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Fix and greatly expand resistojet RCS configs #2985

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Aug 11, 2024
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Fix and greatly expand resistojet RCS configs #2985

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328 changes: 310 additions & 18 deletions GameData/RealismOverhaul/Engine_Configs/Electric_Engine_Configs/Electric_RCS_Config.cfg
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Original file line number Diff line number Diff line change
@@ -1,4 +1,21 @@
// RCS generic config
// sources:
// http://www.astronautix.com/graphics/m/mr501b.jpg
// https://arc.aiaa.org/doi/abs/10.2514/6.1985-1159
// http://electricrocket.org/IEPC/7vc5f5xg.pdf
// https://seitzman.gatech.edu/classes/ae6450/electrothermal_thrusters.pdf
// https://ntrs.nasa.gov/api/citations/19920022098/downloads/19920022098.pdf

// Hard data a little hard to find. Anything other than MR-501/502 seems to be one-off systems or cubesat
// stuff designed for pulsed operation.
// Mostly from RPA.
// For basic cold gas propellants, heat is applied until the chamber temp reaches the target temp
// (decomposing propellants until they reach equilibrium if necessary). RPA enthalpy change used to
// determine power draw.
// For hydrazine, hydrazine is decomposed, and then heated further. Using real performance data because
// this is thermodynamically complex and the MR-501 is well-documented.
// Chamber pressure 0.75 MPA, expansion ratio 200, mass basis set based on MR-501B
// Config sizing set to ~1450 Watts at 1.0 scale (heating element is largest part)
@PART[*]:HAS[#engineType[ElectricRCSGeneric]]:FOR[RealismOverhaulEngines]
{
MODULE
Expand All @@ -10,47 +27,322 @@
minTechLevel = 2
origTechLevel = 2
engineType = L
configuration = Hydrazine-Electrothermal
configuration = Nitrogen-1000K
modded = false

origMass = 0.137
origMass = 0.00511 //based on MR-501B

//nitrogen resistojet: Vela-III, 1965 lvl2
//Ammonia resistojet: ATS-4, 1968 lvl3
//Hydrazine resistojet: Intelsat-V, 1980? GE Comsats 1980 lvl4
//MR-501: first mass-produced resistojet, Satcom 1R, 1983
//Wastejet: MOL, Freedom
//SERT II/SEPS (Solar Electric Propulsion System) mercury ion: 1970s
//Hydrazine Arcjet: Telstar 4, 1993
//N2O resistojet: UoSAT-12, 1999
//Butane resistojet: UK-DMC, 2003
//Water resistojet: UK-DMC, 2003
CONFIG
{
name = Hydrazine-Electrothermal
name = Nitrogen-1000K
specLevel = operational
thrusterPower = 0.045
thrusterPower = 0.0017
PROPELLANT
{
ratio = 1.0
name = Hydrazine
name = Nitrogen
DrawGauge = True
}

PROPELLANT
{
name = ElectricCharge
ratio = 1.2207 //Heating nitrogen from 273 to 1073K at 90% eff. RPA enthalpy calcs
DrawGauge = True
minResToLeave = 10.0
}

IspSL = 0.0
IspV = 0.4065
}
CONFIG
{
name = Nitrogen-2000K
specLevel = operational
thrusterPower = 0.0011
PROPELLANT
{
ratio = 1.0
name = Nitrogen
DrawGauge = True
}

PROPELLANT
{
name = ElectricCharge
ratio = 2.8779 //Heating nitrogen from 273 to 2073K at 90% eff. RPA enthalpy calcs
DrawGauge = True
minResToLeave = 10.0
}

IspSL = 0.0
IspV = 0.6276
}
CONFIG
{
name = CarbonDioxide-1000K
specLevel = operational
thrusterPower = 0.0021
PROPELLANT
{
name = Helium
ratio = 15.0
ratio = 1.0
name = CarbonDioxide
DrawGauge = True
}

PROPELLANT
{
name = ElectricCharge
ratio = 1.6840 //Heating co2 from 273 to 1073K at 90% eff. RPA enthalpy calcs
DrawGauge = True
minResToLeave = 10.0
}

IspSL = 0.0
IspV = 0.4347
}
CONFIG
{
name = CarbonDioxide-2000K
specLevel = operational
thrusterPower = 0.0011
PROPELLANT
{
ratio = 1.0
name = CarbonDioxide
DrawGauge = True
}

PROPELLANT
{
name = ElectricCharge
ratio = 4.7006 //Heating co2 from 273 to 2073K at 90% eff. RPA enthalpy calcs
DrawGauge = True
minResToLeave = 10.0
}

IspSL = 0.0
IspV = 0.6067
}
CONFIG
{
name = Hydrogen-1000K
specLevel = operational
thrusterPower = 0.0005
PROPELLANT
{
ratio = 1.0
name = Hydrogen
DrawGauge = True
}

PROPELLANT
{
name = ElectricCharge
ratio = 1.1597 //Heating hydrogen from 273 to 1073K at 90% eff. RPA enthalpy calcs
DrawGauge = True
minResToLeave = 10.0
}

