Add XLR81-BA-1 (#3045)

KSP-RO · Feb 15, 2025 · e05c585 · e05c585
1 parent d2895e5
commit e05c585
Showing 1 changed file with 91 additions and 10 deletions.
diff --git a/GameData/RealismOverhaul/Engine_Configs/Agena_XLR81_Config.cfg b/GameData/RealismOverhaul/Engine_Configs/Agena_XLR81_Config.cfg
@@ -7,7 +7,7 @@
 //	Model 117
 //	B-58 Hustler rocket pod
 //
-//	Dry Mass: 114.3 Kg	a little lighter, because no Gimbal
+//	Dry Mass: 100 kg		Even lighter than X-15 engine b/c no safety equipment. 100 kg?
 //	Thrust (SL): ??? kN
 //	Thrust (Vac): 67 kN
 //	ISP: 207 SL / 265.5 Vac		SL calculated with RPA
@@ -19,6 +19,21 @@
 //	Nozzle Ratio: 15
 //	Ignitions: 1
 //	=================================================================================
+//	XLR81-BA-1
+//	Bell Model ????, X-15 proposed engine
+//
+//	Dry Mass: 107.5 kg		3xXLR81 would be 200 lbs lighter than XLR30 [B, p.71]. XLR30 is 910 lbs [B, p.205], so 237 lbs per XLR81?
+//	Thrust (SL): ??? kN
+//	Thrust (Vac): 64.5 kN		14,500 lbf
+//	ISP: 207 SL / 265.5 Vac		SL calculated with RPA
+//	Burn Time: 180		same runtime as XLR99?
+//	Chamber Pressure: 3.4 MPa
+//	Propellant: IRFNA-III / JP-4
+//	Prop Ratio: 2.55	(same as Hustler engine?)
+//	Throttle: 50% selectable
+//	Nozzle Ratio: 15
+//	Ignitions: 1			no restart?
+//	=================================================================================
 //	XLR81-BA-3
 //	Bell Model 8001, Agena Prototype
 //
@@ -192,6 +207,8 @@
 //	(7)	AIAA DESIGN AND TEST RESULTS ON AGENA 2000 - https://www.pdf-archive.com/2017/05/31/design-and-test-results-on-agena-2000/design-and-test-results-on-agena-2000.pdf
 //	(8) https://arc.aiaa.org/doi/abs/10.2514/3.62175?journalCode=jsr
 //      [A] History of Liquid Propellant Rocket Engines, George P. Sutton, Page 519 Table 7.11-2
+//	[B] X-15 Extending the Frontiers of Flight, Dennis R. Jenkins
+//  https://ntrs.nasa.gov/api/citations/20080008340/downloads/20080008340.pdf
 
 //	Used by:
 
