diff --git a/User Manual/changelog.html b/User Manual/changelog.html
index 2266e3c7ce66ea76a4215b842acddd88e3660cad..e25e9e556b990ed77ae12c88469507994c05f566 100644
--- a/User Manual/changelog.html	
+++ b/User Manual/changelog.html	
@@ -16,7 +16,7 @@ Manual</span></a><span style="color: rgb(0, 0, 0); font-family: 'Times New Roman
 <div style="text-align: center;"><img style="width: 536px; height: 209px;" alt="VECTO" src="pics/VECTOlarge.png" vspace="10"><br>
 <br>
 <span style="font-family: Verdana;"><big><big><big><span style="font-weight: bold;">Changelog</span></big></big></big><br><br style="font-family: Verdana;"></span>
-<hr style="width: 100%; height: 2px;"><div style="text-align: left;"><span style="font-family: Tahoma;">VECTO 1.3</span><br><span style="font-family: Tahoma;"></span></div><ul style="text-align: left;"><li><span style="font-family: Tahoma;">Some file-specific error messages link to files</span></li><li><span style="font-family: Tahoma;">Eco-Roll, Overspeed, Look Ahead Coasting</span></li></ul><div style="text-align: left;"><span style="font-family: Tahoma;"></span><span style="font-family: Tahoma;">VECTO 1.2</span><span style="font-family: Tahoma;"> - </span><span style="font-family: Tahoma;">08.04.2013</span><br><span style="font-family: Tahoma;"></span></div><ul style="text-align: left;"><li><span style="font-family: Tahoma;">Engine Start/Stop implemented</span></li><li><span style="font-family: Tahoma;">Bugfix: Fixed error in FC interpolation (invalid extrapolation errors)</span></li><li><span style="font-family: Tahoma;">FC Extrapolation will abort the calculation</span></li><li><span style="font-family: Tahoma;">Transmission Type selection in Gearbox (.vgbx) file.</span></li><ul><li><span style="font-family: Tahoma;">Enables/Disables transmission type-specific options </span></li></ul><ul><li><span style="font-family: Tahoma;">In Proof-Of-Concept mode "Custom" type is available with all options enabled.</span></li></ul><li><span style="font-family: Tahoma;">Automatic Transmission mode with Torque converter: Input parameters in Gearbox file !!still being tested!!</span></li><li><span style="font-family: Tahoma;">Option to open files with GRAPHi or user-defined tool</span></li><li><span style="font-family: Tahoma;">User Manual updated</span></li><li><span style="font-family: Tahoma;">Bugfix: Files with relative paths were not located correctly</span></li><li><span style="font-family: Tahoma;">Corrected comment line for wheels inertia and axle config in .vveh file</span></li><li><span style="font-family: Tahoma;">Changed RRC unit in GUI from [-] to [N/N]</span></li><li><span style="font-family: Tahoma;">Tranmission Loss Maps are not converted to n,Pe-Maps anymore. Should fix non-linear interpolation effects.</span></li><li><span style="font-family: Tahoma;">Engine Only Mode</span></li></ul><div style="text-align: left;"><span style="font-family: Tahoma;">VECTO 1.1 - </span><span style="font-family: Tahoma;">06.02.2013</span><br><span style="font-family: Tahoma;"></span></div><ul style="text-align: left;"><li><span style="font-family: Tahoma;">Speed values below 0.09km/h are set to 0km/h</span></li><li><span style="font-family: Tahoma;">New gear shift model</span></li><ul><li><span style="font-family: Tahoma;">Replaces old gear shift model!</span></li></ul><ul><li><span style="font-family: Tahoma;">New parameters in .vgbx file including path to gear shift polygons file</span></li></ul><ul><li><span style="font-family: Tahoma;">Old gear shift model parameters removed from .vecto file</span></li></ul><li><span style="font-family: Tahoma;">Command Line Arguments processing (see User Manual):</span></li><ul><li><span style="font-family: Tahoma;">Changed prefix form "/" to "-"</span></li></ul><ul><li><span style="font-family: Tahoma;">Bugfix: Argument "-run" was not processed</span></li></ul><ul><li><span style="font-family: Tahoma;">Job files and driving cycles can be added via command line</span></li></ul><ul><li><span style="font-family: Tahoma;">Files without path are expected in the Working Directory</span></li></ul><li><span style="font-family: Tahoma;">User Manual update for command line arguments</span></li><li><span style="font-family: Tahoma;">Various fixes in GUI</span></li><li><span style="font-family: Tahoma;">Bugfix: Error in Cycle Conversion (distance- to time-based) when using Aux Power Input.</span></li><li><span style="font-family: Tahoma;">Distance Correction is now active only in acceleration and cruise phases.</span></li><li><span style="font-family: Tahoma;">Fixed cycles starting with vehicle speed = 0. In V1.0 the first and second time step were averaged to speed values &gt; 0.</span></li><li><span style="font-family: Tahoma;">Demo data updated for new gear shift model</span></li><li><span style="font-family: Tahoma;">New independent licensing dll replaces TUG's version</span></li></ul><div style="text-align: left;"><span style="font-family: Tahoma;"></span><br><span style="font-family: Tahoma;"></span></div><span style="font-family: Tahoma;"><br></span>
