diff --git a/GameData/RP-1/Tree/ECM-Engines.cfg b/GameData/RP-1/Tree/ECM-Engines.cfg
index c62daf766b..2021446812 100644
--- a/GameData/RP-1/Tree/ECM-Engines.cfg
+++ b/GameData/RP-1/Tree/ECM-Engines.cfg
@@ -464,13 +464,16 @@
     PrincetonLNTR-WCH = 250000,PrincetonLNTR-ZrC
     PrincetonLNTR-ZrC = 250000,LiquidCoreReactors
     R-103 = 0
-    R-11F-300 = 2000,RD-9BF
+    R-11F-300 = 2000,RD-9BF-811
     R-11F2-300 = 2500,R-11F-300
     R-11F2S-300 = 2000,R-11F2-300
-    R-15B-300 = 20000,RD-9BF
+    R-13-300 = 2000,R-11F2S-300
+    R-13F-300 = 2000,R-13-300
+    R-13F2-300 = 2000,R-13F-300
+    R-15B-300 = 20000,RD-9BF-811
     R-15BD-300 = 5000,R-15B-300
     R-15BF2-300 = 20000,R-15BD-300
-    R-25-300 = 1000,R-11F2S-300
+    R-25-300 = 1000,R-13F-300
     R-40A = 0
     R-40A-NTO = 0
     R-40B = 0
@@ -848,6 +851,10 @@
     Vulcain = 320000,HydroloxPumps
     Vulcain-2 = 50000
     WAC-Corporal = 1
+    WP-13 = 2000,R-13-300,WP-7B
+    WP-13A-II = 2000,WP-13
+    WP-13F = 2000,WP-13A-II
+    WP-13FI = 2000,WP-13F
     WP-6 = 250,RD-9B
     WP-6A = 500,RD-9BF-811
     WP-6A-III = 2000,WP-6A
@@ -858,7 +865,7 @@
     WP-7BM = 2000,WP-7B
     WS-10A = 15000,CFM56-2A2
     WS-10B = 5000,WS-10A
-    WS-10B-III = 5000,WP-7B
+    WS-10B-III = 5000,WS-10B
     Waxwing = 10000, SolidsCTPB
     Welland = 1
     X-405 = 9500,XLR10-RM-2,Navaho-PhaseIII-TP
diff --git a/GameData/RP-1/Tree/ECM-Parts.cfg b/GameData/RP-1/Tree/ECM-Parts.cfg
index e916c016c2..cf57bfd7e6 100644
--- a/GameData/RP-1/Tree/ECM-Parts.cfg
+++ b/GameData/RP-1/Tree/ECM-Parts.cfg
@@ -406,6 +406,7 @@
     RO-PPS1350 = PPS-1350
     RO-QuadropoleMassSpectrometer = 2500, RO-MIMS
     RO-R11F = R-11F-300
+    RO-R13 = R-13-300
     RO-R15BD = R-15B-300
     RO-R25F = R-25-300
     RO-RD-0105 = RD-0105
diff --git a/GameData/RP-1/Tree/TREE-Engines.cfg b/GameData/RP-1/Tree/TREE-Engines.cfg
index 50312dbe3a..2d31fd9d02 100644
--- a/GameData/RP-1/Tree/TREE-Engines.cfg
+++ b/GameData/RP-1/Tree/TREE-Engines.cfg
@@ -3034,6 +3034,26 @@
                 *@PARTUPGRADE[RFUpgrade_R-11F2S-300]/deleteme -= 1
             }
 
+            @CONFIG[R-13-300]
+            {
+                %techRequired = advancedJetEngines
+                %cost = 0
+            }
+
+            @CONFIG[R-13F-300]
+            {
+                %techRequired = efficientSupersonic
+                %cost = 2
+                *@PARTUPGRADE[RFUpgrade_R-13F-300]/deleteme -= 1
+            }
+
+            @CONFIG[R-13F2-300]
+            {
+                %techRequired = efficientSupersonic
+                %cost = 2
+                *@PARTUPGRADE[RFUpgrade_R-13F2-300]/deleteme -= 1
+            }
+
             @CONFIG[R-15B-300]
             {
                 %techRequired = advancedJetEngines
@@ -5543,6 +5563,34 @@
                 %cost = 0
             }
 
+            @CONFIG[WP-13]
+            {
+                %techRequired = matureTurbofans
+                %cost = -15
+                *@PARTUPGRADE[RFUpgrade_WP-13]/deleteme -= 1
+            }
+
+            @CONFIG[WP-13A-II]
+            {
+                %techRequired = refinedTurbofans
+                %cost = 14
