Vernor Engine

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Vernor Engine
Part image
Reaction Control System by
Reaction Systems Ltd
Radial size Radial mounted
Cost (total) 150.00 Funds
Mass (total) 0.08 t [N 1]
Drag 0.01 [N 1]
Max. Temp. 2000 K
Impact Tolerance 15 m/s
Research Tech tree large control.png Specialized Control
Unlock cost 1 800 Funds
Since version 0.24
Part configuration vernorEngine
Maximum thrust (1 atm) 6.46 kN
(vacuum) 12.00 kN
Isp (1 atm) 140 s
(vacuum) 260 s
Fuel consumption 0.94 Units of fuel/s

Thrust vectoring × No
Thrust vectors 1 (zenith)

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

The Vernor Engine is the first stock RCS thruster fueled by liquid fuel and oxidizer like rocket engines. Instead of being throttleable like other stock reaction engines, the Vernor Engine reacts to movement commands for Reaction Control System. In the product description, the official name is VR-N1ER Veer-Governor.


This engine is not throttleable because the SAS uses the RCS if activated, and thus this engine has variable thrust when compensating rotation.

Compared to the other two RCS engines previously available, this new engine has a higher specific impulse in atmosphere which makes them suitable to steer heavy craft while ascending. The thrust is also 12 times higher than one RCS port which allows only a few thrusters to stabilize the craft. Because it uses liquid fuel and oxidizer the same fuel flow logic applies. Thus the part needs to be connected to a tank either directly or by a fuel transferring part.

The name seems to be a play on Vernier thruster which are used in real life like this part to control the craft.

Despite the listed mass, the part has the "PhysicsSignificance = 1" flag, and is therefore massless and dragless.

Product description

The VR-N1ER Veer-Governor, or "Vernor" Engine is an attitude control thruster. These motors are linked to RCS controls, but are powered by a Fuel+Oxidizer mix, making them significantly more powerful than MonoPropellant-powered RCS thrusters. They are fairly more bulky in comparison though, and feature only one nozzle facing outwards, although most agree that is an acceptable trade-off for the additional punch they pack.


  • New model and texture
  • entryCost decreased from 4200 to 1800
  • Cost decreased cost from 1400 to 150
  • Tolerance decreased cost from 50 to 15
  • Initial release