@@ -247,7 +264,7 @@
 			minThrust = 67
 			heatProduction = 100
 			gimbalRange = 0
-			massMult = 0.9
+			massMult = 0.7874
 			PROPELLANT
 			{
 				name = Kerosene
@@ -264,7 +281,7 @@
 				key = 0 265.5
 				key = 1 207
 			}
-			ullage = True
+			ullage = False		//probably had a sump for starting
 			pressureFed = False
 			ignitions = 1
 			IGNITOR_RESOURCE
@@ -289,6 +306,70 @@
 			}
 		}
 		CONFIG
+		{
+			name = XLR81-BA-1
+			description = Proposed engine for X-15 program, with a recirculation valve to allow operation at 50% throttle.
+			specLevel = prototype	//presumably tested, but never flew
+			maxThrust = 64.5
+			minThrust = 32.25
+			heatProduction = 100
+			gimbalRange = 0		//No other X-15 engine had gimbal, so no gimbal
+			massMult = 0.8465
+			//No continuous throttling
+			throttleCurve
+			{
+				key = 0.5 0.5 0 0
+				key = 0.501 1.0 0 0
+			}
+			PROPELLANT
+			{
+				name = Kerosene
+				ratio = 0.4411
+			}
+			PROPELLANT
+			{
+				name = IRFNA-III
+				ratio = 0.5589
+				DrawGauge = True
+			}
+			atmosphereCurve
+			{
+				key = 0 265.5
+				key = 1 207
+			}
+			ullage = False		//probably had a sump for starting
+			pressureFed = False
+			ignitions = 1
+			IGNITOR_RESOURCE
+			{
+				name = ElectricCharge
+				amount = 0.5
+			}
+
+			//Using data from late-model Agenas since this probably would have had a lot more testing 
+			TESTFLIGHT:NEEDS[TestLite|TestFlight]
+			{
+				ratedBurnTime = 3600		// same 1 hour between overhauls as XLR99. XLR81 showed a lot of durability during HDA tests, and used same silica oil system to form protective coating over chamber during operation
+				ratedContinuousBurnTime = 180 // 180s rated burntime at full thrust?
+				safeOverburn = true
+
+				// assume roughly exponential relationship between chamber pressure and lifespan
+				thrustModifier
+				{
+					key = 0.00 0.05 0 0
+					key = 1.00 1.00 3 3
+				}
+
+				ignitionReliabilityStart = 0.985433
+				ignitionReliabilityEnd = 0.997700
+				ignitionDynPresFailMultiplier = 10.0
+				cycleReliabilityStart = 0.986067
+				cycleReliabilityEnd = 0.997800
+				techTransfer = Model117:50
+				reliabilityDataRateMultiplier = 20
+			}
+		}
+		CONFIG
 		{
 			name = XLR81-BA-3
 			description = Model 8001, Agena Prototype
@@ -334,7 +415,7 @@
 				ignitionReliabilityEnd = 0.982500
 				cycleReliabilityStart = 0.883333
 				cycleReliabilityEnd = 0.981579
-				techTransfer = Model117:50
+				techTransfer = XLR81-BA-1,Model117:50
 				reliabilityDataRateMultiplier = 1
 			}
 		}
@@ -385,7 +466,7 @@
 				ignitionReliabilityEnd = 0.982500
 				cycleReliabilityStart = 0.883333
 				cycleReliabilityEnd = 0.981579
-				techTransfer = XLR81-BA-3,Model117:50
+				techTransfer = XLR81-BA-3,XLR81-BA-1,Model117:50
 				reliabilityDataRateMultiplier = 1
 			}
 		}
@@ -450,7 +531,7 @@
 				ignitionDynPresFailMultiplier = 0.1
 				cycleReliabilityStart = 0.948010
 				cycleReliabilityEnd = 0.991791
-				techTransfer = XLR81-BA-5,XLR81-BA-3,Model117:50
+				techTransfer = XLR81-BA-5,XLR81-BA-3,XLR81-BA-1,Model117:50
 				reliabilityDataRateMultiplier = 1
 			}
 		}
@@ -544,7 +625,7 @@
 				ignitionDynPresFailMultiplier = 0.1
 				cycleReliabilityStart = 0.986067
 				cycleReliabilityEnd = 0.997800
-				techTransfer = XLR81-BA-7,XLR81-BA-5,XLR81-BA-3,Model117:50
+				techTransfer = XLR81-BA-7,XLR81-BA-5,XLR81-BA-3,XLR81-BA-1,Model117:50
 				reliabilityDataRateMultiplier = 1
 			}
 		}
@@ -619,7 +700,7 @@
 				ignitionDynPresFailMultiplier = 0.1
 				cycleReliabilityStart = 0.986067
 				cycleReliabilityEnd = 0.997800
-				techTransfer = XLR81-BA-13,XLR81-BA-11,XLR81-BA-7,XLR81-BA-5,XLR81-BA-3,Model117:50
+				techTransfer = XLR81-BA-13,XLR81-BA-11,XLR81-BA-7,XLR81-BA-5,XLR81-BA-3,XLR81-BA-1,Model117:50
 				reliabilityDataRateMultiplier = 1
 			}
 		}
@@ -690,7 +771,7 @@
 				ignitionDynPresFailMultiplier = 0.1
 				cycleReliabilityStart = 0.986067
 				cycleReliabilityEnd = 0.997800
-				techTransfer = Model8096-39,XLR81-BA-13,XLR81-BA-11,XLR81-BA-7,XLR81-BA-5,XLR81-BA-3,Model117:50
+				techTransfer = Model8096-39,XLR81-BA-13,XLR81-BA-11,XLR81-BA-7,XLR81-BA-5,XLR81-BA-3,XLR81-BA-1,Model117:50
 				reliabilityDataRateMultiplier = 1
 			}
 		}
@@ -934,7 +1015,7 @@
 				ignitionDynPresFailMultiplier = 0.1
 				cycleReliabilityStart = 0.958763
 				cycleReliabilityEnd = 0.995
-				techTransfer = XLR81-BA-13,XLR81-BA-11,XLR81-BA-7,XLR81-BA-5,XLR81-BA-3,Model117:20
+				techTransfer = XLR81-BA-13,XLR81-BA-11,XLR81-BA-7,XLR81-BA-5,XLR81-BA-3,XLR81-BA-1,Model117:20
 				reliabilityDataRateMultiplier = 1
 			}
 		}