+                *@PARTUPGRADE[RFUpgrade_WP-13A-II]/deleteme -= 1
+            }
+
+            @CONFIG[WP-13F]
+            {
+                %techRequired = refinedTurbofans
+                %cost = 4
+                *@PARTUPGRADE[RFUpgrade_WP-13F]/deleteme -= 1
+            }
+
+            @CONFIG[WP-13FI]
+            {
+                %techRequired = refinedTurbofans
+                %cost = 6
+                *@PARTUPGRADE[RFUpgrade_WP-13FI]/deleteme -= 1
+            }
+
             @CONFIG[WP-6]
             {
                 %techRequired = highSpeedFlight
@@ -15869,6 +15917,86 @@ PART
 {
 }
 
+PARTUPGRADE
+{
+        name = RFUpgrade_R-13F-300
+        partIcon = RO-H1-RS27 // FIXME Once we get dedicated model
+        techRequired = efficientSupersonic
+        entryCost = 0
+        cost = 0      
+        title = R13 Engine Upgrade: R-13F-300 Config
+        basicInfo = Engine Performance Upgrade
+        manufacturer = Engine Upgrade
+        deleteme = 1
+        description = The R13 Engine now supports the R-13F-300 configuration for increased performance. Unlock it in the VAB/SPH through the engine configs interface.\n\n
+}
+
+PART
+{
+    name = RFUpgrade_engineConfigSource_R-13F-300
+    engineType = R13
+}
+
+@PART[RFUpgrade_engineConfigSource_R-13F-300]:AFTER[RealismOverhaulEngines]
+{
+    %MODULE[Module*EngineConfigs] {
+        @name = ModuleEngineConfigs
+        %CONFIG[R-13F-300] {
+            &specLevel = operational
+        }
+    }
+}
+
+@PARTUPGRADE[RFUpgrade_R-13F-300]:AFTER[RealismOverhaulEngines]
+{
+    %description = #$description$\nAvailable at specLevel $@PART[RFUpgrade_engineConfigSource_R-13F-300]/MODULE[ModuleEngineConfigs]/CONFIG[R-13F-300]/specLevel$
+    // TODO: could add any number of other useful fields from the CONFIG here. cost? description?
+}
+
+!PART[RFUpgrade_engineConfigSource_R-13F-300]:AFTER[RealismOverhaulEngines]
+{
+}
+
+PARTUPGRADE
+{
+        name = RFUpgrade_R-13F2-300
+        partIcon = RO-H1-RS27 // FIXME Once we get dedicated model
+        techRequired = efficientSupersonic
+        entryCost = 0
+        cost = 0      
+        title = R13 Engine Upgrade: R-13F2-300 Config
+        basicInfo = Engine Performance Upgrade
+        manufacturer = Engine Upgrade
+        deleteme = 1
+        description = The R13 Engine now supports the R-13F2-300 configuration for increased performance. Unlock it in the VAB/SPH through the engine configs interface.\n\n
+}
+
+PART
+{
+    name = RFUpgrade_engineConfigSource_R-13F2-300
+    engineType = R13
+}
+
+@PART[RFUpgrade_engineConfigSource_R-13F2-300]:AFTER[RealismOverhaulEngines]
+{
+    %MODULE[Module*EngineConfigs] {
+        @name = ModuleEngineConfigs
+        %CONFIG[R-13F2-300] {
+            &specLevel = operational
+        }
+    }
+}
+
+@PARTUPGRADE[RFUpgrade_R-13F2-300]:AFTER[RealismOverhaulEngines]
+{
+    %description = #$description$\nAvailable at specLevel $@PART[RFUpgrade_engineConfigSource_R-13F2-300]/MODULE[ModuleEngineConfigs]/CONFIG[R-13F2-300]/specLevel$
+    // TODO: could add any number of other useful fields from the CONFIG here. cost? description?
