fix issue 502

to identify quad over mavlink

ArduCopter/system.pde

@@ -205,6 +205,7 @@ static void init_ardupilot()
 
     // identify ourselves correctly with the ground station
 	mavlink_system.sysid = g.sysid_this_mav;
+    mavlink_system.type = 2; //MAV_QUADROTOR;
         
 #if LOGGING_ENABLED == ENABLED
     DataFlash.Init();