In a message dated 13/11/2006 04:09:31 GMT Standard Time, bones@xxxxxxx writes: Truth is that autopilots in real life are usually custom built around an aircraft so we are doing things in FS that are far more difficult. Trying to build a generic autopilot to fit several aircraft is a much tougher challenge. As you rightly say, testing the combinations for just one aircraft can be daunting on its own - which is why I have been glad my own work is confined to specific aircraft. Thanks for that Bones, as usual you make perfect sense. Frank T.