diff --git a/GameData/AJE/AJE.version b/GameData/AJE/AJE.version
index 748a928..9285661 100644
--- a/GameData/AJE/AJE.version
+++ b/GameData/AJE/AJE.version
@@ -9,12 +9,17 @@
   "VERSION" : {
     "MAJOR" : 2,
     "MINOR" : 7,
-    "PATCH" : 2,
+    "PATCH" : 1,
     "BUILD" : 0
   },
-  "KSP_VERSION" : {
+  "KSP_VERSION_MIN" : {
     "MAJOR" : 1,
     "MINOR" : 1,
-    "PATCH" : 3
+    "PATCH" : 2
+  },
+  "KSP_VERSION_MAX" : {
+    "MAJOR" : 1,
+    "MINOR" : 1,
+    "PATCH" : 2
   }
 }
diff --git a/GameData/AJE/Plugins/AJE.dll b/GameData/AJE/Plugins/AJE.dll
index 597242e..0dbafc2 100644
Binary files a/GameData/AJE/Plugins/AJE.dll and b/GameData/AJE/Plugins/AJE.dll differ
diff --git a/GameData/SolverEngines/Plugins/SolverEngines.dll b/GameData/SolverEngines/Plugins/SolverEngines.dll
index e762b66..980e587 100644
Binary files a/GameData/SolverEngines/Plugins/SolverEngines.dll and b/GameData/SolverEngines/Plugins/SolverEngines.dll differ
diff --git a/GameData/SolverEngines/Readme_SolverEngines.txt b/GameData/SolverEngines/Readme_SolverEngines.txt
index 98ebd9f..1591b7f 100644
--- a/GameData/SolverEngines/Readme_SolverEngines.txt
+++ b/GameData/SolverEngines/Readme_SolverEngines.txt
@@ -29,16 +29,11 @@ See AJE or RealFuels for examples of how to implement SolverEngines in practice.
 
 Changelog:
 
-V2.3
-* Revert AssemblyVersion to 2.1.0.0 since latest releases of AJE and RF depend on it
-
-v2.2
-* Recompile against KSP 1.1.3
-
 v2.1
 * Update for KSP 1.1.2
 
 v2.0
+
 * Updated for KSP 1.1
 * Support variable thrust per transform as in ModuleEngines
 
diff --git a/GameData/SolverEngines/SolverEngines.version b/GameData/SolverEngines/SolverEngines.version
index 4ecac71..e7bde58 100644
--- a/GameData/SolverEngines/SolverEngines.version
+++ b/GameData/SolverEngines/SolverEngines.version
@@ -8,13 +8,18 @@
   },
   "VERSION" : {
     "MAJOR" : 2,
-    "MINOR" : 3,
+    "MINOR" : 1,
     "PATCH" : 0,
     "BUILD" : 0
   },
-  "KSP_VERSION" : {
+  "KSP_VERSION_MIN" : {
+    "MAJOR" : 1,
+    "MINOR" : 1,
+    "PATCH" : 2
+  },
+  "KSP_VERSION_MAX" : {
     "MAJOR" : 1,
     "MINOR" : 1,
-    "PATCH" : 3
+    "PATCH" : 2
   }
 }
diff --git a/Source/AJE.csproj b/Source/AJE.csproj
index f1d4b4e..412d534 100644
--- a/Source/AJE.csproj
+++ b/Source/AJE.csproj
@@ -53,18 +53,22 @@
   </ItemGroup>
   <ItemGroup>
     <Reference Include="Assembly-CSharp">
+      <HintPath>..\..\..\..\..\..\Games\KSP_win1\KSP_x64_Data\Managed\Assembly-CSharp.dll</HintPath>
       <Private>False</Private>
     </Reference>
     <Reference Include="KSPUtil">
+      <HintPath>..\..\..\..\..\..\Games\KSP_win1\KSP_x64_Data\Managed\KSPUtil.dll</HintPath>
       <Private>False</Private>
     </Reference>
     <Reference Include="SolverEngines">
+      <HintPath>..\..\SolverEngines\GameData\SolverEngines\Plugins\SolverEngines.dll</HintPath>
       <Private>False</Private>
     </Reference>
     <Reference Include="System">
       <Private>False</Private>
     </Reference>
     <Reference Include="UnityEngine">
+      <HintPath>..\..\..\..\..\..\Games\KSP_win1\KSP_x64_Data\Managed\UnityEngine.dll</HintPath>
       <Private>False</Private>
     </Reference>
   </ItemGroup>
diff --git a/Source/AJEJet.cs b/Source/AJEJet.cs
index 0bc4479..93b0a7b 100644
--- a/Source/AJEJet.cs
+++ b/Source/AJEJet.cs
@@ -7,12 +7,11 @@
 using UnityEngine;
 using System.Reflection;
 using SolverEngines;
-using SolverEngines.EngineFitting;
 
 namespace AJE
 {
 
-    public class ModuleEnginesAJEJet : ModuleEnginesSolver, IModuleInfo, IEngineStatus, IFittableEngine
+    public class ModuleEnginesAJEJet : ModuleEnginesSolver, IModuleInfo, IEngineStatus
     {
         [EngineFitResult]
         [KSPField(isPersistant = false, guiActive = false)]
@@ -269,15 +268,13 @@ public float GetStaticWetNozzleArea()
 
         #region Engine Fitting
 
-        public bool CanFitEngine => true;
-
-        public void PushFitParamsToSolver()
+        public override void PushFitParamsToSolver()
         {
             (engineSolver as SolverJet).SetFitParams(Area, FHV, TAB, minThrottle, turbineAreaRatio);
             PushAreaToInlet();
         }
 
-        public void DoEngineFit()
+        public override void DoEngineFit()
         {
             SolverJet jetEngine = engineSolver as SolverJet;
             jetEngine.FitEngine(dryThrust * 1000d, drySFC, wetThrust * 1000d, idleNPR, defaultTPR : defaultTPR);
@@ -398,6 +395,9 @@ public override string GetInfo()
 
         private void SetStaticSimulation()
         {
+            CreateEngineIfNecessary();
+
+            FitEngineIfNecessary();
             ambientTherm = new EngineThermodynamics();
             ambientTherm.FromStandardConditions(true);
 
diff --git a/Source/Properties/AssemblyInfo.cs b/Source/Properties/AssemblyInfo.cs
index b38b975..f8c74e1 100644
--- a/Source/Properties/AssemblyInfo.cs
+++ b/Source/Properties/AssemblyInfo.cs
@@ -33,7 +33,8 @@
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("2.7.2.0")]
-[assembly: AssemblyFileVersion("2.7.2.0")]
+[assembly: AssemblyVersion("2.7.1.0")]
+[assembly: AssemblyFileVersion("2.7.1.0")]
 
+// Keep this the same
 [assembly: KSPAssemblyDependency("SolverEngines", 2, 1)]