Hi Aspeed,
Do I understand you correctly. You took the standard .014" solid control line and anchored it at the end of the outboard wing. Then at the fuselage you attached a horn, which is connected directly to the elevator horn by a pushrod, to the line. You then passed the line through a leadout at the end of the inboard wing. If I am correct, this system doesn't have the transmission ratio that the commercial units have using the helix or the worm gear and only needs a small amount of twist to effect control. This would mean that the line between the anchor at the outboard wingtip and the horn at the fuse. acts like a torque rod wanting to neutralize the control.

If this is the way you provide control, it is very simple and clever.

What is the down-side?
Do you have any data relating to how much twist per foot of line is needed to give you say +/- 30 degrees of "horn-on-the-line" movement on a plane with a 2 foot wingspan?
I ask because this seems like an interesting project to do experiments with the mono-line idea.

What I imagine is that if you don't twist the line to follow the pitch-up or down of the model, the elevator movement would be effected by the pitching action. This brings up a very interesting condition. You could arrange the control setup so that the model would have automatic pitch stability control... when the model pitches down, the elevator goes up... in other words, a mechanical auto-pilot.... Cool!
I wonder why Stanzel didn't use your system.

Please let me know what you think.

Orv.