 1500 K
Impact Tolerance 15 m/s
Research Tech tree advanced flight control.png Advanced Flight Control
Unlock cost 3400 Fund
Since version 0.11.0
Part configuration rcsBlockRV-105
Maximum thrust (1 atm) 0.42 kN
(vacuum) 1.00 kN
Isp (1 atm) 100 s
(vacuum) 240 s
Fuel con­sumption 0.11 units of fuel/s

Thrust vectoring × No
Thrust vectors 4 (sideways)

  1. 1.0 1.1 The mass and drag are from the part config, but the game handles it massless/dragless.

The RV-105 RCS Thruster Block is a part with four RCS thrusters used for spaceship rotation and translation movement and is fuelled by monopropellant.


This RCS thruster can produce a force in any of the directions its nozzles are pointing. Four of these blocks equally spaced around the center of mass of a vessel is typically enough to allow a small craft to rotate and translate in any direction, but larger ships often require more. In the current paid version (but not the 0.18.3 demo), it has "PhysicsSignificance = 1", making it a zero drag and massless part.

Product description

The recent discovery of a third law of physics made it possible for STEADLER Corps engineers to produce these small monopropellant thrusters, to help with attitude control and linear motion. Even though many Kerbal physicists still dispute the validity of this new law, studies show that the thrusters seem to work as advertised.

The third law of physics referenced in the quote is likely a reference to third law of motion, which says that every force generates an equal counter-force. That's exactly how monopropellant thrusters or rather any kind of reaction engines work: When expelling propellant with a specific force, an equal force pushes the spacecraft in the opposite direction.


  • "PhysicsSignificance = 1" added. The part now has 0 mass and drag, despite the listed values.
  • Nominal performance increased, bug providing vastly superior linear performance removed.
  • Retextured, given Isp values and actual mass.
  • Initial Release