Fixed issue where physically insignificant part mass was not being correctly cascaded down through parent parts.
Fixed issue where physically insignificant part mass was not being correctly cascaded down through parent parts.

--- a/Documents/CHANGES.txt
+++ b/Documents/CHANGES.txt
@@ -1,6 +1,9 @@
-1.0.17.1
+1.0.18.0
+    Added: Orbital readouts - "Speed at Periapsis" and "Speed at Apoapsis". (Padishar)
+    Added: Manoeuvre readouts - "Post-burn Apoapsis" and "Post-burn Periapsis". (Padishar)
     Fixed: Synched the minimum simulation time sliders and stopped them from snapping back after 999ms. (saybur)
     Fixed: Added workaround for the bug in Vessel.horizontalSrfSpeed (Padishar)
+    Fixed: Physically insignificant part masses were not correctly being cascaded down through its parents.
 
 1.0.17.0
     Added: 'Mach Number' readout under the 'Surface' category and included it on the default surface HUD.

--- a/KerbalEngineer/EngineerGlobals.cs
+++ b/KerbalEngineer/EngineerGlobals.cs
@@ -25,7 +25,7 @@
         /// <summary>
         ///     Current version of the Kerbal Engineer assembly.
         /// </summary>
-        public const string ASSEMBLY_VERSION = "1.0.17.0";
+        public const string ASSEMBLY_VERSION = "1.0.18.0";
 
         private static string assemblyFile;
         private static string assemblyName;

--- a/KerbalEngineer/VesselSimulator/Simulation.cs
+++ b/KerbalEngineer/VesselSimulator/Simulation.cs
@@ -30,6 +30,7 @@
 
 namespace KerbalEngineer.VesselSimulator
 {
+    using System.ComponentModel;
     using CompoundParts;
     using Extensions;
     using Helpers;
@@ -675,21 +676,28 @@
             for (int i = 0; i < this.allParts.Count; i++)
             {
                 PartSim part = this.allParts[i];
-                // If the part has a parent
-                if (part.parent != null)
-                {
-                    if (part.isNoPhysics)
-                    {
-                        if (part.parent.isNoPhysics && part.parent.parent != null)
-                        {
-                            part.baseMass = 0d;
-                            part.baseMassForCoM = 0d;
-                        }
-                        else
-                        {
-                            part.parent.baseMassForCoM += part.baseMassForCoM;
-                            part.baseMassForCoM = 0d;
-                        }
+
+                // Check if part should pass it's mass onto its parent.
+                if (part.isNoPhysics && part.parent != null)
+                {
+                    PartSim partParent = part.parent;
+
+                    // Loop through all parents until a physically significant parent is found.
+                    while (partParent != null)
+                    {
+                        // Check if parent is physically significant.
+                        if (partParent.isNoPhysics == false)
+                        {
+                            // Apply the mass to the parent and remove it from the originating part.
+                            partParent.baseMassForCoM += part.baseMassForCoM;
+                            part.baseMassForCoM = 0.0;
+
+                            // Break out of the recursive loop.
+                            break;
+                        }
+
+                        // Recursively loop through the parent parts.
+                        partParent = partParent.parent;
                     }
                 }
             }

 Binary files a/Output/KerbalEngineer/KerbalEngineer.dll and b/Output/KerbalEngineer/KerbalEngineer.dll differ