Try the NASA John H. Glenn Research Center in CLE, <A HREF="http://www.grc.nasa.gov/" TARGET="_blank">http://www.grc.nasa.gov/</A> After Roselawn and Detroit, they did iceing trials using a Twotter. The resulting video is excellent. It covers the various types of ice, severity, pitch and roll upset and recovery and other goodies. If the video is not available from NASA itself, you should be able to borrow it from the UK equivalent of our Regional Aviation Safety Officer.