diff --git a/Aircraft/747-yasim-set.xml b/Aircraft/747-yasim-set.xml
index e7a617f2c..2ed148a8c 100644
--- a/Aircraft/747-yasim-set.xml
+++ b/Aircraft/747-yasim-set.xml
@@ -11,23 +11,26 @@ October 23 2001 John Check, fgpanels@rockfish.net
 -->
 
 <PropertyList>
+ <sim>
 
- <flight-model>yasim</flight-model>
- <aero>747</aero>
- <sound>true</sound>
+  <flight-model>yasim</flight-model>
+  <aero>747</aero>
+  <fuel-fraction>1.0</fuel-fraction>
+  <sound>true</sound>
 
- <panel>
-  <path>Aircraft/c172/Panels/c172-vfr-panel.xml</path>
-  <visibility>true</visibility>
- </panel>
- <panel_2>
-  <path>Aircraft/c172/Panels/c172-trans-mini-panel.xml</path>
- </panel_2>
-  
- <model>
-  <path><!-- you need to set this --></path>
- </model>
+  <panel>
+   <path>Aircraft/c172/Panels/c172-vfr-panel.xml</path>
+   <visibility>true</visibility>
+  </panel>
+  <panel_2>
+   <path>Aircraft/c172/Panels/c172-trans-mini-panel.xml</path>
+  </panel_2>
   
+  <model>
+   <path><!-- you need to set this --></path>
+  </model>
+
+ </sim>
 </PropertyList>
 
 
diff --git a/Aircraft/X15-set.xml b/Aircraft/X15-set.xml
index c74b6a130..193cb6e6d 100644
--- a/Aircraft/X15-set.xml
+++ b/Aircraft/X15-set.xml
@@ -11,30 +11,30 @@ October 23 2001 John Check, fgpanels@rockfish.net
 -->
 
 <PropertyList>
- <!-- these are the three main components -->
+ <sim>
+ 
+  <flight-model>jsb</flight-model>
+  <aero>X15</aero>
+  <sound>false</sound>
 
- <flight-model>jsb</flight-model>
- <aero>X15</aero>
- <sound>false</sound>
-
- <panel>
-  <path>Aircraft/X15/Panels/X15-panel.xml</path>
-  <visibility>true</visibility>
- </panel>
- <panel_2>
-  <path>Aircraft/c172/Panels/c172-trans-mini-panel.xml</path>
- </panel_2>
+  <panel>
+   <path>Aircraft/X15/Panels/X15-panel.xml</path>
+   <visibility>true</visibility>
+  </panel>
+  <panel_2>
+   <path>Aircraft/c172/Panels/c172-trans-mini-panel.xml</path>
+  </panel_2>
   
- <!-- switching models doesn't work -->
- <!-- gear up -->
- <model>
-  <path>Aircraft/X15/Models/X15_flight.ac</path>
- </model> 
- <!-- gear down -->
- <model_2>
-  <path>Aircraft/X15/Models/X15_landing.ac</path>
- </model_2> 
-
+<!-- gear up -->
+  <model>
+   <path>Aircraft/X15/Models/X15_flight.ac</path>
+  </model> 
+<!-- gear down 
+  <model>
+   <path>Aircraft/X15/Models/X15_landing.ac</path>
+  </model_2> 
+-->
+ </sim>
 </PropertyList>
 
 
diff --git a/Aircraft/a4-yasim-set.xml b/Aircraft/a4-yasim-set.xml
index 0dcd02700..243ffdfa6 100644
--- a/Aircraft/a4-yasim-set.xml
+++ b/Aircraft/a4-yasim-set.xml
@@ -11,22 +11,24 @@ October 23 2001 John Check, fgpanels@rockfish.net
 -->
 
 <PropertyList>
+ <sim>
+  <flight-model>yasim</flight-model>
+  <aero>a4</aero>
+  <fuel-fraction>1.0</fuel-fraction>
+  <sound>true</sound>
 
- <flight-model>yasim</flight-model>
- <aero>a4</aero>
- <sound>true</sound>
-
- <panel>
-  <path>Aircraft/c172/Panels/c172-vfr-panel.xml</path>
- </panel>
- <panel_2>
-  <path>Aircraft/c172/Panels/c172-trans-mini-panel.xml</path>
- </panel_2>
+  <panel>
+   <path>Aircraft/c172/Panels/c172-vfr-panel.xml</path>
+  </panel>
+  <panel_2>
+   <path>Aircraft/c172/Panels/c172-trans-mini-panel.xml</path>
+  </panel_2>
   
- <model>
-  <path><!-- you need to set this --></path>
- </model>
-    
+  <model>
+   <path><!-- you need to set this --></path>
+  </model>
+  
+ </sim> 
 </PropertyList>
 
 
diff --git a/Aircraft/c172-ifr-set.xml b/Aircraft/c172-ifr-set.xml
index a7a3f1195..294c485bd 100644
--- a/Aircraft/c172-ifr-set.xml
+++ b/Aircraft/c172-ifr-set.xml
@@ -11,23 +11,25 @@ October 23 2001 John Check, fgpanels@rockfish.net
 -->
 
