--- ../download/airspeed.py	2005-03-01 13:59:46.468954216 +0100
+++ airspeed.py	2005-03-01 14:01:06.904726120 +0100
@@ -371,7 +372,7 @@
             global_namespace = namespace
         value = self.part.calculate(namespace, loader, global_namespace)
         if self.subexpression:
-            value = self.subexpression.calculate(value, loader, namespace)
+            value = self.subexpression.calculate(value, loader, global_namespace)
         return value