+}
+
+!PART[RFUpgrade_engineConfigSource_R-13F2-300]:AFTER[RealismOverhaulEngines]
+{
+}
+
 PARTUPGRADE
 {
         name = RFUpgrade_R-15BD-300
@@ -23629,6 +23757,166 @@ PART
 {
 }
 
+PARTUPGRADE
+{
+        name = RFUpgrade_WP-13
+        partIcon = RO-H1-RS27 // FIXME Once we get dedicated model
+        techRequired = matureTurbofans
+        entryCost = 0
+        cost = 0      
+        title = R13 Engine Upgrade: WP-13 Config
+        basicInfo = Engine Performance Upgrade
+        manufacturer = Engine Upgrade
+        deleteme = 1
+        description = The R13 Engine now supports the WP-13 configuration for increased performance. Unlock it in the VAB/SPH through the engine configs interface.\n\n
+}
+
+PART
+{
+    name = RFUpgrade_engineConfigSource_WP-13
+    engineType = R13
+}
+
+@PART[RFUpgrade_engineConfigSource_WP-13]:AFTER[RealismOverhaulEngines]
+{
+    %MODULE[Module*EngineConfigs] {
+        @name = ModuleEngineConfigs
+        %CONFIG[WP-13] {
+            &specLevel = operational
+        }
+    }
+}
+
+@PARTUPGRADE[RFUpgrade_WP-13]:AFTER[RealismOverhaulEngines]
+{
+    %description = #$description$\nAvailable at specLevel $@PART[RFUpgrade_engineConfigSource_WP-13]/MODULE[ModuleEngineConfigs]/CONFIG[WP-13]/specLevel$
+    // TODO: could add any number of other useful fields from the CONFIG here. cost? description?
+}
+
+!PART[RFUpgrade_engineConfigSource_WP-13]:AFTER[RealismOverhaulEngines]
+{
+}
+
+PARTUPGRADE
+{
+        name = RFUpgrade_WP-13A-II
+        partIcon = RO-H1-RS27 // FIXME Once we get dedicated model
+        techRequired = refinedTurbofans
+        entryCost = 0
+        cost = 0      
+        title = R13 Engine Upgrade: WP-13A-II Config
+        basicInfo = Engine Performance Upgrade
+        manufacturer = Engine Upgrade
+        deleteme = 1
+        description = The R13 Engine now supports the WP-13A-II configuration for increased performance. Unlock it in the VAB/SPH through the engine configs interface.\n\n
+}
+
+PART
+{
+    name = RFUpgrade_engineConfigSource_WP-13A-II
+    engineType = R13
+}
+
+@PART[RFUpgrade_engineConfigSource_WP-13A-II]:AFTER[RealismOverhaulEngines]
+{
+    %MODULE[Module*EngineConfigs] {
+        @name = ModuleEngineConfigs
+        %CONFIG[WP-13A-II] {
+            &specLevel = operational
+        }
+    }
+}
+
+@PARTUPGRADE[RFUpgrade_WP-13A-II]:AFTER[RealismOverhaulEngines]
+{
+    %description = #$description$\nAvailable at specLevel $@PART[RFUpgrade_engineConfigSource_WP-13A-II]/MODULE[ModuleEngineConfigs]/CONFIG[WP-13A-II]/specLevel$
+    // TODO: could add any number of other useful fields from the CONFIG here. cost? description?