 <PropertyList>
+ <sim>
+ 
+  <flight-model>jsb</flight-model>
+  <aero>c172</aero>
+  <sound>true</sound>
 
- <flight-model>jsb</flight-model>
- <aero>c172</aero>
- <sound>true</sound>
-
- <panel>
-  <path>Aircraft/c172/Panels/c172-ifr-panel.xml</path>
-  <visibility>true</visibility>
- </panel>
- <panel_2>
-  <path>Aircraft/c172/Panels/c172-trans-mini-panel.xml</path>
- </panel_2>
+  <panel>
+   <path>Aircraft/c172/Panels/c172-ifr-panel.xml</path>
+   <visibility>true</visibility>
+  </panel>
+  <panel_2>
+   <path>Aircraft/c172/Panels/c172-trans-mini-panel.xml</path>
+  </panel_2>
   
- <model>
-  <path><!-- you need to set this --></path>
- </model>
-    
+  <model>
+   <path><!-- you need to set this --></path>
+  </model>
+ 
+ </sim>
 </PropertyList>
 
 
diff --git a/Aircraft/c172-larcsim-set.xml b/Aircraft/c172-larcsim-set.xml
index 811964668..ffff1797c 100644
--- a/Aircraft/c172-larcsim-set.xml
+++ b/Aircraft/c172-larcsim-set.xml
@@ -11,23 +11,25 @@ October 23 2001 John Check, fgpanels@rockfish.net
 -->
 
 <PropertyList>
+ <sim>
+ 
+  <flight-model>larcsim</flight-model>
+  <aero>c172</aero>
+  <sound>true</sound>
 
- <flight-model>larcsim</flight-model>
- <aero>c172</aero>
- <sound>true</sound>
+  <panel>
+   <path>Aircraft/c172/Panels/c172-vfr-panel.xml</path>
+   <visibility>true</visibility>
+  </panel>
+  <panel_2>
+   <path>Aircraft/c172/Panels/c172-trans-mini-panel.xml</path>
+  </panel_2>
 
- <panel>
-  <path>Aircraft/c172/Panels/c172-vfr-panel.xml</path>
-  <visibility>true</visibility>
- </panel>
- <panel_2>
-  <path>Aircraft/c172/Panels/c172-trans-mini-panel.xml</path>
- </panel_2>
-
- <model>
-  <path><!-- you need to set this --></path>
- </model>
-  
+  <model>
+   <path><!-- you need to set this --></path>
+  </model>
+ 
+ </sim>
 </PropertyList>
 
 
diff --git a/Aircraft/c172-set.xml b/Aircraft/c172-set.xml
index 386f0a3fb..3022bc24a 100644
--- a/Aircraft/c172-set.xml
+++ b/Aircraft/c172-set.xml
@@ -11,23 +11,25 @@ October 23 2001 John Check, fgpanels@rockfish.net
 -->
 
 <PropertyList>
+ <sim>
+ 
+  <flight-model>jsb</flight-model>
+  <aero>c172</aero>
+  <sound>true</sound>
 
- <flight-model>jsb</flight-model>
- <aero>c172</aero>
- <sound>true</sound>
-
- <panel>
-  <path>Aircraft/c172/Panels/c172-vfr-panel.xml</path>
+  <panel>
+   <path>Aircraft/c172/Panels/c172-vfr-panel.xml</path>
   <visibility>true</visibility>
- </panel>
- <panel_2>
-  <path>Aircraft/c172/Panels/c172-trans-mini-panel.xml</path>
- </panel_2>
+  </panel>
+  <panel_2>
+   <path>Aircraft/c172/Panels/c172-trans-mini-panel.xml</path>
+  </panel_2>
 
- <model>
-  <path><!-- you need to set this --></path>
- </model>
-    
+  <model>
+   <path><!-- you need to set this --></path>
+  </model>
+  
+ </sim> 
 </PropertyList>
 
 
diff --git a/Aircraft/c172-yasim-set.xml b/Aircraft/c172-yasim-set.xml
index ecc20c7fa..59fdf9d52 100644
--- a/Aircraft/c172-yasim-set.xml
+++ b/Aircraft/c172-yasim-set.xml
@@ -11,23 +11,27 @@ October 23 2001 John Check, fgpanels@rockfish.net
 -->
 
 <PropertyList>
-
- <flight-model>yasim</flight-model>
- <aero>c172</aero>
- <sound>true</sound>
+ <sim>
+ 
+  <flight-model>yasim</flight-model>
+  <aero>c172</aero>
+  <fuel-fraction>1.0</fuel-fraction>
+  <fuel-fraction>1.0</fuel-fraction>
+  <sound>true</sound>
   
