RE: Some questions on lines
EF-
I have one model that I had to shorten the lines. It is set up with two insulated lines. Originally they were 60' and I cut them down by about 3'. Just a guess, nothing scientific. That was my first model with electronic control. On subsequent models I only used one insulated line because there is a lot of friction when the insulated lines rub together and I found control to be insensitive. The insulated line does have more drag and will cause the elevator control to go off center. I use the insulated line on the "up" line and set my handle so I have about 1/8th inch down elevator when the handle is neutral.
The FAI scale rules are silent on the issue of line diameter. Anything that will pass the 5 g pull test is OK.
Chuck