Add A-136 nuclear turbojet

KSP-RO · Feb 6, 2025 · 6b45536 · 6b45536
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diff --git a/GameData/RealismOverhaul/Engine_Configs/Jet_Engine_Configs/A136_Config.cfg b/GameData/RealismOverhaul/Engine_Configs/Jet_Engine_Configs/A136_Config.cfg
@@ -0,0 +1,201 @@
+//	==================================================
+//	Engine: A-136
+//
+//	Manufacturer: General Electric
+//
+//	=================================================================================
+//	A-136 (dry)
+//	1964, XB-70
+//
+//	Dry Mass: 21364 kg
+//	Thrust (Dry): 104.8 kN		29,000 lbf static - ~5440 lbs chemical burner = 23,560 lbf
+//	Thrust (Wet): N/A kN
+//	SFC (Dry): 6.37e-7 lb/lbf-hr	15 lbs U-235 / 23,560 lbf * 1000 hr
+//	Area: 0.5 m^2	//Compressor Area
+//	BPR: 0.0		//Bypass Ratio
+//	CPR: 14.26		//Compressor Pressure Ratio
+//	FPR: 0.0		//Fan Ratio
+//	Mdes: 0.3 M		//Mach Design Point
+//	Tdes: 280 K		//Temp Design Point
+//	eta_n: 0.94		//Efficiency at afterburner rear / nozzle entrance
+//	FHV: 25000000 J	//Fuel heat of burning
+//	TIT: 1704 K		//Combustion peak temp	TIT is actually 1422 K, but since most air flow doesn't actually pass through the core, use a higher value to get thrust curve to behave
+//	TAB: N/A K		//Afterburner peak temp
+//	maxT3: 1015 K	//Turbine max temperature	says 988 K, but we need 1015 K to get to Mach 3.3
+//	Exhaust Mixer: false
+//	Adjustable Nozzle: true
+//	=================================================================================
+
+//	Sources:
+
+//	https://www.osti.gov/biblio/1821648
+
+//	Used by:
+
+//	Notes:
+
+//	length 33.6 feet
+//	max diameter 99.75 inches
+//	47,100 lbs total mass with copper reactor shield
+//	796 lbs of U-235 in core, with a burnup of 15 lbs expected at 1000 hrs
+//	164 MW design power, 224 MW peak power
+//	Chemical inter-burners for takeoff:
+//	60 lbs/s airflow, 2.2 lbs/s fuel flow, TIT increased to 2100 F
+//	From NASA engine sim, at specified air and fuel flow, thrust 5440 lbs, TSFC 1.456 lb/lbf-hr
+//	Operation:
+//	All air flow passes through the compressor. A large portion of the airflow passes through the reactor
+//	And out the center "ramjet" nozzle, contributing to the largest fraction of engine thrust. A portion
+//	of air passes through the reactor in the opposite direction, where it is mixed with compressor tap-off
+//	air for cooling and used to drive the turbine, before being passed through the outer "turbojet" nozzle.
+//	The chemical inter-burners also use compressor tap-off air, and exhaust into the turbine as well.
+//	==================================================
+@PART[*]:HAS[#engineType[A136]]:FOR[RealismOverhaulEngines]
+{
+
+	%title = #roJ93Title	//J93 Turbojet
+	%manufacturer = #roMfrGE
+	%description = #roJ93Desc
+
+	@tags ^= :$: usa general electric ge j93 afterburning turbojet
+
+	%specLevel = operational	//operational, prototype, concept, speculative, altHist, sciFi
+
+	@MODULE[ModuleEngines*]
+	{
+		@name = ModuleEnginesAJEJet
+		%EngineType = Turbine
+		!wetThrust = null
+		!TAB = null
+		@PROPELLANT[LiquidFuel]
+		{
+			@name = Kerosene
+		}
+	}
+	@MODULE[ModuleAlternator]
+	{
+		@RESOURCE[ElectricCharge]
+		{
+			%rate = 50.0
+		}
+	}
+	//AJE does not like engines with 0 fuel flow
+	//constantly generate a fake resource so we have some mass flow
+	MODULE
+	{
+		name = ModuleResourceIntake
+		resourceName = PlaceholderAir
+		checkForOxygen = false
+		area = 1
+		intakeSpeed = 50
+		intakeTransformName = thrustTransform //Intake  
+	}
+
+	RESOURCE
+	{
+		name = PlaceholderAir
+		amount = 5.0
+		maxAmount = 5.0
+	}
+	//15 lbs Uranium
+	RESOURCE
+	{
+		name = EnrichedUranium
+		amount = 0.6202
+		maxAmount = 0.6202
+	}
+
+	!MODULE[ModuleGimbal]{}
+
+	MODULE
+	{
+		name = ModuleBimodalEngineConfigs
+		type = ModuleEnginesAJEJet
+		configuration = A-136
+		modded = false
+		origMass = 21.364
+
+		primaryDescription = Kerosene Burner Off
+		secondaryDescription = Kerosene Burner On
+		toPrimaryText = Disengage Kerosene Injection
+		toSecondaryText = Engage Kerosene Injection
+
+		CONFIG
+		{
+			name = A-136
+			description = J93-GE-3, as used on the XB-70. Temperature Mach limit at 15 km: 3.35.