+}
+
+!PART[RFUpgrade_engineConfigSource_WP-13A-II]:AFTER[RealismOverhaulEngines]
+{
+}
+
+PARTUPGRADE
+{
+        name = RFUpgrade_WP-13F
+        partIcon = RO-H1-RS27 // FIXME Once we get dedicated model
+        techRequired = refinedTurbofans
+        entryCost = 0
+        cost = 0      
+        title = R13 Engine Upgrade: WP-13F Config
+        basicInfo = Engine Performance Upgrade
+        manufacturer = Engine Upgrade
+        deleteme = 1
+        description = The R13 Engine now supports the WP-13F configuration for increased performance. Unlock it in the VAB/SPH through the engine configs interface.\n\n
+}
+
+PART
+{
+    name = RFUpgrade_engineConfigSource_WP-13F
+    engineType = R13
+}
+
+@PART[RFUpgrade_engineConfigSource_WP-13F]:AFTER[RealismOverhaulEngines]
+{
+    %MODULE[Module*EngineConfigs] {
+        @name = ModuleEngineConfigs
+        %CONFIG[WP-13F] {
+            &specLevel = operational
+        }
+    }
+}
+
+@PARTUPGRADE[RFUpgrade_WP-13F]:AFTER[RealismOverhaulEngines]
+{
+    %description = #$description$\nAvailable at specLevel $@PART[RFUpgrade_engineConfigSource_WP-13F]/MODULE[ModuleEngineConfigs]/CONFIG[WP-13F]/specLevel$
+    // TODO: could add any number of other useful fields from the CONFIG here. cost? description?
+}
+
+!PART[RFUpgrade_engineConfigSource_WP-13F]:AFTER[RealismOverhaulEngines]
+{
+}
+
+PARTUPGRADE
+{
+        name = RFUpgrade_WP-13FI
+        partIcon = RO-H1-RS27 // FIXME Once we get dedicated model
+        techRequired = refinedTurbofans
+        entryCost = 0
+        cost = 0      
+        title = R13 Engine Upgrade: WP-13FI Config
+        basicInfo = Engine Performance Upgrade
+        manufacturer = Engine Upgrade
+        deleteme = 1
+        description = The R13 Engine now supports the WP-13FI configuration for increased performance. Unlock it in the VAB/SPH through the engine configs interface.\n\n
+}
+
+PART
+{
+    name = RFUpgrade_engineConfigSource_WP-13FI
+    engineType = R13
+}
+
+@PART[RFUpgrade_engineConfigSource_WP-13FI]:AFTER[RealismOverhaulEngines]
+{
+    %MODULE[Module*EngineConfigs] {
+        @name = ModuleEngineConfigs
+        %CONFIG[WP-13FI] {
+            &specLevel = operational
+        }
+    }
+}
+
+@PARTUPGRADE[RFUpgrade_WP-13FI]:AFTER[RealismOverhaulEngines]
+{
+    %description = #$description$\nAvailable at specLevel $@PART[RFUpgrade_engineConfigSource_WP-13FI]/MODULE[ModuleEngineConfigs]/CONFIG[WP-13FI]/specLevel$
+    // TODO: could add any number of other useful fields from the CONFIG here. cost? description?
+}
+
+!PART[RFUpgrade_engineConfigSource_WP-13FI]:AFTER[RealismOverhaulEngines]
+{
+}
+
 PARTUPGRADE
 {
         name = RFUpgrade_WP-6
diff --git a/GameData/RP-1/Tree/TREE-Parts.cfg b/GameData/RP-1/Tree/TREE-Parts.cfg
index b52451053e..62cbdfcba5 100644
--- a/GameData/RP-1/Tree/TREE-Parts.cfg
+++ b/GameData/RP-1/Tree/TREE-Parts.cfg
@@ -6629,6 +6629,14 @@
     RP0conf = true
     @description ^=:$: <b><color=green>From Advanced Jet Engines mod</color></b>
 }
+@PART[RO-R13]:FOR[xxxRP0]
+{
+    %TechRequired = advancedJetEngines
+    %cost = 436
+    %entryCost = 0
+    RP0conf = true
+    @description ^=:$: <b><color=green>From Advanced Jet Engines mod</color></b>
+}
 @PART[RO-R15BD]:FOR[xxxRP0]
 {
     %TechRequired = advancedJetEngines
diff --git a/Source/Tech Tree/Parts Browser/data/Advanced_Jet_Engines.json b/Source/Tech Tree/Parts Browser/data/Advanced_Jet_Engines.json
index d634f547ed..c2af24d907 100644
--- a/Source/Tech Tree/Parts Browser/data/Advanced_Jet_Engines.json	
+++ b/Source/Tech Tree/Parts Browser/data/Advanced_Jet_Engines.json	
@@ -240,6 +240,27 @@
         "identical_part_name": "",
         "module_tags": []