- <panel>
-  <path>Aircraft/c172/Panels/c172-vfr-panel.xml</path>
-  <visibility>true</visibility>
- </panel>
- <panel_2>
-  <path>Aircraft/c172/Panels/c172-trans-mini-panel.xml</path>
- </panel_2>
+  <panel>
+   <path>Aircraft/c172/Panels/c172-vfr-panel.xml</path>
+   <visibility>true</visibility>
+  </panel>
+  <panel_2>
+   <path>Aircraft/c172/Panels/c172-trans-mini-panel.xml</path>
+  </panel_2>
 
- <model>
-  <path><!-- you need to set this --></path>
- </model>
-    
+  <model>
+   <path><!-- you need to set this --></path>
+  </model>
+  
+ </sim> 
 </PropertyList>
 
 
diff --git a/Aircraft/c310-set.xml b/Aircraft/c310-set.xml
index 7a231fb22..8a6379c76 100644
--- a/Aircraft/c310-set.xml
+++ b/Aircraft/c310-set.xml
@@ -11,25 +11,26 @@ October 23 2001 John Check, fgpanels@rockfish.net
 -->
 
 <PropertyList>
-<!-- these are the three main components -->
+ <sim>
+  
+  <flight-model>jsb</flight-model>
+  <aero>c310</aero>
+  <sound>true</sound>
 
- <flight-model>jsb</flight-model>
- <aero>c310</aero>
- <sound>true</sound>
-
- <panel>
+  <panel>
   <path>Aircraft/c310/c310-vfr-panel.xml</path>
   <visibility>true</visibility>
- </panel>
- <panel_2>
-  <path>Aircraft/c310/c310-mini-panel.xml</path>
- </panel_2>
+  </panel>
+  <panel_2>
+   <path>Aircraft/c310/c310-mini-panel.xml</path>
+  </panel_2>
  
- <!-- you need to download this model from the site listed above -->
- <model>
-  <path>Aircraft/c310/Models/cessna310r.ac</path>
- </model> 
+  <!-- you can download this model from the site listed above -->
+  <model>
+   <path>Aircraft/c310/Models/cessna310r.ac</path>
+  </model> 
 
+ </sim>
 </PropertyList>
 
 
diff --git a/Aircraft/c310-yasim-set.xml b/Aircraft/c310-yasim-set.xml
index 16a21b84e..d4c828811 100644
--- a/Aircraft/c310-yasim-set.xml
+++ b/Aircraft/c310-yasim-set.xml
@@ -11,25 +11,27 @@ October 23 2001 John Check, fgpanels@rockfish.net
 -->
 
 <PropertyList>
-<!-- these are the three main components -->
+ <sim>
+ 
+  <flight-model>yasim</flight-model>
+  <aero>c310</aero>
+  <fuel-fraction>1.0</fuel-fraction>
+  <sound>true</sound>
 
- <flight-model>yasim</flight-model>
- <aero>c310</aero>
- <sound>true</sound>
+  <panel>
+   <path>Aircraft/c310/c310-vfr-panel.xml</path>
+   <visibility>true</visibility>
+  </panel>
+  <panel_2>
+   <path>Aircraft/c310/c310-mini-panel.xml</path>
+  </panel_2>
 
- <panel>
-  <path>Aircraft/c310/c310-vfr-panel.xml</path>
-  <visibility>true</visibility>
- </panel>
- <panel_2>
-  <path>Aircraft/c310/c310-mini-panel.xml</path>
- </panel_2>
-
- <!-- you need to download this from the above website -->
- <model>
-  <path>Aircraft/c310/Models/cessna310r.ac</path>
- </model> 
+  <!-- you need to download this from the above website -->
+  <model>
+   <path>Aircraft/c310/Models/cessna310r.ac</path>
+  </model> 
 
+ </sim>
 </PropertyList>
 
 
diff --git a/Aircraft/shuttle-set.xml b/Aircraft/shuttle-set.xml
index 990ee7fc7..8588c99a5 100644
--- a/Aircraft/shuttle-set.xml
+++ b/Aircraft/shuttle-set.xml
@@ -11,23 +11,25 @@ October 23 2001 John Check, fgpanels@rockfish.net
 -->
 
 <PropertyList>
+ <sim>
+  
+  <flight-model>jsb</flight-model>
+  <aero>shuttle</aero>
+  <sound>true</sound>
 
- <flight-model>jsb</flight-model>
- <aero>shuttle</aero>
- <sound>true</sound>
-
- <panel>
-  <path>Aircraft/c172/Panels/c172-vfr-panel.xml</path>
-  <visibility>true</visibility>
- </panel>
- <panel_2>
-  <path>Aircraft/c172/Panels/c172-trans-mini-panel.xml</path>
- </panel_2>
-
- <model>
-  <path><!-- you need to set this --></path>
- </model>
+  <panel>
+   <path>Aircraft/c172/Panels/c172-vfr-panel.xml</path>
+   <visibility>true</visibility>
+  </panel>
+  <panel_2>
+   <path>Aircraft/c172/Panels/c172-trans-mini-panel.xml</path>
+  </panel_2>
 
+  <model>
+   <path><!-- you need to set this --></path>
+  </model>
+ 
+ </sim>
 </PropertyList>