I'm retired now Robert so I haven't worked on them for quite a long time but they're a fantastic aircraft. [link=http://www.youtube.com/watch?v=v4ENsDFUlQ0&feature=related]Here's[/link] a youtube video of one putting on a display at an Indy car race at the Gold Coast which is a couple of minutes flying time from the air force base where I worked. Good luck with a model, there was a guy here in Australia who had a turbine powered model with operating swing wings .