     },
+    {
+        "name": "RO-R13",
+        "title": "R-13 Turbojet",
+        "description": "",
+        "mod": "Advanced Jet Engines",
+        "cost": "436",
+        "entry_cost": "0",
+        "category": "FLIGHT",
+        "info": "Engine",
+        "year": "1968",
+        "technology": "advancedJetEngines",
+        "ro": true,
+        "orphan": false,
+        "rp0_conf": true,
+        "spacecraft": "",
+        "engine_config": "R13",
+        "upgrade": false,
+        "entry_cost_mods": "R-13-300",
+        "identical_part_name": "",
+        "module_tags": []
+    },
     {
         "name": "RO-R25F",
         "title": "R-25 Turbojet",
@@ -249,7 +270,7 @@
         "entry_cost": 0,
         "category": "FLIGHT",
         "info": "Engine",
-        "year": "1971",
+        "year": "1972",
         "technology": "efficientSupersonic",
         "era": "",
         "ro": true,
diff --git a/Source/Tech Tree/Parts Browser/data/Engine_Config.json b/Source/Tech Tree/Parts Browser/data/Engine_Config.json
index b08a08a524..2641a0a348 100644
--- a/Source/Tech Tree/Parts Browser/data/Engine_Config.json	
+++ b/Source/Tech Tree/Parts Browser/data/Engine_Config.json	
@@ -10008,7 +10008,7 @@
         "spacecraft": "",
         "engine_config": "R11",
         "upgrade": false,
-        "entry_cost_mods": "2000,RD-9BF",
+        "entry_cost_mods": "2000,RD-9BF-811",
         "identical_part_name": "",
         "module_tags": []
     },
@@ -10056,6 +10056,69 @@
         "identical_part_name": "",
         "module_tags": []
     },
+    {
+        "name": "R-13-300",
+        "title": "R-13-300",
+        "description": "",
+        "mod": "Engine_Config",
+        "cost": "0",
+        "entry_cost": "0",
+        "category": "FLIGHT",
+        "info": "",
+        "year": "1968",
+        "technology": "advancedJetEngines",
+        "ro": true,
+        "orphan": false,
+        "rp0_conf": true,
+        "spacecraft": "",
+        "engine_config": "R13",
+        "upgrade": false,
+        "entry_cost_mods": "2000,R-11F2S-300",
+        "identical_part_name": "",
+        "module_tags": []
+    },
+    {
+        "name": "R-13F-300",
+        "title": "R-13F-300",
+        "description": "",
+        "mod": "Engine_Config",
+        "cost": "2",
+        "entry_cost": "0",
+        "category": "FLIGHT",
+        "info": "",
+        "year": "1970",
+        "technology": "efficientSupersonic",
+        "ro": true,
+        "orphan": false,
+        "rp0_conf": true,
+        "spacecraft": "",
+        "engine_config": "R13",
+        "upgrade": true,
+        "entry_cost_mods": "2000,R-13-300",
+        "identical_part_name": "",
+        "module_tags": []
+    },
+    {
+        "name": "R-13F2-300",
+        "title": "R-13F2-300",
+        "description": "",
+        "mod": "Engine_Config",
+        "cost": "2",
+        "entry_cost": "0",
+        "category": "FLIGHT",
+        "info": "",
+        "year": "1971",
+        "technology": "efficientSupersonic",
+        "ro": true,
+        "orphan": false,
+        "rp0_conf": true,
+        "spacecraft": "",
+        "engine_config": "R13",
+        "upgrade": true,
+        "entry_cost_mods": "2000,R-13F-300",
+        "identical_part_name": "",
+        "module_tags": []
+    },
     {
         "name": "R-15B-300",
         "title": "R-15B-300",
@@ -10074,7 +10137,7 @@
         "spacecraft": "",
         "engine_config": "R15",
         "upgrade": false,
-        "entry_cost_mods": "20000,RD-9BF",
+        "entry_cost_mods": "20000,RD-9BF-811",
         "identical_part_name": "",
         "module_tags": []
     },
@@ -10131,7 +10194,7 @@
         "entry_cost": 0,