+			specLevel = operational
+			massMult = 1.00
+			
+			Area = 0.5		//Compressor Area
+			BPR = 0.0		//Bypass Ratio
+			CPR = 14.26		//Compressor Pressure Ratio
+			FPR = 0.0		//Fan Ratio
+			Mdes = 0.3		//Mach Design Point
+			Tdes = 280		//Temp Design Point
+			eta_c = 0.95	//Efficiency at burner inlet
+			eta_t = 0.98	//Efficiency at burner exit
+			eta_n = 0.94		//Efficiency at afterburner rear / nozzle entrance
+			FHV = 25000000	//Fuel heat of burning (joules?)
+			TIT = 1704		//Combustion peak temp
+			TAB = 0		//Afterburner temp?
+			maxT3 = 1015		//Turbine max temperature
+			exhaustMixer = False
+			adjustableNozzle = True
+			thrustUpperLimit = 150
+			
+			// Engine fitting params
+			defaultTPR = 0.85
+			dryThrust = 104.8
+			wetThrust = 0.0
+			maxThrust = 104.8	//Just to let MEC know thrust
+			drySFC = 1.0		//Doesn't matter, so just set to 1
+			throttleResponseMultiplier = 0.05
+
+			PROPELLANT
+			{
+				name = EnrichedUranium
+				ratio = 0.00000025
+				DrawGauge = False
+			}
+			PROPELLANT
+			{
+				name = PlaceholderAir
+				ratio = 1.0
+				DrawGauge = False
+			}
+			SUBCONFIG
+			{
+				name = A-136-Wet
+
+				dryThrust = 129		//29,000 lbf static
+				maxThrust = 129
+				throttleResponseMultiplier = 0.25	//kerosene burner used to quickly spool turbine
+
+				PROPELLANT
+				{
+					name = Kerosene
+					ratio = 2.478		//2.2 lbs/s (1.22 L/s) static
+					DrawGauge = True
+				}
+				PROPELLANT
+				{
+					name = EnrichedUranium
+					ratio = 0.00000025
+					DrawGauge = False
+				}
+				PROPELLANT
+				{
+					name = PlaceholderAir
+					ratio = 1.0
+					DrawGauge = False
+				}
+			}
+		}
+	}
+}
+
++PART[turboFanEngine]:BEFORE[RealismOverhaulEngines]
+{
+	@name = RO-A136
+	@engineType = A136
+}
diff --git a/GameData/RealismOverhaul/RO_Resources.cfg b/GameData/RealismOverhaul/RO_Resources.cfg
@@ -171,6 +171,21 @@ RESOURCE_DEFINITION
     showDrainFX = false
   }
 }
+//create a placeholder resource to trick AJE into accepting engines with 0 mass flow (electric and nuclear)
+RESOURCE_DEFINITION
+{
+	name = PlaceholderAir
+	density = 0.005
+	flowMode = ALL_VESSEL
+	transfer = PUMP
+	isTweakable = false
+	isVisible = false
+	RESOURCE_DRAIN_DEFINITION
+	{
+		isDrainable = false
+		showDrainFX = false
+	}
+}
 
 // Create new Kerosenes, change old Kerosene to JP-4 or the like.
 @RESOURCE_DEFINITION[Kerosene]:FOR[RealismOverhaul]