Hello to RTP fans. I have just discovered this thread and I am pleased to see that RTP is still alive and well. I developed an interest in the system years ago, especially as a means of introducing school children to model flying. I have also noticed that an ancient article of mine on the topic also remains on the web: http://www.ctie.monash.edu.au/hargrave/mccarthy_rtp.html This is sadly in need of revision and updating, but some of the ideas worked well back then, especially the use of simple cardboard models as a way of demonstrating the basic setting up of an aircraft: CG; wing and tailplane incidences; wing loading; simple aerofoil effects; control surface effects, etc. All of these could be implemented and the outcomes immediately made apparent! With every group I would have the model scurrying around on the floor (lots of jeers) then stop it, tweak the elevators, and up she would go to gasps of amazement. Getting small groups of students engaged quickly in building a cardboard model and flying it was a plus for this approach to RTP. Jono's comment on 11/8 brought back unpleasant memories: "The lacquered wire is an issue although careful storage makes a difference." I recall trying to solder the stuff in the middle of a session - it was always kinking and breaking. I found that a cheap alternative was a pair of wires stripped from grey comptuer linking cable. They were somewhat heavier of course but as they were joined as a single unit the air resistance was probably about the same. Good luck with RTP.Peter