Life used to be so easy, you take a bit of wire, run it back to your aileron/rudder/elevator linkage and job done.
On larger models I had noticed people/designers offsetting the horn on the rudders to be more in line with the center of the servo. So I was wondering why they would do such a thing.
I found answers to my questions and many more in a nice spreadsheet created by a fellow who seems to know his business. Here’s the description: Linkage design
Long story short: It’s amazing what forces your humble ailerons etc encounter. Short (extreme) example: 40″ long, 4″ wide aileron deflected to 40 degrees at 100 mph: 75kg/cm on the servohorn!! Could that be the answer to the many, many servo’s needed to move these monsters?? (This particular exercise is for my Carden Extra 330)
My answer is of course that I don’t want to fly at 100 mph, or deflect my aileron 40 degrees, so I can do with a bit less.