I am using Indigo version of ROS and I have searched a lot for converters to convert many xacro extension to urdf but it is of no use because all the projects seem to be very old to be used by indigo or the new gazebo. I have reached a dead end. Can anyone supply a working version of any quadrotor model? I used hectorquadrotor model. you can find this package from : https://github.com/tu-darmstadt-ros-pkg/hectorquadrotor.git

thanks a lot