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/cmd_VEL topic is missing edit

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hi , i have installed (again) Indigo with its default Gazebo as well as Hector_quadrotor [link text](http://wiki.ros.org/hector_quadrotor/Tutorials/Quadrotor%20outdoor%20flight%20demo). I cant find the topic /cmd_vel in order to send a flying command. also , i did install ardrone_autonomy plus tum_simulator and the same situation . here is a list of the topics when launching `roslaunch cvg_sim_gazebo ardrone_testworld.launch ` according to [link text](https://github.com/iolyp/tum-simulator-indigo): rostopic list /aerodynamics/wrench /altimeter /altimeter/parameter_descriptions /altimeter/parameter_updates /clock /command/motor /command/wrench /fix /fix/position/parameter_descriptions /fix/position/parameter_updates /fix/status/parameter_descriptions /fix/status/parameter_updates /fix/velocity/parameter_descriptions /fix/velocity/parameter_updates /fix_velocity /gazebo/link_states /gazebo/model_states /gazebo/parameter_descriptions /gazebo/parameter_updates /gazebo/set_link_state /gazebo/set_model_state /ground_truth/state /joint_states /magnetic /magnetic/parameter_descriptions /magnetic/parameter_updates /motor_pwm /motor_status /pressure_height /propulsion/wrench /quadro/trigger /raw_imu /raw_imu/accel/parameter_descriptions /raw_imu/accel/parameter_updates /raw_imu/bias /raw_imu/rate/parameter_descriptions /raw_imu/rate/parameter_updates /raw_imu/yaw/parameter_descriptions /raw_imu/yaw/parameter_updates /rosout /rosout_agg /sonar_height /sonar_height/parameter_descriptions /sonar_height/parameter_updates /supply /tf /tf_static /wind had anyone seen such a thing before ? ps: i think in both cases i saw the same topics (hector and ardrone). thanks in advance

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