+<hr style="width: 100%; height: 2px;"><div style="text-align: left;"><span style="font-family: Tahoma;">VECTO 1.3.1.1<br></span><ul><li><span style="font-family: Tahoma;">Fixed error in power calculation (rotatory part of acceleration force)</span></li></ul><span style="font-family: Tahoma;"></span><span style="font-family: Tahoma;">VECTO 1.3.1<br></span><ul><li><span style="font-family: Tahoma;">Fixed assembly information</span></li></ul><span style="font-family: Tahoma;">VECTO 1.3</span><br><span style="font-family: Tahoma;"></span></div><ul style="text-align: left;"><li><span style="font-family: Tahoma;">Some file-specific error messages link to files</span></li><li><span style="font-family: Tahoma;">Eco-Roll, Overspeed, Look Ahead Coasting</span></li></ul><div style="text-align: left;"><span style="font-family: Tahoma;"></span><span style="font-family: Tahoma;">VECTO 1.2</span><br><span style="font-family: Tahoma;"></span></div><ul style="text-align: left;"><li><span style="font-family: Tahoma;">Engine Start/Stop implemented</span></li><li><span style="font-family: Tahoma;">Bugfix: Fixed error in FC interpolation (invalid extrapolation errors)</span></li><li><span style="font-family: Tahoma;">FC Extrapolation will abort the calculation</span></li><li><span style="font-family: Tahoma;">Transmission Type selection in Gearbox (.vgbx) file.</span></li><ul><li><span style="font-family: Tahoma;">Enables/Disables transmission type-specific options </span></li></ul><ul><li><span style="font-family: Tahoma;">In Proof-Of-Concept mode "Custom" type is available with all options enabled.</span></li></ul><li><span style="font-family: Tahoma;">Automatic Transmission mode with Torque converter: Input parameters in Gearbox file !!still being tested!!</span></li><li><span style="font-family: Tahoma;">Option to open files with GRAPHi or user-defined tool</span></li><li><span style="font-family: Tahoma;">User Manual updated</span></li><li><span style="font-family: Tahoma;">Bugfix: Files with relative paths were not located correctly</span></li><li><span style="font-family: Tahoma;">Corrected comment line for wheels inertia and axle config in .vveh file</span></li><li><span style="font-family: Tahoma;">Changed RRC unit in GUI from [-] to [N/N]</span></li><li><span style="font-family: Tahoma;">Tranmission Loss Maps are not converted to n,Pe-Maps anymore. Should fix non-linear interpolation effects.</span></li><li><span style="font-family: Tahoma;">Engine Only Mode</span></li></ul><div style="text-align: left;"><span style="font-family: Tahoma;">VECTO 1.1</span><br><span style="font-family: Tahoma;"></span></div><ul style="text-align: left;"><li><span style="font-family: Tahoma;">Speed values below 0.09km/h are set to 0km/h</span></li><li><span style="font-family: Tahoma;">New gear shift model</span></li><ul><li><span style="font-family: Tahoma;">Replaces old gear shift model!</span></li></ul><ul><li><span style="font-family: Tahoma;">New parameters in .vgbx file including path to gear shift polygons file</span></li></ul><ul><li><span style="font-family: Tahoma;">Old gear shift model parameters removed from .vecto file</span></li></ul><li><span style="font-family: Tahoma;">Command Line Arguments processing (see User Manual):</span></li><ul><li><span style="font-family: Tahoma;">Changed prefix form "/" to "-"</span></li></ul><ul><li><span style="font-family: Tahoma;">Bugfix: Argument "-run" was not processed</span></li></ul><ul><li><span style="font-family: Tahoma;">Job files and driving cycles can be added via command line</span></li></ul><ul><li><span style="font-family: Tahoma;">Files without path are expected in the Working Directory</span></li></ul><li><span style="font-family: Tahoma;">User Manual update for command line arguments</span></li><li><span style="font-family: Tahoma;">Various fixes in GUI</span></li><li><span style="font-family: Tahoma;">Bugfix: Error in Cycle Conversion (distance- to time-based) when using Aux Power Input.</span></li><li><span style="font-family: Tahoma;">Distance Correction is now active only in acceleration and cruise phases.</span></li><li><span style="font-family: Tahoma;">Fixed cycles starting with vehicle speed = 0. In V1.0 the first and second time step were averaged to speed values &gt; 0.</span></li><li><span style="font-family: Tahoma;">Demo data updated for new gear shift model</span></li><li><span style="font-family: Tahoma;">New independent licensing dll replaces TUG's version</span></li></ul><div style="text-align: left;"><span style="font-family: Tahoma;"></span><br><span style="font-family: Tahoma;"></span></div><span style="font-family: Tahoma;"><br></span>
 <br>
 <br>
 <div style="text-align: left;"><span style="font-family: Calibri;"></span>
diff --git a/VECTO Changelog.txt b/VECTO Changelog.txt
index caf09ab7dd8b0bdcdd3d6774e51ee1af514c7848..d60c45588956c67bd0b406f1ecac818372d493ed 100644
--- a/VECTO Changelog.txt	
+++ b/VECTO Changelog.txt	
@@ -1,12 +1,17 @@
 VECTO ?.? (future release)
-- Gearbox Rules must be set when loading .gbx file to aviod invalid settings (e.g. AT with Skip Gears)
+- Rollout Speed: PvD + PlossDiff must be Zero, not Pwheel?!
+- roll coefficient as function of relative axle load?
 - Eaux	[kWh] for all single auxiliaries.
 - User Manual: Don't use secondary retarder if retarder losses are already defined in transmission loss maps
-
+- Gearbox Rules must be set when loading .gbx file to aviod invalid settings (e.g. AT with Skip Gears)
+- Correct Pg and Proll calculation (Road gradient)??
+- Stop/Start not working if Paux>0 => correct User Manual or Code?
 
