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Kit (Pressure Fed Gas Engine)

Fabrication
Created with	Rocket Manufactory (Tier One)
Cost	60000 Energy, 20g Steel, 5g Electrum, 20g Invar, 10g Constantan
Temperature
Flashpoint	373K (100°C)
Autoignition	573K (300°C)
Other properties
Paintable	Yes
Stack Size	1
Prefabs
Prefab Hash	-121514007
Prefab Name	ItemKitPressureFedGasEngine

Pumped Liquid Engine

Operation
Base Power Usage	10W
Rocket Mass Contribution	500kg
Max Thrust	40.3kN
Efficiency	96%
Exhaust Velocity	3.86km/s (Isp: 394s)
Contruction
Total cost	5x Insulated Pipe, 4x Steel Sheets
Constructed from	Kit (Pressure Fed Gas Engine)
Other properties
Paintable	Yes
Prefabs
Prefab Hash	-624011170
Prefab Name	StructurePressureFedGasEngine

Description

"Inefficient but very powerful, the Pressure Fed Gas Engine moves gas from each of its two inputs based on the pressure of the input pipes. Control the mixing ratio of fuel by tweaking the input pressures to a target 2:1 mix of Liquid Volatiles to Liquid Oxygen gas. Chilling propellant gasses or using Liquid Nitrous Oxide as an oxydizer will result in even higher trhust outputs."
- Stationpedia

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 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	Base Power Usage	Rocket Mass Contribution	Max Thrust	Real Max Thrust		Efficiency	Exhaust Velocity
				Using O2	Using N2O
Pressure Fed Gas Engine	10W	500kg	40,3kN	61,0kN	41,9kN	96%	3,86km/s (Isp: 394s)
Pumped Gas Engine	200W	500kg	16,2kN	16,5kN	24,5kN	100%	4,02km/s (Isp: 411s)
Pumped Liquid Engine	200W	500kg	17,6kN	18,7kN	31,3kN	140%	5,47km/s (Isp: 559s)
Pressure Fed Liquid Engine	20W	500kg	29,2kN	43,4kN - 38,1kN	74,5kN - 61,3kN	160%	6,18km/s (Isp: 631s)
Update 0.2.4726.21691 - 18/01/2024 Rocket_Engines

Controversy

This engine is controversially discussed among stationeers as possibly beeing the best choise of engine, but it depends on the use case. If using Liquid Nitrous Oxide as an oxydizer, it will most likely liquify in the tanks andor pipes and make your rocket go boom.

Usage

To make the rocket work, use 2 Volume Pumps, 2 Pipe Analyzers and a IC10 Script to keep the Pressure up. Maybe don't build this rocket if it's your first one. The ideal pressure of the intake pipes is not a fixed number; it depends on the size and weight of your rocket and needs to be determined either mathematically or by trial and error.

Control

Setup that proves to work nicely:
define ATMOSMODEVOLPRESSURE 10000

define ATMOSMODEOXYPRESSURE 5000

define FULLMODEVOLPRESSURE 54000

define FULLMODEOXYPRESSURE 27000

define LOWTHROTTLETHRESHOLD 60 # the rocket is possibly landing when Throttle is lower that

Define Constants and Variables:

Pressure Settings: Determine and define the pressure values for both atmosphere and full mode. These will be used to control the pressure of the gases in the system.
Engine Parameters: Identify key parameters such as throttle thresholds and engine hash identifiers.

Initialize Components:
Enable Components: Turn on the necessary components like Volume Pumps and Pipe Analyzers to ensure they are functioning correctly.
Set Up Variables: Initialize variables for tracking current values like thrust-to-weight ratio and throttle.

Monitor Engine State

Measure Thrust-to-Weight Ratio: Continuously check the current thrust-to-weight ratio to determine the operating state of the rocket.
Throttle Levels Monitor the current throttle level to determine if the rocket is under high or low throttle conditions.

Throttle

Low Throttle Condition If the throttle is below a certain threshold, this usually indicates the rocket might be landing or in a low-power state. Adjust the pressure settings accordingly.

High Throttle Condition For high throttle, maintain or adjust the pressure settings to ensure optimal performance and efficiency.

Pressure Adjustment Logic

Atmosphere Mode Set the pressure values for gas inputs to match the atmospheric conditions. This involves checking if the pressure is too high or too low and adjusting the volume pumps accordingly.
Full Mode When the rocket is in full power mode (e.g., during Takeoff or possibly landing), adjust the pressures to higher values to optimize thrust.

Control Loop

Continuous Monitoring The script should continuously loop, checking and adjusting the pressure settings based on the current state of the rocket. This ensures the rocket operates efficiently throughout its journey.

Handling Pressure Adjustments

Adjust Pumps: Depending on the current pressure readings, activate or deactivate pumps and set their volumes to reach the desired pressure levels.

Update Settings: Make real-time adjustments to the pump settings to maintain the appropriate pressure levels for both atmosphere and space conditions.

Data Network Properties

Click here to see/hide all the data network properties

Input Data (Write)

Parameter Name	Data Type	Value	Description
On	Boolean	0	Turns the device off.
		1	Turns the device on.
Setting	int		A variable setting that can be read or written, depending on the device.
Throttle	int		Increases the rate at which the machine workes (range: 0-100)
Update 0.2.4726.21691 - 19/01/2024 /Data_Network

Output Data (Read)

Parameter Name	Data Type	Value	Description
Power	Boolean		Can be read to return if the device is correctly powered or not, set cia the power system, return 1 if powered and 0 if not.
Error	Boolean		1 if device is in error state, otherwise 0.
Pressure	int		The current pressure reading of the device.
Temperature	int		The current temperature reading of the device.
Setting	int		A variable setting that can be read or written, depending on the device.
RatioOxygen	int		The ratio of Oxygen in device atmosphere.
RatioCarbonDioxide	int		The ratio of Carbon Dioxide in device atmosphere.
RatioNitrogen	int		The ratio of Nitrogen in device atmosphere.
RatioPollutant	int		The ratio of Pollutant in device atmosphere.
RatioVolatiles	int		The ratio of Volatiles in device atmosphere.
RatioVolatiles	int		The ratio of water in device atmosphere.
Maximum	int		Maximum setting of the device.
Ratio	int		Context specific value depending on device, 0 to 1 based ratio.
Ratio	Boolean		The current state of the device, 0 for off, 1 for on.
RequiredPower	int		Idle operating power quantity, does not nevessarily include extra demand power.
TotalMoles	int		Returns the total moles of the device.
RatioNitrousOxide	int		The ratio of Nitrous Oxide in device atmosphere.
PrefabHash	int		The hash of the structure.
Combustion	Boolean		The assess atmosphere is on fire. Returns 1 if atmosphere is on fire, 0 if not.
Throttle	int		Increases the rate at which the machie works (range: 0-100)
ReferenceId		Unique Reference Identifier for this object.
PassedMoles	int		The number of moles that passed through this device on the previous simulation tick.
Update 0.2.4726.21691 - 19/01/2024 /Data_Network

Build States

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Pressure Fed Gas Engine/Build States