Index: contrib/gis/db/models/fields/__init__.py
===================================================================
--- contrib/gis/db/models/fields/__init__.py    (revision 5178)
+++ contrib/gis/db/models/fields/__init__.py    (working copy)
@@ -64,6 +64,7 @@
         setattr(cls, 'get_%s_wkt' % self.name, curry(cls._get_GEOM_wkt, field=self))
         setattr(cls, 'get_%s_centroid' % self.name, curry(cls._get_GEOM_centroid, field=self))
         setattr(cls, 'get_%s_area' % self.name, curry(cls._get_GEOM_area, field=self))
+        setattr(cls, 'get_%s_convex_hull' % self.name, curry(cls._get_GEOM_convex_hull, field=self))
 
     def get_internal_type(self):
         return "NoField"
Index: contrib/gis/db/models/GeoMixin.py
===================================================================
--- contrib/gis/db/models/GeoMixin.py   (revision 5178)
+++ contrib/gis/db/models/GeoMixin.py   (working copy)
@@ -1,5 +1,5 @@
 # GEOS Routines
-from django.contrib.gis.geos import GEOSGeometry, hex_to_wkt, centroid, area
+from django.contrib.gis.geos import GEOSGeometry, hex_to_wkt, centroid, area, convex_hull
 
 # Until model subclassing is a possibility, a mixin class is used to add
 # the necessary functions that may be contributed for geographic objects.
@@ -27,4 +27,8 @@
         hex = getattr(self, field.attname)
         return area(hex)
 
+    def _get_GEOM_convex_hull(self, field):
+        "Gets the convex hull  of the geometry."
+        hex = getattr(self, field.attname)
+        return convex_hull(hex)
 
Index: contrib/gis/geos/__init__.py
===================================================================
--- contrib/gis/geos/__init__.py        (revision 5178)
+++ contrib/gis/geos/__init__.py        (working copy)
@@ -15,4 +15,7 @@
 def area(input, geom_type='hex'):
     "Returns the area of the geometry (given in HEXEWKB)."
     return GEOSGeometry(input, geom_type).area
-    
+
+def convex_hull(input, geom_type='hex'):
+    "Returns the convex hull of the geometry"
+    return GEOSGeometry(input, geom_type).convex_hull