You can try tilting a sail in 2-d simulation: http://wry.me/t/gravity/gravity.html http://wry.me/t/gravity/gravity.html (I don't promise I got the light-pressur

You can try tilting a sail in 2-d simulation: http://wry.me/t/gravity/gravity.html http://wry.me/t/gravity/gravity.html (I don't promise I got the light-pressure math right, but it least this shows maneuvering without needing to extend and retract it.)