I am downloading a drawing program as I write this. Reading about canted bellcranks got me interested in research into model control systems. I currently have a mathematical model that simulates the motion of the entire control system from L/O to bellcrank to flaps to elevator. Every object is allowed to be repositioned in 3d space. The bellcrank plane may be tilted, as well as both horns. The whole thing comprises 46,299 characters and numerous spreadsheets. I keep tweaking it daily.I am 90% of the way through a similar analysis of the Rabe rudder. Only another 90% to go! The ultimate goal would be to find an 'optimum' relationship among the various pieces.