         "category": "FLIGHT",
         "info": "",
-        "year": "1971",
+        "year": "1972",
         "technology": "efficientSupersonic",
         "era": "",
         "ro": true,
@@ -10140,7 +10203,7 @@
         "spacecraft": "",
         "engine_config": "R25",
         "upgrade": false,
-        "entry_cost_mods": "1000,R-11F2S-300",
+        "entry_cost_mods": "1000,R-13F-300",
         "identical_part_name": "",
         "module_tags": []
     },
@@ -18434,6 +18497,90 @@
         "identical_part_name": "",
         "module_tags": []
     },
+    {
+        "name": "WP-13",
+        "title": "WP-13",
+        "description": "",
+        "mod": "Engine_Config",
+        "cost": "-15",
+        "entry_cost": "0",
+        "category": "FLIGHT",
+        "info": "",
+        "year": "1984",
+        "technology": "matureTurbofans",
+        "ro": true,
+        "orphan": false,
+        "rp0_conf": true,
+        "spacecraft": "",
+        "engine_config": "R13",
+        "upgrade": true,
+        "entry_cost_mods": "2000,R-13-300,WP-7B",
+        "identical_part_name": "",
+        "module_tags": []
+    },
+    {
+        "name": "WP-13A-II",
+        "title": "WP-13A-II",
+        "description": "",
+        "mod": "Engine_Config",
+        "cost": "14",
+        "entry_cost": "0",
+        "category": "FLIGHT",
+        "info": "",
+        "year": "1988",
+        "technology": "refinedTurbofans",
+        "ro": true,
+        "orphan": false,
+        "rp0_conf": true,
+        "spacecraft": "",
+        "engine_config": "R13",
+        "upgrade": true,
+        "entry_cost_mods": "2000,WP-13",
+        "identical_part_name": "",
+        "module_tags": []
+    },
+    {
+        "name": "WP-13F",
+        "title": "WP-13F",
+        "description": "",
+        "mod": "Engine_Config",
+        "cost": "4",
+        "entry_cost": "0",
+        "category": "FLIGHT",
+        "info": "",
+        "year": "1989",
+        "technology": "refinedTurbofans",
+        "ro": true,
+        "orphan": false,
+        "rp0_conf": true,
+        "spacecraft": "",
+        "engine_config": "R13",
+        "upgrade": true,
+        "entry_cost_mods": "2000,WP-13A-II",
+        "identical_part_name": "",
+        "module_tags": []
+    },
+    {
+        "name": "WP-13FI",
+        "title": "WP-13FI",
+        "description": "",
+        "mod": "Engine_Config",
+        "cost": "6",
+        "entry_cost": "0",
+        "category": "FLIGHT",
+        "info": "",
+        "year": "1994",
+        "technology": "refinedTurbofans",
+        "ro": true,
+        "orphan": false,
+        "rp0_conf": true,
+        "spacecraft": "",
+        "engine_config": "R13",
+        "upgrade": true,
+        "entry_cost_mods": "2000,WP-13F",
+        "identical_part_name": "",
+        "module_tags": []
+    },
     {
         "name": "WP-6",
         "title": "WP-6",
@@ -18661,7 +18808,7 @@
         "spacecraft": "",
         "engine_config": "WS10",
         "upgrade": true,
-        "entry_cost_mods": "5000,WP-7B",
+        "entry_cost_mods": "5000,WS-10B",
         "identical_part_name": "",
         "module_tags": []
     },
diff --git a/Source/Tech Tree/Parts Browser/data/Stock__RO_Addition.json b/Source/Tech Tree/Parts Browser/data/Stock__RO_Addition.json
index a8a66251a3..3c151b544f 100644
--- a/Source/Tech Tree/Parts Browser/data/Stock__RO_Addition.json	
+++ b/Source/Tech Tree/Parts Browser/data/Stock__RO_Addition.json	
@@ -93,7 +93,7 @@
     },
     {
         "name": "RO-WS10",
-        "title": "",
+        "title": "WS-10 Low-Bypass Turbofan",
         "description": "",
         "mod": "Stock (RO Addition)",
         "cost": "750",