IspSL = 0.0
IspV = 1.6198
}
CONFIG
{
name = Hydrogen-2000K
specLevel = operational
thrusterPower = 0.0003
PROPELLANT
{
ratio = 1.0
name = Hydrogen
DrawGauge = True
}

PROPELLANT
{
name = ElectricCharge
ratio = 2.6771 //Heating hydrogen from 273 to 2073K at 90% eff. RPA enthalpy calcs
DrawGauge = True
minResToLeave = 10.0
}

IspSL = 0.0
IspV = 2.3391
}
CONFIG
{
name = Ammonia-1000K
specLevel = operational
thrusterPower = 0.0006
PROPELLANT
{
ratio = 1.0
name = LqdAmmonia //autogenous pressurization
DrawGauge = True
}

PROPELLANT
{
name = ElectricCharge
ratio = 4211 //Heating ammonia from 273 to 1073K at 90% eff. RPA enthalpy calcs
DrawGauge = True
minResToLeave = 10.0
}

IspSL = 0.0
IspV = 0.8568
}
CONFIG
{
name = Ammonia-2000K
specLevel = operational
thrusterPower = 0.0005
PROPELLANT
{
ratio = 1.0
name = LqdAmmonia //autogenous pressurization
DrawGauge = True
}

PROPELLANT
{
name = ElectricCharge
ratio = 7256 //Heating ammonia from 273 to 2073K at 90% eff. RPA enthalpy calcs
DrawGauge = True
minResToLeave = 10.0
}

IspSL = 0.0
IspV = 1.1508
}
CONFIG
{
name = Water-1000K
specLevel = operational
thrusterPower = 0.0018
PROPELLANT
{
ratio = 1.0
name = Water
DrawGauge = True
}
PROPELLANT
{
name = Nitrogen
ratio = 11.25
ignoreForIsp = True
}

PROPELLANT
{
name = ElectricCharge
ratio = 3257
ratio = 1354 //Heating water from 273 to 1073K at 90% eff. RPA enthalpy calcs
DrawGauge = True
minResToLeave = 10.0
}

IspSL = 0.0
IspV = 0.5785
}
CONFIG
{
name = Water-2000K
specLevel = operational
thrusterPower = 0.0009
PROPELLANT
{
ratio = 1.0
name = Water
DrawGauge = True
}
PROPELLANT
{
name = Nitrogen
ratio = 11.25
ignoreForIsp = True
}
PROPELLANT
{
name = ElectricCharge
ratio = 4354 //Heating water from 273 to 2073K at 90% eff. RPA enthalpy calcs
DrawGauge = True
minResToLeave = 10.0
}

IspSL = 0.30
IspV = 0.9006
IspSL = 0.0
IspV = 0.8881
}
CONFIG
{
name = WasteWater-1000K
specLevel = operational
thrusterPower = 0.0014
PROPELLANT
{
ratio = 1.0
name = WasteWater
DrawGauge = True
}
PROPELLANT
{
name = CarbonDioxide
ratio = 11.25
ignoreForIsp = True
}
PROPELLANT
{
name = ElectricCharge
ratio = 1618 //Heating water from 273 to 1073K at 90% eff. RPA enthalpy calcs
DrawGauge = True
minResToLeave = 10.0
}

IspSL = 0.0
IspV = 0.5410
}
CONFIG
{
name = WasteWater-2000K
specLevel = operational
thrusterPower = 0.0008
PROPELLANT
{
ratio = 1.0
name = WasteWater
DrawGauge = True
}
PROPELLANT
{
name = CarbonDioxide
ratio = 11.25
ignoreForIsp = True
}
PROPELLANT
{
name = ElectricCharge
ratio = 4599 //Heating water from 273 to 2073K at 90% eff. RPA enthalpy calcs
DrawGauge = True
minResToLeave = 10.0
}

IspSL = 0.0
IspV = 0.8693
}
CONFIG
{
name = Hydrazine-Arcjet
name = Hydrazine-2000K
specLevel = operational
thrusterPower = 0.0045
thrusterPower = 0.001
PROPELLANT
{
ratio = 1.0
Expand All @@ -60,21 +352,21 @@

PROPELLANT
{
name = Helium
ratio = 15.0
name = Nitrogen
ratio = 11.25
ignoreForIsp = True
}

PROPELLANT
{
name = ElectricCharge
ratio = 24559
ratio = 3878
DrawGauge = True
minResToLeave = 10.0
}

IspSL = 0.5
IspV = 1.76205
IspSL = 0.0
IspV = 0.9225
}
}
}
Expand Down
1 change: 1 addition & 0 deletions GameData/RealismOverhaul/RO_SuggestedMods/ROMods/ROEngines.cfg
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Original file line number Diff line number Diff line change
Expand Up @@ -234,3 +234,4 @@
@PART[ROE-Agena_EquipmentRack]:FOR[RealismOverhaul] { %RSSROConfig = true }
@PART[ROE-AgenaSPS]:FOR[RealismOverhaul] { %RSSROConfig = true }
@PART[ROE-ModularRCS]:FOR[RealismOverhaul] { %RSSROConfig = true }
@PART[ROE-ModularResistojetRCS]:FOR[RealismOverhaul] { %RSSROConfig = true }
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