diff --git a/src/Systems/Makefile.am b/src/Systems/Makefile.am
index 93ff9c946..c40edae4c 100644
--- a/src/Systems/Makefile.am
+++ b/src/Systems/Makefile.am
@@ -5,6 +5,7 @@ libSystems_a_SOURCES = \
                         electrical.cxx electrical.hxx \
                         pitot.cxx pitot.hxx \
                         static.cxx static.hxx \
-                        vacuum.cxx vacuum.hxx
+                        vacuum.cxx vacuum.hxx \
+			submodel.cxx submodel.hxx
 
 INCLUDES = -I$(top_srcdir) -I$(top_srcdir)/src
diff --git a/src/Systems/submodel.cxx b/src/Systems/submodel.cxx
new file mode 100644
index 000000000..a6d04e494
--- /dev/null
+++ b/src/Systems/submodel.cxx
@@ -0,0 +1,100 @@
+// submodel.cxx - models a releasable submodel.
+// Written by Dave Culp, started Aug 2004
+//
+// This file is in the Public Domain and comes with no warranty.
+
+#include "submodel.hxx"
+#include <Main/fg_props.hxx>
+#include <Main/util.hxx>
+#include <AIModel/AIManager.hxx>
+
+
+SubmodelSystem::SubmodelSystem ()
+{
+  firing = false;
+  x_offset = y_offset = 0.0;
+  z_offset = -4.0;
+  pitch_offset = 2.0;
+  yaw_offset = 0.0;
+}
+
+SubmodelSystem::~SubmodelSystem ()
+{
+}
+
+void
+SubmodelSystem::init ()
+{
+    _serviceable_node = fgGetNode("/systems/submodel/serviceable", true);
+    _serviceable_node->setBoolValue(true);
+    _trigger_node = fgGetNode("/systems/submodel/trigger", true);
+    _trigger_node->setBoolValue(false);
+    _amount_node = fgGetNode("/systems/submodel/amount", true);
+    _amount_node->setIntValue(60);
+
+    _user_lat_node = fgGetNode("/position/latitude-deg", true);
+    _user_lon_node = fgGetNode("/position/longitude-deg", true);
+    _user_alt_node = fgGetNode("/position/altitude-ft", true);
+
+    _user_heading_node = fgGetNode("/orientation/heading-deg", true);
+    _user_pitch_node =   fgGetNode("/orientation/pitch-deg", true);
+    _user_roll_node =    fgGetNode("/orientation/roll-deg", true);
+    _user_yaw_node =     fgGetNode("/orientation/yaw-deg", true);
+
+    _user_speed_node = fgGetNode("/velocities/uBody-fps", true);
+
+    elapsed_time = 0.0;
+    initial_velocity = 2750.0;  // feet per second, .50 caliber
+
+    ai = (FGAIManager*)globals->get_subsystem("ai_model");
+}
+
+void
+SubmodelSystem::bind ()
+{
+}
+
+void
+SubmodelSystem::unbind ()
+{
+}
+
+void
+SubmodelSystem::update (double dt)
+{
+  if (_trigger_node->getBoolValue()) {
+    if (_serviceable_node->getBoolValue()) {
+      if (_amount_node->getIntValue() > 0) {
+        firing = true;
+        release(dt);
+      } 
+    }
+  } else {
+    if (firing){
+      firing = false;
+      elapsed_time = 0.0;
+    }
+  }
+}
+
+bool
+SubmodelSystem::release (double dt)
+{
+  // releases a submodel every 0.25 seconds
+  elapsed_time += dt;
+  if (elapsed_time < 0.25) return false;
+  elapsed_time = 0.0;
+
+  int rval = ai->createBallistic( "Models/Geometry/tracer.ac",
+        _user_lat_node->getDoubleValue(),
+        _user_lon_node->getDoubleValue(),
+        _user_alt_node->getDoubleValue() + z_offset,
+        _user_heading_node->getDoubleValue() + yaw_offset,
+        _user_pitch_node->getDoubleValue() + pitch_offset,
+        _user_speed_node->getDoubleValue() + initial_velocity );
+
+  _amount_node->setIntValue( _amount_node->getIntValue() - 1); 
+  return true;                    
+}
+
+// end of submodel.cxx
diff --git a/src/Systems/submodel.hxx b/src/Systems/submodel.hxx
new file mode 100644
index 000000000..3b96ec02e
--- /dev/null
+++ b/src/Systems/submodel.hxx
@@ -0,0 +1,57 @@
+// submodel.hxx - models a releasable submodel.
+// Written by Dave Culp, started Aug 2004
+//
+// This file is in the Public Domain and comes with no warranty.
+
+
+#ifndef __SYSTEMS_SUBMODEL_HXX
+#define __SYSTEMS_SUBMODEL_HXX 1
+
+#ifndef __cplusplus
+# error This library requires C++
+#endif
+
+#include <simgear/props/props.hxx>
+#include <simgear/structure/subsystem_mgr.hxx>
+#include <AIModel/AIManager.hxx>
+
+
+class SubmodelSystem : public SGSubsystem
+{
+
+public:
+
+    SubmodelSystem ();
+    ~SubmodelSystem ();
+
+    void init ();
+    void bind ();
+    void unbind ();
+    void update (double dt);
+    bool release (double dt);
+
+private:
+
+    double x_offset, y_offset, z_offset;
+    double pitch_offset, yaw_offset;
+
+    SGPropertyNode_ptr _serviceable_node;
+    SGPropertyNode_ptr _trigger_node;
+    SGPropertyNode_ptr _amount_node;
+
+    SGPropertyNode_ptr _user_lat_node;
+    SGPropertyNode_ptr _user_lon_node;
+    SGPropertyNode_ptr _user_heading_node;
+    SGPropertyNode_ptr _user_alt_node;
+    SGPropertyNode_ptr _user_pitch_node;
+    SGPropertyNode_ptr _user_roll_node;
+    SGPropertyNode_ptr _user_yaw_node;
+    SGPropertyNode_ptr _user_speed_node;
+
+    double elapsed_time;
+    FGAIManager* ai;
+    double initial_velocity;
+    bool firing;
+};
+
+#endif // __SYSTEMS_SUBMODEL_HXX
diff --git a/src/Systems/system_mgr.cxx b/src/Systems/system_mgr.cxx
index bdf525f14..07639af1e 100644
--- a/src/Systems/system_mgr.cxx
+++ b/src/Systems/system_mgr.cxx
@@ -9,6 +9,7 @@
 #include "pitot.hxx"
 #include "static.hxx"
 #include "vacuum.hxx"
+#include "submodel.hxx"
 
 
 FGSystemMgr::FGSystemMgr ()
@@ -18,6 +19,7 @@ FGSystemMgr::FGSystemMgr ()
     set_subsystem( "static", new StaticSystem );
     set_subsystem( "vacuum-l", new VacuumSystem(0) );
     set_subsystem( "vacuum-r", new VacuumSystem(1) );
+    // set_subsystem( "submodel", new SubmodelSystem() );
 }
 
 FGSystemMgr::~FGSystemMgr ()