diff --git a/Aircraft/c172-set.xml b/Aircraft/c172-set.xml
index f234e9e60..22cbed806 100644
--- a/Aircraft/c172-set.xml
+++ b/Aircraft/c172-set.xml
@@ -73,7 +73,7 @@ October 23 2001 John Check, fgpanels@rockfish.net
 
  <engines>
   <engine>
-   <rpm>700</rpm>
+   <rpm type="double">700</rpm>
   </engine>
  </engines>
   
diff --git a/Aircraft/c310u3a-3d-set.xml b/Aircraft/c310u3a-3d-set.xml
index a7e61b5ee..36b9037f6 100644
--- a/Aircraft/c310u3a-3d-set.xml
+++ b/Aircraft/c310u3a-3d-set.xml
@@ -12,6 +12,15 @@ March 2002 Jim Wilson, jimw@kelcomaine.com
 
 <PropertyList>
 
+ <engines>
+  <engine n="0">
+   <rpm type="double">1000</rpm>
+  </engine>
+  <engine n="1">
+   <rpm type="double">1000</rpm>
+  </engine>
+ </engines>
+
  <sim>
   
   <virtual-cockpit archive="y">true</virtual-cockpit>
@@ -99,15 +108,6 @@ March 2002 Jim Wilson, jimw@kelcomaine.com
   <magnetos n="0">3</magnetos>
   <magnetos n="1">3</magnetos>
  </controls>
-
- <engines>
-  <engine n="0">
-   <rpm>1000</rpm>
-  </engine>
-  <engine n="1">
-   <rpm>1000</rpm>
-  </engine>
- </engines>
   
 </PropertyList>
 
@@ -122,3 +122,5 @@ March 2002 Jim Wilson, jimw@kelcomaine.com
 
 
 
+
+