I fly my ARF Flite Streak with an OS FP 20 on 60 ' lines and it can do all of the OTS manuvers better than I can. I just returned to CL after over 50 years and am using it for a re-trainer. I balance mine pretty tail heavy to get the sharp turns I need for the square manuvers and have gone to a APC 10-3 to slow it down a little and still have good line tension. It is/was very light but now it is heavier since I have had to repair it 3 times (vertical 8's were too low)!
Jim