Unofficial Stationeers Wiki Unofficial Stationeers Wiki

Kit (Pumped Gas Rocket Engine)

Recipe
Created With	Rocket Manufactory
Cost	15g Iron, 10g Copper, 5g Gold

Pumped Gas Engine

Operation
Construction
Placed with	Kit (Pumped Gas Rocket Engine)
Placed on	Engine Mount
Stage 1
Deconstruction
Item received	Kit (Pumped Gas Rocket Engine)
Stage 2
Next Stage Construction
Constructed with item	5 x Kit (Pipe)
Deconstruction
Item received	5 x Kit (Pipe)
Stage 3
Next Stage Construction
Constructed with tool	Welding Torch
Constructed with item	4 x Steel Sheets
Deconstruction
Item received	4 x Steel Sheets

Description

The pumped gas rocket engine uses a 2:1 mix of Volatiles to Oxygen. It has a maximum thrust of 16.2kN and contributes 500kg to the overall weight of the rocket. Despite its Stationpedia entry, this engine has a measured specific impulse of 2,860s with a perfect volatiles and oxygen fuel mix and 2,080s with a 1:1 volatiles and N₂O mix. To travel to mars orbit it is recommended the rocket weigh less than 8000kg.

Comparison

Rocket Engines give you their max output in kN with this you can calculate what they can reasonably carry into orbit depending on the planet or moon you are on. Force = Mass * Acceleration. Acceleration is equal to the planet's gravity, Mass is given in kg per part of the rocket, and Force is kN. If your thrust force listed below is less than the weight of the rocket in kN then you will not even take off. It is better to have a thrust much higher than the weight of the rocket or else you risk running out of fuel on launch and on landing.

Liquid propellants bring greater efficiencies. Using Nitrous Oxide as oxidizer provides excessive thrust values. Keep in mind that N2O fuel mix is 1.9375 times heavier at same moles, or 2.15 times heavier at same volume, while thrust boost is around 1.5-1.7. Engine efficiency determines "bonus" thrust multiplier, meaning engine with higher efficiency will give more thrust consuming same amount of fuel. Thus using liquid engines is more favorable if one can cool fuel down, moreover Pressure Fed Engines consume fuel inversely proportional to its temperature. On the other hand if Volatiles and Oxygen are in excess (e.g. farm on Vulcan) is may be much easier to opt for Pressure Fed Gas Engine. It will provide ~40kN at 20°C.

Name	Power Usage, W	Rocket Mass Contribution, kg	Formal Max Thrust, kN	Tested Max Thrust, kN		Propellant consumption, mol/tick		Efficiency, %	Exhaust Velocity, km/s	Specifc Index Isp, s
				Using O2	Using N2O	Using O2	Using N2O
Pumped Gas Engine	200	500	16.20	16.54	24.47	18.00	18.00	100	4.02	411
Pumped Liquid Engine	200	500	17.90	18.74	31.25	15.00	16.66	140	5.56	568
Pressure Fed Gas Engine	10	500	40.30	60.32	41.57	69.77	31.68	96	3.86	394
Pressure Fed Liquid Engine	20	500	29.30	38.84	59.70	27.23	28.16	160	6.31	644
Heavy Pressure Fed Gas Engine	10	750	62.60	93.87	64.75	118.45	53.83	88	3.54	361
Heavy Pressure Fed Liquid Engine	20	750	44.30	60.39	95.52	47.03	49.86	144	5.68	579
Update 0.2.6136.26812 - 01/28/2026 Rocket_Engines