 VECTO x.x (current source - next release)
 
 
+VECTO 1.3.1.1
+- Fixed error in power calculation (rotatory part of acceleration force)
 
 VECTO 1.3.1
 - Fixed assembly information
diff --git a/VECTO/Input Files/cVEH.vb b/VECTO/Input Files/cVEH.vb
index 1fe83e6d5d2630dc1ee4aded21d898a3c6e204d6..b71b30265cae8ed6764ef0108b0cea84548516b0 100644
--- a/VECTO/Input Files/cVEH.vb	
+++ b/VECTO/Input Files/cVEH.vb	
@@ -1206,7 +1206,7 @@ lbInt:
 
     Public ReadOnly Property m_raeder_red As Single
         Get
-            Return siI_wheels / (siDreifen ^ 2)
+            Return siI_wheels / ((siDreifen / 2) ^ 2)
         End Get    
     End Property
 
diff --git a/VECTO/My Project/AssemblyInfo.vb b/VECTO/My Project/AssemblyInfo.vb
index c6e66773e70e672edc9ea3991a9fb0db72bd43b0..435d327fdb28f2a117ac5b34e67d571343387533 100644
--- a/VECTO/My Project/AssemblyInfo.vb	
+++ b/VECTO/My Project/AssemblyInfo.vb	
@@ -31,5 +31,5 @@ Imports System.Runtime.InteropServices
 ' by entering "*" in them:
 ' <Assembly: AssemblyVersion("1.0.*")> 
 
-<Assembly: AssemblyVersion("1.3.1.0")> 
-<Assembly: AssemblyFileVersion("1.3.1.0")> 
+<Assembly: AssemblyVersion("1.3.1.1")> 
+<Assembly: AssemblyFileVersion("1.3.1.1")> 
diff --git a/VECTO/VECTO_Global.vb b/VECTO/VECTO_Global.vb
index ce051408386dc8214118d9f912d75cf94082f4ea..7f42761e05c342327983198d6c11b8a5c7fe0d8d 100644
--- a/VECTO/VECTO_Global.vb
+++ b/VECTO/VECTO_Global.vb
@@ -2,7 +2,7 @@
 
 Module VECTO_Global
 
-    Public Const VECTOvers As String = "1.3.1"
+    Public Const VECTOvers As String = "1.3.1.1"
     Public MyAppPath As String
     Public MyConfPath As String
     Public MyDeclPath As String