the demo is here: http://nhatkthanh.no-ip.com/flight.zip when you run it, push down to till the camera up just a tiny bit then push d to speed up. the problem: as you speed up the plane will start to jump around and if you leave it long enough the plane will start to move forward. what I''m trying to accomplish is that the camera right now is moving, and I''m setting the play to be some units in front of the camera. any ideas? thanks.