Alex Weiss has been aeromodelling for half a century and has built more than fifty radio-controlled models of which 28 were original designs and 14 were published in RCM&E or Radio Modeller magazines. As well as monoplanes and a biplane, the list includes an autogyro, canards and deltas. He has also written magazine articles on subjects as diverse as four stroke engines and flutter. The author first went solo in a Chipmunk with his University Air Squadron at Tangmere and his early adult life was spent as an RAF pilot, flying Jet Provosts, Vampires and Hunters, including three years as a qualified flying instructor. Much of his professional experience has been dedicated to the complex subject of teaching people to fly radio controlled models. Jon Barden, a College Lecturer in Electrical Installations, has over 20 years experience in training staff in electrical and mechanical engineering. He has also been involved with the training and assessment of students on City and Guilds courses.