Originally Posted by
Radical Ryther
I was looking at your pictures and this might be out in left field but I'll bet it has something to do with the rope you are using and its twist. If you can get some ski rope or abseiling rope or any braided rope I'd try experimenting with it.
window sash cord would probably be another one to try.
Braided sash cord works great. I had a new set of vertical blinds installed on my back door took the all the cord out of the old one. The stuff doesn't twist and doesn't turn into a birds nest. I had enough to make the whole rig as well as multiple size loops for different sized airframes. I haven't searched but I wonder of this cord is available from the home center.